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1991 Ford Mustang Spark Plug

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NGK Spark Plug
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(Read reviews)
Our List Price: $4.83
(99) In Stock
Part Number: 5478-09083083
Notes: G-Power Spark Plug -- Dual Plug; 8 Required; Gap 0.044"
Condition: New

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This Part Fits: Catalog: H
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

NGK Spark Plug
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(Read reviews)
Our List Price: $4.83
(53) In Stock
Part Number: 5478-09083087
Notes: G-Power Spark Plug -- Gap 0.054"
Condition: New

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Ground
This Part Fits: Catalog: H
Vehicle Engine
1991 Ford Mustang 5.0L V8 

NGK Spark Plug
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(Read reviews)
Our List Price: $9.18
(99) In Stock
Part Number: 5478-05051270
Notes: Iridium IX Spark Plug -- Dual Plug; 8 Required; Gap 0.044"
Condition: New

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Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

NGK Spark Plug
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(Read reviews)
Our List Price: $9.18
(24) In Stock
Part Number: 5478-05292023
Notes: Iridium IX Spark Plug -- Gap 0.054"
Condition: New

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Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 

NGK Spark Plug
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(Read reviews)
Our List Price: $13.18
(2) In Stock
Part Number: 5478-05124366
Notes: Laser Iridium Spark Plug -- .044
Condition: New

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Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

NGK Spark Plug
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(1 Reviews)
5 Stars
NGK 97287
Spark Plug
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Our List Price: $12.83
(28) In Stock
Part Number: 5478-09134488
Notes: Laser Iridium Spark Plug -- Dual Plug; 8 Required; Gap 0.044"
Condition: New

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Ground
This Part Fits: Catalog: H
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

NGK Spark Plug
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(1 Reviews)
5 Stars
NGK 3784
Spark Plug
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Our List Price: $10.83
(36) In Stock
Part Number: 5478-09083131
Notes: Laser Platinum Spark Plug -- Dual Plug; 8 Required; Gap 0.044"
Condition: New

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Ground
This Part Fits: Catalog: H
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

NGK Spark Plug

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(1 Reviews)
5 Stars
NGK 2238
Spark Plug
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Our List Price: $2.98
(50) In Stock
Part Number: 5478-03343874
Notes: V-Power Spark Plug -- Dual Plug; 8 Required; Gap 0.044"; OE Equivalent Design
Condition: New

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Ground
This Part Fits: Catalog: F
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

NGK Spark Plug

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(Read reviews)
Our List Price: $2.98
(50) In Stock
Part Number: 5478-03344075
Notes: V-Power Spark Plug -- Gap 0.054"
Condition: New

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Ground
This Part Fits: Catalog: F
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Bosch Spark Plug
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(1 Reviews)
5 Stars
Bosch 7971
Spark Plug
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Our List Price: $4.18
(99) In Stock
Part Number: 5478-05212362
Notes: Nickel -- Gap 0.044 in; Original equipment is nickel; with Dual Spark Plugs
Features:
  • Heavy-duty yttrium enhanced nickel-copper center electrode ensures superior reliability and durability for up to 50% longer performance life vs. standard copper plugs
  • Copper core provides broader heat range to resist pre-ignition and fouling
  • Nickel-plated rolled threads provide superior resistance to corrosion and do not require anti-seize - saving time
  • Angled, ribbed insulator design prevents misfire due to flash-over
  • Metal glass fused resistor maximizes interference suppression
  • Bosch Super Plus, with a heavy-duty yttrium-enhanced copper core center electrode, is the longest lasting copper core spark plug on the market.
Condition: New

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Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Bosch Spark Plug
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(Read reviews)
Our List Price: $8.18
(99) In Stock
Part Number: 5478-05252116
Notes: OE Fine Wire Double Iridium -- Do Not Gap, Gap is Preset; Original equipment is nickel
Features:
  • Double Iridium electrodes - iridium firing pin and iridium ground electrode inlay offer higher performance and 4 times longer life compared to standard copper spark plugs
  • OE Fine Wire design requires up to 24% less voltage to ignite
  • 360 degree continuous laser welding increases durability for increased life
  • Copper core provides broader heat range to resist pre-ignition and fouling
  • Pre-gapped and nickel plated threads allow for quick installation without adjusting the gap or applying anti-seize
  • Tapered ground electrode allows for better ignition throughout the life of the spark plug
  • Bosch OE Fine Wire Iridium. The only iridium spark plug line engineered for both High Performance and Long Life.
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Bosch Spark Plug
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(4 Reviews)
4.5 Stars
Bosch 9606
Spark Plug
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Our List Price: $8.18
(99) In Stock
Part Number: 5478-05250276
Notes: OE Fine Wire Double Iridium -- Do Not Gap, Gap is Preset; Original equipment is nickel; with Dual Spark Plugs
Features:
  • Double Iridium electrodes - iridium firing pin and iridium ground electrode inlay offer higher performance and 4 times longer life compared to standard copper spark plugs
  • OE Fine Wire design requires up to 24% less voltage to ignite
  • 360 degree continuous laser welding increases durability for increased life
  • Copper core provides broader heat range to resist pre-ignition and fouling
  • Pre-gapped and nickel plated threads allow for quick installation without adjusting the gap or applying anti-seize
  • Tapered ground electrode allows for better ignition throughout the life of the spark plug
  • Bosch OE Fine Wire Iridium. The only iridium spark plug line engineered for both High Performance and Long Life.
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Bosch Spark Plug
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(Read reviews)
Our List Price: $6.83
(35) In Stock
Part Number: 5478-09021065
Notes: OE Fine Wire Double Platinum -- Do Not Gap, Gap is Preset; Original equipment is nickel; with Dual Spark Plugs
Features:
  • Platinum on the center electrode pin and laser welded platinum inlay ground electrode provide three times longer life than conventional copper spark plugs
  • OE Fine Wire design requires up to 24% less voltage to ignite
  • 360 degree continuous laser welding increases durability for increased life
  • Copper core provides broader heat range to resist pre-ignition and fouling
  • Pre-gapped and nickel plated threads allow for quick installation without adjusting the gap or applying anti-seize
  • BOSCH OE Fine Wire Double Platinum utilize a platinum tip on both the center and ground electrodes to provide Long Life
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: H
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Bosch Spark Plug
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(Read reviews)
Our List Price: $5.18
(99) In Stock
Part Number: 5478-05252090
Notes: OE Fine Wire Platinum -- Do Not Gap, Gap is Preset; Original equipment is nickel
Features:
  • OE Fine Wire design requires up to 24% less voltage to ignite
  • Pre-gapped and nickel plated threads allow for quick installation without adjusting the gap or applying anti-seize
  • Tapered ground electrode allows for better ignition throughout the life of the spark plug
  • BOSCH OE Fine Wire Platinum deliver improved ignitability and fuel efficiency, and are an economical upgrade from conventional copper core spark plugs
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Bosch Spark Plug
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(Read reviews)
Our List Price: $5.18
(99) In Stock
Part Number: 5478-05638779
Notes: OE Fine Wire Platinum -- Do Not Gap, Gap is Preset; Original equipment is nickel; with Dual Spark Plugs
Features:
  • OE Fine Wire design requires up to 24% less voltage to ignite
  • Pre-gapped and nickel plated threads allow for quick installation without adjusting the gap or applying anti-seize
  • Tapered ground electrode allows for better ignition throughout the life of the spark plug
  • BOSCH OE Fine Wire Platinum deliver improved ignitability and fuel efficiency, and are an economical upgrade from conventional copper core spark plugs
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Bosch Spark Plug
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Our List Price: $3.18
(24) In Stock
Part Number: 5478-05120679
Notes: PLATINUM
Condition: New

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Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 VIN: E 

Bosch Spark Plug
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Our List Price: $5.83
(3) In Stock
Part Number: 5478-09020456
Notes: Platinum Plus -- Gap 0.054 in
Condition: New

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Ground
This Part Fits: Catalog: H
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Bosch Spark Plug
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(2 Reviews)
5 Stars
Bosch 4458
Spark Plug
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Our List Price: $7.18
(99) In Stock
Part Number: 5478-05021003
Notes: Platinum+4 -- Do Not Gap, Gap is Preset
Features:
  • Revolutionary surface air gap firing technology featuring four yttrium-enhanced ground electrodes delivers the longest, most powerful spark for ultimate engine performance
  • Four yttrium-enhanced ground electrodes provide optimum access to the air/fuel mixture for the most efficient combustion, plus the yttrium alloy ground electrodes reduce gap wear and oxidation for extended performance life
  • Electrode gap is factory set to provide ease of installation - never requires adjustment
  • Never requires gapping,the electrode gap is factory-set and never requires adjustment
  • Provides ease of installation - never requires adjustment
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Bosch Spark Plug
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Our List Price: $3.18
(6) In Stock
Part Number: 5478-05244466
Notes: SUPER
Condition: New

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Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 VIN: E 

AC Delco Spark Plug
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Our List Price: $3.83
(99) In Stock
Part Number: 5478-09006498
Notes: Professional Conventional -- New; Gap .044 Requires 2 plugs per cylinder
Condition: New

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This Part Fits: Catalog: H
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

AC Delco Spark Plug
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(1 Reviews)
5 Stars
AC Delco CR43TS
Spark Plug
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Our List Price: $3.83
(99) In Stock
Part Number: 5478-09006491
Notes: Professional Conventional -- New; Gap .054
Condition: New

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Ground
This Part Fits: Catalog: H
Vehicle Engine
1991 Ford Mustang 5.0L V8 

AC Delco Spark Plug
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(Read reviews)
Our List Price: $8.83
(15) In Stock
Part Number: 5478-09006452
Notes: Professional Double Platinum -- New; 2 PLUGS/CYLINDER; Gap .044
Condition: New

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This Part Fits: Catalog: H
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

AC Delco Spark Plug
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Our List Price: $8.83
(18) In Stock
Part Number: 5478-09006455
Notes: Professional Double Platinum -- New; Gap .054
Condition: New

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Ground
This Part Fits: Catalog: H
Vehicle Engine
1991 Ford Mustang 5.0L V8 

AC Delco Spark Plug
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(1 Reviews)
5 Stars
AC Delco 12
Spark Plug
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Our List Price: $6.18
(99) In Stock
Part Number: 5478-05005375
Notes: Professional RAPIDFIRE -- New; 2 PLUGS/CYLINDER; Gap .044
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

AC Delco Spark Plug
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(Read reviews)
Our List Price: $6.18
(99) In Stock
Part Number: 5478-05005918
Notes: Professional RAPIDFIRE -- New; Gap .054
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Autolite Spark Plug
Our List Price: $2.98
(50) In Stock
Part Number: 5478-03651098
Notes: Copper Resistor Spark Plug -- .044" / 1.1mm; OE Style; with Dual Spark Plugs; OE half thread design replaced by full thread design
Features:
  • AutoliteCopper Core plugs are designed to meet or exceed OES design requirements.
Condition: New

Center Electrode Core Copper
Center Electrode Tip Material Nickel
Ground Electrode Tip Material Nickel

Shipping Options:
Ground
This Part Fits: Catalog: F
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Autolite Spark Plug
Our List Price: $2.98
(50) In Stock
Part Number: 5478-03651030
Notes: Copper Resistor Spark Plug -- .044" / 1.1mm; Replaces OE Half Thread Design; with Dual Spark Plugs; OE Style
Features:
  • AutoliteCopper Core plugs are designed to meet or exceed OES design requirements.
Condition: New

Center Electrode Core Copper
Center Electrode Tip Material Copper
Ground Electrode Tip Material Copper

Shipping Options:
Ground
This Part Fits: Catalog: F
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Autolite Spark Plug
Our List Price: $2.98
(50) In Stock
Part Number: 5478-03651039
Notes: Copper Resistor Spark Plug -- .054" / 1.4mm; OE Style
Features:
  • AutoliteCopper Core plugs are designed to meet or exceed OES design requirements.
Condition: New

Center Electrode Core Copper
Center Electrode Tip Material Nickel
Ground Electrode Tip Material Nickel

Shipping Options:
Ground
This Part Fits: Catalog: F
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Autolite Spark Plug
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(Read reviews)
Our List Price: $6.83
(99) In Stock
Part Number: 5478-09183049
Notes: Double Platinum Spark Plug -- .044"/1.1mm; with Dual Spark Plugs; Replaces OE Half Thread Design
Features:
  • Autolite Double Platinum plugs feature platinum-to-platinum firing which virtually eliminates gap erosion, reduces misfires and increases durability of the plug.
Condition: New

Center Electrode Core Copper
Center Electrode Tip Material Platinum
Ground Electrode Tip Material Platinum

Shipping Options:
Ground
This Part Fits: Catalog: H
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Autolite Spark Plug
Our List Price: $5.98
(50) In Stock
Part Number: 5478-03651142
Notes: Double Platinum Spark Plug -- .054" / 1.4mm
Features:
  • Autolite Double Platinum plugs feature platinum-to-platinum firing which virtually eliminates gap erosion, reduces misfires and increases durability of the plug.
Condition: New

Center Electrode Core Copper
Center Electrode Tip Material Platinum
Ground Electrode Tip Material Platinum

Shipping Options:
Ground
This Part Fits: Catalog: F
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Autolite Spark Plug
Our List Price: $6.98
(50) In Stock
Part Number: 5478-03651173
Notes: Iridium Spark Plug -- .044" / 1.1mm; Replaces OE Half Thread Design; with Dual Spark Plugs; Iridium Enhanced Center Electrode. Proprietary V-trimmed Platinum side wire. 0.6mm finewire design.
Features:
  • Our best spark plug! Autolite Iridium XP spark plugs feature an iridium-enhanced 0.6mm finewire design and patented platinum sidewire technology to provide better overall durability and a more focused ignition.
Condition: New

Center Electrode Core Copper
Center Electrode Tip Material Iridium
Ground Electrode Tip Material Platinum

Shipping Options:
Ground
This Part Fits: Catalog: F
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Autolite Spark Plug
Our List Price: $6.98
(50) In Stock
Part Number: 5478-03651176
Notes: Iridium Spark Plug -- .054" / 1.4mm; Iridium Enhanced Center Electrode. Proprietary V-trimmed Platinum side wire. 0.6mm finewire design.
Features:
  • Our best spark plug! Autolite Iridium XP spark plugs feature an iridium-enhanced 0.6mm finewire design and patented platinum sidewire technology to provide better overall durability and a more focused ignition.
Condition: New

Center Electrode Core Copper
Center Electrode Tip Material Iridium
Ground Electrode Tip Material Platinum

Shipping Options:
Ground
This Part Fits: Catalog: F
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Autolite Spark Plug
Our List Price: $3.98
(50) In Stock
Part Number: 5478-03651106
Notes: Platinum Spark Plug -- .044" / 1.1mm; with Dual Spark Plugs; Replaces OE Half Thread Design
Features:
  • Autolite Platinum plugs provide a center wire platinum firing tip which provides reduced gap erosion, fewer misfires, better performance and increased durability.
Condition: New

Center Electrode Core Copper
Center Electrode Tip Material Platinum
Ground Electrode Tip Material Nickel

Shipping Options:
Ground
This Part Fits: Catalog: F
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Autolite Spark Plug
Our List Price: $3.98
(44) In Stock
Part Number: 5478-03651111
Notes: Platinum Spark Plug -- .054" / 1.4mm
Features:
  • Autolite Platinum plugs provide a center wire platinum firing tip which provides reduced gap erosion, fewer misfires, better performance and increased durability.
Condition: New

Center Electrode Core Copper
Center Electrode Tip Material Platinum
Ground Electrode Tip Material Nickel

Shipping Options:
Ground
This Part Fits: Catalog: F
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Motorcraft Spark Plug
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(Read reviews)
Product List Price:
$5.08
Our List Price: $4.58
(23) In Stock
Part Number: W0133-1953823
Notes: OE Copper Core
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
OEM
This Part Fits: Catalog: A
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Motorcraft Spark Plug
Click to Enlarge
(Read reviews)
Product List Price:
$5.08
Our List Price: $4.58
(30) In Stock
Part Number: W0133-1857686
Notes: OE Copper Core
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
OEM
This Part Fits: Catalog: A
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Motorcraft Spark Plug
Image is not vehicle specific
(Read reviews)
Product List Price:
$5.08
Our List Price: $4.58
(99) In Stock
Part Number: W0133-2762320
Notes: OE Copper Core
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
OEM
This Part Fits: Catalog: A
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Motorcraft Spark Plug
Click to Enlarge
(Read reviews)
Product List Price:
$5.08
Our List Price: $4.58
(99) In Stock
Part Number: W0133-2621753
Notes: OE Copper Core
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
OEM
This Part Fits: Catalog: A
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Motorcraft Spark Plug
Click to Enlarge
(Read reviews)
Our List Price: $4.18
(99) In Stock
Part Number: 5478-05048451
Notes: Spark Plug -- Plug Material: Copper; Dual Plug; Gap: .044; -447-A; Type - Standard Service Plug
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl VIN: M 

Motorcraft Spark Plug
Image is not vehicle specific
(Read reviews)
Our List Price: $4.18
(99) In Stock
Part Number: 5478-05701241
Notes: Spark Plug -- Plug Material: Copper; Dual Plug; Gap: .044; -447; Type - Standard Service Plug
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl VIN: M 

Motorcraft Spark Plug
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(1 Reviews)
5 Stars
Motorcraft SP-450
Spark Plug
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Our List Price: $4.18
(8) In Stock
Part Number: 5478-05048453
Notes: Spark Plug -- Plug Material: Copper; Gap: .054; -450-A; Type - Standard Service Plug
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 VIN: E 

Motorcraft Spark Plug
Image is not vehicle specific
(Read reviews)
Our List Price: $4.18
(99) In Stock
Part Number: 5478-05683961
Notes: Spark Plug -- Plug Material: Copper; Gap: .054; -450; Type - Standard Service Plug
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 VIN: E 

Motorcraft Spark Plug
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(2 Reviews)
5 Stars
Motorcraft SP-493
Spark Plug
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Our List Price: $5.18
(99) In Stock
Part Number: 5478-05048470
Notes: Spark Plug -- Plug Material: Platinum; Dual Plug; Gap: .044; Type - Alternative Plug
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl VIN: M 

Motorcraft Spark Plug
Click to Enlarge
(Read reviews)
Our List Price: $5.18
(99) In Stock
Part Number: 5478-05048477
Notes: Spark Plug -- Plug Material: Platinum; Gap: .054; Type - Alternative Plug
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 VIN: E 

E3 Spark Plugs Spark Plug
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(Read reviews)
Our List Price: $8.18
(1) In Stock
Part Number: 5478-05343289
Notes: Spark Plug
Features:
  • More Horsepower
  • Improved Fuel Efficiency
  • Reduced Engine Emissions
  • Longer Engine Life
  • Better Conductive Heat Transfer
  • Easier starts in all weather conditions
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 

E3 Spark Plugs Spark Plug
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(3 Reviews)
5 Stars
E3 Spark Plugs E3.54
Spark Plug
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Our List Price: $8.18
(20) In Stock
Part Number: 5478-05343295
Notes: Spark Plug -- Req. 2 plugs per cylinder
Features:
  • More Horsepower
  • Improved Fuel Efficiency
  • Reduced Engine Emissions
  • Longer Engine Life
  • Better Conductive Heat Transfer
  • Easier starts in all weather conditions
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Champion Spark Plug
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(Read reviews)
Our List Price: $7.18
(99) In Stock
Part Number: 5478-05267367
Notes: Champion Iridium -- Plug Type RS12WYPB4; 2 PLUGS/CYLINDER; Gap .044
Features:
  • Champion Iridium
Condition: New

Center Electrode Tip Material Iridium Firing Tip
Thread Diameter 0.551 in
Thread Diameter 14.000 mm

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Champion Spark Plug
Click to Enlarge
(Read reviews)
Our List Price: $3.18
(99) In Stock
Part Number: 5478-05027492
Notes: Copper Plus -- Plug Type RS12YC; 2 PLUGS/CYLINDER; Gap .044; OE Type
Features:
  • Champion Copper Plus
Condition: New

Center Electrode Tip Material Nickel Copper Alloy
Thread Diameter 0.551 in
Thread Diameter 14.000 mm

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Champion Spark Plug
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(1 Reviews)
5 Stars
Champion 18
Spark Plug
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Our List Price: $3.18
(99) In Stock
Part Number: 5478-05027447
Notes: Copper Plus -- Plug Type RV15YC4; Gap .054; OE Type
Features:
  • Champion Copper Plus
Condition: New

Center Electrode Tip Material Nickel Copper Alloy
Thread Diameter 0.551 in
Thread Diameter 14.000 mm

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Champion Spark Plug
Click to Enlarge
(Read reviews)
Our List Price: $7.18
(99) In Stock
Part Number: 5478-05027542
Notes: Double Platinum Power -- Plug Type RS10PYPB5; 2 PLUGS/CYLINDER; Gap .044
Features:
  • Champion Double Platinum
Condition: New

Center Electrode Tip Material Platinum Firing Tip
Thread Diameter 0.551 in
Thread Diameter 14.000 mm

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Champion Spark Plug
Click to Enlarge
(Read reviews)
Our List Price: $7.18
(99) In Stock
Part Number: 5478-05027532
Notes: Double Platinum Power -- Plug Type RV17PMP4; Gap .054
Features:
  • Champion Double Platinum
Condition: New

Center Electrode Tip Material Platinum Firing Tip
Thread Diameter 0.551 in
Thread Diameter 14.000 mm

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Champion Spark Plug
Click to Enlarge
(Read reviews)
Our List Price: $4.18
(99) In Stock
Part Number: 5478-05027482
Notes: Platinum Power -- Plug Type RS10PYC; 2 PLUGS/CYLINDER; Gap .044
Features:
  • Champion Platinum Power
Condition: New

Center Electrode Tip Material Platinum Firing Tip
Thread Diameter 0.551 in
Thread Diameter 14.000 mm

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Champion Spark Plug
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(Read reviews)
Our List Price: $4.18
(99) In Stock
Part Number: 5478-05027460
Notes: Platinum Power -- Plug Type RV17PMC4; Gap .054
Features:
  • Champion Platinum Power
Condition: New

Center Electrode Tip Material Platinum Firing Tip
Thread Diameter 0.551 in
Thread Diameter 14.000 mm

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Denso Spark Plug
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(Read reviews)
Our List Price: $7.18
(60) In Stock
Part Number: 5478-05169633
Notes: Iridium Power -- Gap 0.044; Iridium Power - Performance Upgrade with Worlds Smallest Center Electrode (0.4 mm Dia.) & Tapered Tip Patented U-Groove Design & Patented Iridium Alloy (90% Iridium)
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Denso Spark Plug
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(Read reviews)
Our List Price: $7.18
(99) In Stock
Part Number: 5478-05169631
Notes: Iridium Power -- Gap 0.044; Qty 2 Per Cyl.; Iridium Power - Performance Upgrade with Worlds Smallest Center Electrode (0.4 mm Dia.) & Tapered Tip Patented U-Groove Design & Patented Iridium Alloy (90% Iridium)
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Denso Spark Plug
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(Read reviews)
Our List Price: $8.18
(56) In Stock
Part Number: 5478-05445068
Notes: Iridium TT -- Gap 0.040; Iridium TT - Ultimate Endurance and Power, 0.4mm Iridium and 0.7mm Platinum Twin-Tip Technology
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Denso Spark Plug
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(Read reviews)
Our List Price: $8.18
(91) In Stock
Part Number: 5478-05445067
Notes: Iridium TT -- Gap 0.040; Qty 2 Per Cyl.; Iridium TT - Ultimate Endurance and Power, 0.4mm Iridium and 0.7mm Platinum Twin-Tip Technology
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Denso Spark Plug
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(Read reviews)
Our List Price: $4.18
(99) In Stock
Part Number: 5478-05169543
Notes: Platinum TT -- Gap 0.040; Platinum TT - Twin-Tip Technology Design with Platinum Center Electrode and Titanium Enhanced Ground Strap
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Denso Spark Plug
Click to Enlarge
(Read reviews)
Our List Price: $4.18
(99) In Stock
Part Number: 5478-05169546
Notes: Platinum TT -- Gap 0.040; Qty 2 Per Cyl.; Platinum TT - Twin-Tip Technology Design with Platinum Center Electrode and Titanium Enhanced Ground Strap
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Denso Spark Plug
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(Read reviews)
Product List Price:
$5.08
Our List Price: $4.58
(47) In Stock
Part Number: W0133-1642105
Notes: U-Groove
Features:
  • 100 percent pre-fired to ensure reliable operation
  • Patented U-Grove ground electrode
  • Bonded; center electrode and insulator for a gas-tight seal
  • Copper core center electrode for superior thermal conductivity
  • Unique five-rib insulator reduces flashover
  • Patented U-groove ground electrode design fires leaner mixtures than conventional plugs
  • Precision machine-rolled threads reduce seizing and cross-threading in delicate aluminum heads
  • Wide range of part numbers for t
Condition: New

Shipping Options:
Ground, Overnight, 2 Day
This Part Fits: Catalog: A
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Denso Spark Plug
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(Read reviews)
Our List Price: $3.18
(99) In Stock
Part Number: 5478-05052091
Notes: U-Groove Conventional -- Gap 0.032; Qty 2 Per Cyl.; O.E. Recommended Resistor Plug with Patented U-Groove Design
Features:
  • T20EPR-U
  • Increases engine performance and throttle response
  • Efficient fuel consumption
  • Improved cold-starting
  • Stable combustion during idling
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Denso Spark Plug
Click to Enlarge
(Read reviews)
Our List Price: $3.18
(99) In Stock
Part Number: 5478-05052087
Notes: U-Groove Conventional -- Gap 0.035; O.E. Recommended Resistor Plug with Patented U-Groove Design
Features:
  • T16PR-U
  • Increases engine performance and throttle response
  • Efficient fuel consumption
  • Improved cold-starting
  • Stable combustion during idling
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 

Bosch Spark Plug
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(Read reviews)
Our List Price: $5.18

Out of Stock
Part Number: 5478-05020943
Notes: Platinum Plus -- Gap 0.044 in
Features:
  • Exclusive platinum technology in the center electrode for quicker starts, smoother acceleration and increased fuel efficiency
  • Tapered, yttrium enhanced v-profile ground electrode provides a 25% longer performance life
  • Lower ignition voltage requirement provides reliable cold weather starting and superior operation under all driving conditions
  • Factory-set gap once the proper gap is set, there's no need to re-gap
  • Contains one spark plug
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Bosch Spark Plug
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(Read reviews)
Our List Price: $7.18

Out of Stock
Part Number: 5478-05310676
Notes: Platinum+2 -- Do Not Gap, Gap is Preset
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Body Engine
1991 Ford Mustang Convertible  5.0L V8 
1991 Ford Mustang Hatchback  5.0L V8 

Bosch Spark Plug
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(Read reviews)
Our List Price: $7.18

Out of Stock
Part Number: 5478-05527784
Notes: Platinum+2 -- Do Not Gap, Gap is Preset
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 2.3L 4 Cyl 

Bosch Spark Plug
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(Read reviews)
Our List Price: $7.18

Out of Stock
Part Number: 5478-05021002
Notes: Platinum+4 -- Do Not Gap, Gap is Preset
Features:
  • Revolutionary surface air gap firing technology featuring four yttrium-enhanced ground electrodes delivers the longest, most powerful spark for ultimate engine performance
  • Four yttrium-enhanced ground electrodes provide optimum access to the air/fuel mixture for the most efficient combustion, plus the yttrium alloy ground electrodes reduce gap wear and oxidation for extended performance life
  • Electrode gap is factory set to provide ease of installation - never requires adjustment
  • Never requires gapping,the electrode gap is factory-set and never requires adjustment
  • Provides ease of installation - never requires adjustment
Condition: New

Shipping Options:
Ground
This Part Fits: Catalog: B
Vehicle Engine
1991 Ford Mustang 5.0L V8 



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