How to service and repair spark plugs on Ford Explorer?

Begin testing spark plugs by disconnecting wires from the spark plugs before pulling out the spark plugs. Clear the spark plug well by blowing compressed air before taking out the spark plugs. Normal operating procedure requires using a previously installed original spark plug only in the cylinder it came from but fresh spark plugs may be added to any cylinder. The service begins with spark plug wire removal after which you should inspect the plugs before using a suitable tool to measure and adjust the spark plug gap appropriately. Perform the opposite steps for spark plug installation after completion of removal.

How to inspect a spark plug for issues such as bridged gaps, deposit buildup, oil fouling, carbon fouling, normal burning, preignition, overheating, and fused deposits on Ford Mustang?

The spark plug's gap needs inspection to verify if deposits between electrodes have bridged because of oil or carbon fouling. Break detection is indicated by deposits on the spark plug. Therefore, the spark plug requires cleaning. Oil fouling can be identified by wet black stains on the spark plug insulator shell bore electrodes caused by oil entering the combustion chamber from worn rings or pistons or by either excessive valve to guide clearance or worn or loose bearings. Any oil leaks must be addressed before installing a new spark plug. Check for carbon fouling by inspecting black dry fluffy carbon deposits on insulator tips, exposed shell surfaces, and electrodes because it is a sign of incorrect heat range spark plugs or a dirty air cleaner or excessive idling or rich fuel mixture; it is necessary to clean the spark plug if these conditions are present. Normal burning can be checked through the examination of light tan or gray residue deposited on the firing tip. Preignition signs include melted electrodes together with possible insulator damage that reveals engine damage from improper ignition timing or incorrect fuel type or unauthorized heli-coil insert use instead of spark plug threads warrant the replacement of the spark plug. Engine overheating together with improper fuel choice or loose or heat-inappropriate spark plugs or insufficient fuel pressure or incorrect ignition timing can lead to electrode damage that manifests as white or light gray-colored spots and bluish black burns appearing on the electrodes. The solution requires replacement of the spark plug. The last step involves examining fused deposits that appear as melted or spotty blisters and bubbles which result from sudden acceleration. Cleaning the spark plug may be required when fused deposits are detected.

How to inspect a spark plug for an abridged gap and identify potential issues on Ford Ranger?

Examine the spark plug for a damaged gap by inspecting the electrodes for formation of deposits that press the gap shut due to oil or carbon fouling. Perform cleaning of the spark plug if needed. The presence of wet black deposits on bore electrodes of the insulator shell indicates excessive oil entry into the chamber through defective rings and pistons or high guide-to-valve clearance or worn or loose bearings. Fix all oil-related issues before a new spark plug installation. Black dry fluffy carbon deposits on insulator tips exposed shell surfaces and electrodes warn about incorrect heat range along with a dirty air cleaner and rich fuel mixture and too much idling; cleaning the spark plug becomes necessary when these conditions exist. A properly burning spark plug produces light tan or gray residues which should appear on the firing tip. Spark plug checks should feature evaluations of melted electrodes and damaged insulators with metallic deposits that point to engine damage due to incorrect ignition timing and fuel type selection or heli-coil thread insert replacements requiring a new spark plug installation. The inspection of overheating shows itself through electrodes displaying white or light gray spots and a bluish-burnt appearance and the primary causes include engine overheating and using incorrect fuel types and loose spark plugs and spark plugs with the wrong heat range and low fuel pump pressure and incorrect ignition timing. New spark plugs must be installed when necessary. The presence of fused deposits leads to spark plug updating since these deposits appear as bubble-like or blister-shaped melted areas that usually form during fast accelerations.

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Ignition Spark Plug

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50 Spark Plugs found

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Ford Spark Plug
Part Number: PZK-1F
$10.25 MSRP: $20.73
You Save: $10.48 (51%)
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Product Specifications
- Replaced by: PZK-1F-X
Fits the following Ford Models:
- Expedition | 2007 | Eddie Bauer, EL Eddie Bauer, EL Limited, EL XLT, Limited, XLT | 8 Cyl 5.4 L GAS
- Explorer | 2006-2008 | Eddie Bauer, Limited, XLT | 8 Cyl 4.6 L GAS
- Explorer Sport Trac | 2007-2008 | Limited, XLT | 8 Cyl 4.6 L GAS
- F-150 | 2004-2008 | FX2, FX4, Harley-Davidson Edition, King Ranch, Lariat, Limited, THE 60TH ANNIVERSARY EDITION, XL, XLT | 8 Cyl 5.4 L FLEX, 8 Cyl 5.4 L GAS
- F-250 Super Duty | 2005-2007 | Harley-Davidson Edition, King Ranch, Lariat, XL, XLT | 10 Cyl 6.8 L GAS, 8 Cyl 5.4 L GAS
- F-350 Super Duty | 2005-2007 | Harley-Davidson Edition, King Ranch, Lariat, XL, XLT | 10 Cyl 6.8 L GAS, 8 Cyl 5.4 L GAS
- Mustang | 2005-2008 | Bullitt, GT, Shelby GT | 8 Cyl 4.6 L GAS
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Ford Spark Plug
Part Number: AGSF-32P-M
$5.89 MSRP: $9.35
You Save: $3.46 (38%)
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Product Specifications
- Other Name: High Ignitability Spark Plug; Spark Plug Double Platinum; Spark Plug Iridium Power
- Replaced by: AGSF-32P-MX
Fits the following Ford Models:
- E-150 | 2008 | Base, XL, XLT | 8 Cyl 4.6 L GAS
- E-250 | 2008 | Base | 8 Cyl 4.6 L GAS
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Ford Spark Plug
Part Number: AGSF-22F-MX
$5.52 MSRP: $8.76
You Save: $3.24 (37%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: SP-500, AGSF-22F-M
Fits the following Ford Models:
- Explorer | 1997-2005 | Eddie Bauer, Limited, NBX, Postal, Sport, XL, XL Fleet, XLS, XLS Sport, XLT, XLT Sport | 6 Cyl 4.0 L FLEX, 6 Cyl 4.0 L GAS
- Explorer Sport | 2001-2003 | Base, XLS, XLT | 6 Cyl 4.0 L GAS
- Explorer Sport Trac | 2001-2005 | Adrenalin, Base, XL, XLS, XLT | 6 Cyl 4.0 L FLEX, 6 Cyl 4.0 L GAS
- Ranger | 1998-2008 | Edge, FX4, Splash, Sport, STX, Tremor, XL, XLT | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS, 6 Cyl 4.0 L GAS
- Taurus | 2000-2007 | LX, SE, SE Comfort, SEL, SES, SVG | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Ford Spark Plug
Part Number: 4C3Z-12A342-A
$18.33 MSRP: $28.36
You Save: $10.03 (36%)
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Product Specifications
- Other Name: Glow Plug; Diesel Glow Plug
- Replaces: 4C3Z-12A342-AA, 4C3Z-12A342-A2, ZD-13-A2, ZD-13
Fits the following Ford Models:
- E-350 Super Duty | 2004-2010 | Base, Chateau, XL, XLT | 10 Cyl 6.8 L CNG, 10 Cyl 6.8 L GAS, 10 Cyl 6.8 L LPG, 8 Cyl 5.4 L CNG, 8 Cyl 5.4 L FLEX, 8 Cyl 5.4 L GAS, 8 Cyl 5.4 L LPG, 8 Cyl 6.0 L DIESEL
- Excursion | 2004-2005 | Eddie Bauer, Limited, XLS, XLT | 8 Cyl 6.0 L DIESEL
- F-250 Super Duty | 2005-2007 | Harley-Davidson Edition, King Ranch, Lariat, XL, XLT | 8 Cyl 6.0 L DIESEL
- F-350 Super Duty | 2004-2007 | Harley-Davidson Edition, King Ranch, Lariat, XL, XLT | 8 Cyl 6.0 L DIESEL
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Ford Spark Plug
Part Number: MC3Z-12A342-F
$13.74 MSRP: $21.82
You Save: $8.08 (38%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Glow Plug; Diesel Glow Plug
- Replaces: ZD-11, F4TZ-12A342-A, F4TZ-12A342-BA
Fits the following Ford Models:
- E-350 Econoline | 1995-1998 | Base, XL | 8 Cyl 7.3 L DIESEL
- E-350 Econoline Club Wagon | 1995-2002 | Chateau, Chateau HD, Custom, XL, XL HD, XLT, XLT HD | 8 Cyl 7.3 L DIESEL
- E-350 Super Duty | 1999-2003 | Base, XL | 8 Cyl 7.3 L DIESEL
- Excursion | 2000-2003 | Eddie Bauer, Limited, XLT | 8 Cyl 7.3 L DIESEL
- F-250 HD | 1997 | XL, XLT | 8 Cyl 7.3 L DIESEL
- F-250 Super Duty | 1999-2003 | Lariat, XL, XLT | 8 Cyl 7.3 L DIESEL
- F-350 | 1994-1997 | Base, Eddie Bauer, Special, XL, XLT | 8 Cyl 7.3 L DIESEL
- F-350 Super Duty | 1999-2003 | King Ranch, Lariat, XL, XLT | 8 Cyl 7.3 L DIESEL
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Ford Spark Plug
Part Number: AGSF-22Y-PCX
$11.26 MSRP: $17.87
You Save: $6.61 (37%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: AGSF-22Y-PC, SP-492
Fits the following Ford Models:
- Focus | 2003-2007 | LX, SE, ST, ZTS, ZTW, ZX3, ZX4 ST, ZX5 | 4 Cyl 2.3 L GAS
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Ford Spark Plug
Part Number: 3C3Z-12A342-A
$9.39 MSRP: $14.91
You Save: $5.52 (38%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Glow Plug; Diesel Glow Plug
- Replaces: ZD-12, 3C3Z-12A342-AA2, 3C3Z-12A342-AA, ZD-12-2
Fits the following Ford Models:
- Excursion | 2003-2005 | Eddie Bauer, Limited, XLS, XLT | 8 Cyl 6.0 L DIESEL
- F-250 Super Duty | 2003-2006 | Harley-Davidson Edition, King Ranch, Lariat, XL, XLT | 8 Cyl 6.0 L DIESEL
- F-350 Super Duty | 2003-2004 | Harley-Davidson Edition, King Ranch, Lariat, XL, XLT | 8 Cyl 6.0 L DIESEL
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Ford Spark Plug
Part Number: DYFS-12Y-PT
$12.81 MSRP: $19.82
You Save: $7.01 (36%)
Ships in 1-3 Business Days
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Fits the following Ford Models:
- Expedition | 2022-2024 | King Ranch, Limited, Max King Ranch, Max Limited, Max Platinum, Max SSV, Max XL, Max XLT, Platinum, SSV, Timberline, XL, XL STX, XLT | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- F-150 | 2021-2023 | King Ranch, Lariat, Limited, Platinum, Police Responder, Raptor, SSV, Tremor, XL, XLT | 6 Cyl 3.5 L FULL HYBRID EV-GAS (FHEV), 6 Cyl 3.5 L GAS
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Ford Spark Plug
Part Number: AGSF-24N-X
$4.22 MSRP: $6.53
You Save: $2.31 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: SP-412, AGSF-24N
Fits the following Ford Models:
- Explorer | 2006-2010 | Eddie Bauer, Limited, XLS, XLT | 6 Cyl 4.0 L GAS
- Explorer Sport Trac | 2007-2010 | Limited, XLT | 6 Cyl 4.0 L GAS
- Mustang | 2005-2010 | Base | 6 Cyl 4.0 L GAS
- Ranger | 2006-2011 | FX4, Sport, STX, XL, XLT | 6 Cyl 4.0 L GAS
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Ford Spark Plug
Part Number: CYFS-13Y-RCX
$9.53 MSRP: $15.13
You Save: $5.60 (38%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: CYFS-13Y-RC, SP-532
Fits the following Ford Models:
- Escape | 2013-2016 | SE, SEL, Titanium | 4 Cyl 1.6 L GAS
- Fiesta | 2014-2019 | ST | 4 Cyl 1.6 L GAS
- Fusion | 2013-2014 | SE | 4 Cyl 1.6 L GAS
- Transit Connect | 2014-2016 | Titanium, XL, XLT | 4 Cyl 1.6 L GAS
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Ford Spark Plug
Part Number: CYFS-12Y-RT3
$11.20 MSRP: $18.18
You Save: $6.98 (39%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: CYFS-12Y-PT, CYFS-92-YPT, CYFS-092-YPT
Fits the following Ford Models:
- Bronco | 2021-2023 | Badlands, Base, Big Bend, Black Diamond, Everglades, First Edition, Heritage Edition, Heritage Limited Edition, Outer Banks, Raptor, Wildtrak | 4 Cyl 2.3 L GAS, 6 Cyl 2.7 L GAS, 6 Cyl 3.0 L GAS
- Edge | 2015-2024 | SE, SEL, Sport, ST, ST-Line, Titanium | 4 Cyl 2.0 L GAS, 6 Cyl 2.7 L GAS
- Escape | 2020-2022 | SEL, Titanium | 4 Cyl 2.0 L GAS
- Expedition | 2018-2021 | King Ranch, Limited, Max King Ranch, Max Limited, Max Platinum, Max SSV, Max XL, Max XLT, Platinum, SSV, XL, XLT | 6 Cyl 3.5 L GAS
- Explorer | 2020-2023 | Base, King Ranch, Limited, Platinum, ST, ST-Line, Timberline, XLT | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
- F-150 | 2015-2023 | King Ranch, Lariat, Limited, Platinum, Police Responder, Raptor, SSV, Tremor, XL, XLT | 6 Cyl 2.7 L GAS, 6 Cyl 3.5 L FULL HYBRID EV-GAS (FHEV), 6 Cyl 3.5 L GAS
- Fusion | 2017-2019 | Sport | 6 Cyl 2.7 L GAS
- Maverick | 2022-2023 | Lariat, XL, XLT | 4 Cyl 2.0 L GAS
- Police Interceptor Utility | 2020-2023 | Base | 6 Cyl 3.0 L GAS
- Ranger | 2019-2023 | Lariat, XL, XLT | 4 Cyl 2.3 L GAS
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Ford Spark Plug
Part Number: AZFS-32F-EX
$7.67 MSRP: $12.45
You Save: $4.78 (39%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: AZFS-32F-EF4, AZFS-32F-E
Fits the following Ford Models:
- Escape | 2001-2004 | Limited, XLS, XLT | 4 Cyl 2.0 L GAS
- Escort | 1998-2003 | ZX2, ZX2 Cool Coupe, ZX2 Hot Coupe, ZX2 S/R | 4 Cyl 2.0 L GAS
- Focus | 2000-2007 | LX, S, SE, SES, Sony Limited Edition, ST, SVT, ZTS, ZTW, ZX3, ZX4, ZX4 ST, ZX5, ZXW | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
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Ford Spark Plug
Part Number: CYFS-12-FPX
$8.74 MSRP: $13.53
You Save: $4.79 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: SP-513, CYFS-092FP, CYFS-12-FP, SP-526
Fits the following Ford Models:
- E-350 Super Duty | 2017-2019 | Base | 8 Cyl 6.2 L FLEX
- F-150 | 2010-2014 | FX2, FX4, Harley-Davidson Edition, Lariat, Lariat Limited, Platinum, SVT Raptor, XLT | 8 Cyl 6.2 L GAS
- F-250 Super Duty | 2011-2022 | King Ranch, Lariat, Platinum, XL, XLT | 8 Cyl 6.2 L FLEX
- F-350 Super Duty | 2011-2022 | King Ranch, Lariat, Platinum, XL, XLT | 8 Cyl 6.2 L FLEX
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Ford Spark Plug
Part Number: AGSF-32W-MX
$5.73 MSRP: $8.87
You Save: $3.14 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: AGSF-32W-, AGSF-32W-M, AGSF-32W-MF4, SP-433
Fits the following Ford Models:
- Escape | 2001-2006 | Limited, XLS, XLT, XLT No Boundaries, XLT Sport | 6 Cyl 3.0 L GAS
- Five Hundred | 2005-2007 | Limited, SE, SEL | 6 Cyl 3.0 L GAS
- Freestyle | 2005-2007 | Limited, SE, SEL | 6 Cyl 3.0 L GAS
- Fusion | 2006-2009 | SE, SEL | 6 Cyl 3.0 L GAS
- Taurus | 2000 | SE, SE Comfort, SEL, SVG | 6 Cyl 3.0 L GAS
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Ford Spark Plug
Part Number: CGSF-12Y-PX
$11.75 MSRP: $18.18
You Save: $6.43 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: CGSF-12Y-P, SP-536
Fits the following Ford Models:
- Mustang | 2013-2014 | Shelby GT500 | 8 Cyl 5.8 L GAS
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Ford Spark Plug
Part Number: CYFS-12Y-PCTX
$11.48 MSRP: $17.76
You Save: $6.28 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: CYFS-12Y-PC, CYFS-12Y-PCT, SP-527, SP-550, CYFS-12Y-2
Fits the following Ford Models:
- Bronco Sport | 2021-2023 | Badlands, Base, Big Bend, First Edition, Heritage Limited Edition, Outer Banks | 3 Cyl 1.5 L GAS, 4 Cyl 2.0 L GAS
- Edge | 2013-2018 | Limited, SE, SEL, Titanium | 4 Cyl 2.0 L GAS
- Escape | 2013-2022 | S, SE, SEL, Titanium | 3 Cyl 1.5 L GAS, 4 Cyl 2.0 L GAS
- Explorer | 2012-2019 | Base, Limited, XLT | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
- F-150 | 2017-2020 | King Ranch, Lariat, Limited, Platinum, Police Responder, SSV, XL, XLT | 6 Cyl 3.5 L GAS
- Focus | 2013-2018 | RS, ST | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
- Fusion | 2013-2020 | Platinum, SE, SEL, Titanium | 4 Cyl 2.0 L GAS
- Mustang | 2015-2023 | EcoBoost, EcoBoost Premium | 4 Cyl 2.3 L GAS
- Special Service Police Sedan | 2014-2018 | Base | 4 Cyl 2.0 L GAS
- Taurus | 2013-2017 | Limited, SE, SEL | 4 Cyl 2.0 L GAS
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Ford Spark Plug
Part Number: AGSF-32Y-RAX
$7.93 MSRP: $12.27
You Save: $4.34 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: AGSF-32Y-PC, AGSF-32Y-R, AGSF-32Y-RA, SP-541, SP-541-A, SP-448
Fits the following Ford Models:
- Escape | 2005-2008 | Hybrid, XLS, XLT, XLT No Boundaries | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS
- Focus | 2008-2011 | S, SE, SEL, SES | 4 Cyl 2.0 L GAS
- Ranger | 2010-2011 | XL, XLT | 4 Cyl 2.3 L GAS
- Transit Connect | 2010-2013 | XL, XLT, XLT Premium | 4 Cyl 2.0 L GAS
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Ford Spark Plug
Part Number: CYFS-12-YT4X
$11.64 MSRP: $18.02
You Save: $6.38 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: CYFS-12-YT3, CYFS-12F-3, SP-580, CYFS-12-Y3, CYFS-12-YT4, SP-528, SP-512-A
Fits the following Ford Models:
- Expedition | 2015-2017 | EL King Ranch, EL Limited, EL Platinum, EL SSV, EL XL, EL XLT, King Ranch, Limited, Platinum, SSV, XL, XLT | 6 Cyl 3.5 L GAS
- Explorer | 2013-2019 | Platinum, Sport | 6 Cyl 3.5 L GAS
- F-150 | 2011-2016 | FX2, FX4, King Ranch, Lariat, Limited, Platinum, SSV, XL, XLT | 6 Cyl 3.5 L GAS
- Flex | 2010-2019 | Limited, SEL, Titanium | 6 Cyl 3.5 L GAS
- Police Interceptor Sedan | 2013-2019 | Base | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- Police Interceptor Utility | 2014-2019 | Base | 6 Cyl 3.5 L GAS
- Taurus | 2010-2019 | Limited, SE, SEL, SHO | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- Transit-150 | 2015-2023 | Base, PTV, XL, XLT | 6 Cyl 3.5 L GAS
- Transit-250 | 2015-2023 | Base, PTV | 6 Cyl 3.5 L GAS
- Transit-350 | 2015-2023 | Base, PTV, XL, XLT | 6 Cyl 3.5 L GAS
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Ford Spark Plug
Part Number: AYFS-32Y-RX
$11.41 MSRP: $17.65
You Save: $6.24 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: AYFS-32Y-R, SP-490, SP-530, AYSF-32Y-PC
Fits the following Ford Models:
- C-Max | 2013-2018 | Energi SE, Energi SEL, Energi Titanium, Hybrid SE, Hybrid SEL, Hybrid Titanium | 4 Cyl 2.0 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- Escape | 2009-2023 | Hybrid, Limited, Limited Hybrid, Platinum Hybrid, Plug-In Hybrid, S, SE, SE Hybrid, SE Plug-In Hybrid, SE Sport Hybrid, SEL Hybrid, SEL Plug-In Hybrid, ST-Line Elite Hybrid, ST-Line Hybrid, ST-Line Select Hybrid, Titanium Hybrid, Titanium Plug-In Hybrid, XLS, XLT | 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS, 4 Cyl 2.5 L PLUG-IN HYBRID EV-GAS (PHEV)
- Fusion | 2006-2020 | Energi Platinum, Energi SE, Energi Titanium, Hybrid, Platinum Hybrid, S, S Hybrid, SE, SE Hybrid, SEL, SEL Hybrid, Titanium Hybrid | 4 Cyl 2.0 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV), 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L FLEX, 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS
- Maverick | 2022-2023 | Lariat, XL, XLT | 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV)
- Police Responder Hybrid | 2019-2020 | Base | 4 Cyl 2.0 L FULL HYBRID EV-GAS (FHEV)
- SSV Plug-In Hybrid | 2019-2020 | Base | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- Transit Connect | 2014-2022 | Titanium, XL, XLT | 4 Cyl 2.5 L CNG, 4 Cyl 2.5 L GAS, 4 Cyl 2.5 L LPG
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Ford Spark Plug
Part Number: AGSF-32F-MX
$5.41 MSRP: $8.36
You Save: $2.95 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: AGSF-32F-SM, AGSF-32F-M, SP-470-X, SP-470, SP-432, AGSF-32F-SMX, AWSF-32F-
Fits the following Ford Models:
- Crown Victoria | 1995-1997 | Base, LX, Police Interceptor, S | 8 Cyl 4.6 L CNG, 8 Cyl 4.6 L GAS
- Explorer | 1996-2001 | Eddie Bauer, Limited, XLS, XLT | 8 Cyl 5.0 L GAS
- F-150 | 1997-2000 | Base, Lariat, XL, XLT | 8 Cyl 4.6 L GAS
- F-250 | 1997-1999 | Base, Lariat, XL, XLT | 8 Cyl 4.6 L GAS
- Ranger | 1998-2003 | Edge, Splash, XL, XLT | 4 Cyl 2.5 L GAS, 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
- Taurus | 2000-2007 | LX, SE, SE Comfort, SEL, SES, SVG | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
- Windstar | 1999-2000 | 3.0L, Base, SE, SEL | 6 Cyl 3.0 L GAS
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Ford Spark Plug Parts Questions & Experts Answers

Spark Plug
AGSF-32P-MX
Q: How to service and repair spark plugs on Ford Explorer?
A: Begin testing spark plugs by disconnecting wires from the spark plugs before pulling out the spark plugs. Clear the spark plug well by blowing compressed air before taking out the spark plugs. Normal operating procedure requires using a previously installed original spark plug only in the cylinder it came from but fresh spark plugs may be added to any cylinder. The service begins with spark plug wire removal after which you should inspect the plugs before using a suitable tool to measure and adjust the spark plug gap appropriately. Perform the opposite steps for spark plug installation after completion of removal.
Spark Plug
PZK-1F
Q: How to inspect a spark plug for issues such as bridged gaps, deposit buildup, oil fouling, carbon fouling, normal burning, preignition, overheating, and fused deposits on Ford Mustang?
A: The spark plug's gap needs inspection to verify if deposits between electrodes have bridged because of oil or carbon fouling. Break detection is indicated by deposits on the spark plug. Therefore, the spark plug requires cleaning. Oil fouling can be identified by wet black stains on the spark plug insulator shell bore electrodes caused by oil entering the combustion chamber from worn rings or pistons or by either excessive valve to guide clearance or worn or loose bearings. Any oil leaks must be addressed before installing a new spark plug. Check for carbon fouling by inspecting black dry fluffy carbon deposits on insulator tips, exposed shell surfaces, and electrodes because it is a sign of incorrect heat range spark plugs or a dirty air cleaner or excessive idling or rich fuel mixture; it is necessary to clean the spark plug if these conditions are present. Normal burning can be checked through the examination of light tan or gray residue deposited on the firing tip. Preignition signs include melted electrodes together with possible insulator damage that reveals engine damage from improper ignition timing or incorrect fuel type or unauthorized heli-coil insert use instead of spark plug threads warrant the replacement of the spark plug. Engine overheating together with improper fuel choice or loose or heat-inappropriate spark plugs or insufficient fuel pressure or incorrect ignition timing can lead to electrode damage that manifests as white or light gray-colored spots and bluish black burns appearing on the electrodes. The solution requires replacement of the spark plug. The last step involves examining fused deposits that appear as melted or spotty blisters and bubbles which result from sudden acceleration. Cleaning the spark plug may be required when fused deposits are detected.
Spark Plug
AGSF-22F-MX
Q: How to inspect a spark plug for an abridged gap and identify potential issues on Ford Ranger?
A: Examine the spark plug for a damaged gap by inspecting the electrodes for formation of deposits that press the gap shut due to oil or carbon fouling. Perform cleaning of the spark plug if needed. The presence of wet black deposits on bore electrodes of the insulator shell indicates excessive oil entry into the chamber through defective rings and pistons or high guide-to-valve clearance or worn or loose bearings. Fix all oil-related issues before a new spark plug installation. Black dry fluffy carbon deposits on insulator tips exposed shell surfaces and electrodes warn about incorrect heat range along with a dirty air cleaner and rich fuel mixture and too much idling; cleaning the spark plug becomes necessary when these conditions exist. A properly burning spark plug produces light tan or gray residues which should appear on the firing tip. Spark plug checks should feature evaluations of melted electrodes and damaged insulators with metallic deposits that point to engine damage due to incorrect ignition timing and fuel type selection or heli-coil thread insert replacements requiring a new spark plug installation. The inspection of overheating shows itself through electrodes displaying white or light gray spots and a bluish-burnt appearance and the primary causes include engine overheating and using incorrect fuel types and loose spark plugs and spark plugs with the wrong heat range and low fuel pump pressure and incorrect ignition timing. New spark plugs must be installed when necessary. The presence of fused deposits leads to spark plug updating since these deposits appear as bubble-like or blister-shaped melted areas that usually form during fast accelerations.