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

Verify that the spark plug shows no bridged gap by examining the area between electrodes while looking for any deposits that restrict the gap caused by oil or carbon fouling. It is essential to clean the spark plug when required. The spark plug may show oil fouling through wet black deposits on specified areas mainly caused by faulty rings and pistons along with valve to guide clearance errors and worn or loose bearings. Repair all oil leak sources before installing a new spark plug. Carbon fouling can be identified when black, dry, fluffy carbon accumulates on insulator tips and exposed shell surfaces and electrodes because of incorrect heat range spark plugs or blocked air filters or rich fuel mixtures or abnormal idling behavior; cleaning the plug fixes such contamination. The inspection of normal burning requires you to look for light tan or gray materials on the firing tip. A Heli coil or improper installation of the insert in spark plug threads will require a new spark plug along with engine damage analysis if the inspector detects electrode melting and insulator damage alongside metallic deposits. These signs could be linked to incorrect ignition timing, fuel problems, or unauthorized Heli coil interference. Overheating detection reveals white or light gray spots along with bluish burnt electrode appearance due to engine overheating or using wrong fuel along with loose plugs or improper heat range or weakened fuel pressure or off-time events requiring new spark plug installation. Drilled deposits affecting spark plugs should be inspected through melted or spotty formations that look like bubbles or blisters caused by abrupt acceleration before deciding whether to clean the plug.

OEM Ford Explorer Spark Plug

Ignition Spark Plug

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11 Spark Plugs found

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Ford Explorer 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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2006-2008 Ford Explorer | Eddie Bauer, Limited, XLT | 8 Cyl 4.6 L GAS
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Ford Explorer Spark Plug
Part Number: CYFS-12Y-T6
$5.39 MSRP: $8.35
You Save: $2.96 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: CYFS-12Y-T5, CYFS-12F-5X, SP-586, BR3Z-12405-A, CYFS-O92-FT, CYFS-12F-5, SP-520, SP-520-X
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2011-2023 Ford Explorer | Base, Limited, Limited Hybrid, Platinum Hybrid, XLT | 6 Cyl 3.3 L FULL HYBRID EV-GAS (FHEV), 6 Cyl 3.5 L GAS
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Ford Explorer Spark Plug
Part Number: AGSF-44F-MX
$5.11 MSRP: $8.29
You Save: $3.18 (39%)
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Product Specifications
- Replaces: AGSF-44F-M
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1995-1996 Ford Explorer | Eddie Bauer, Expedition, Limited, Sport, XL, XLT | 6 Cyl 4.0 L GAS
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Ford Explorer Spark Plug
Part Number: HJFS-24FP-X
$9.73 MSRP: $15.06
You Save: $5.33 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: SP-509, HJFS-24FP
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2008-2010 Ford Explorer | Eddie Bauer, Limited, XLT | 8 Cyl 4.6 L GAS
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Ford Explorer 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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2013-2019 Ford Explorer | Platinum, Sport | 6 Cyl 3.5 L GAS
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Ford Explorer 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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2012-2019 Ford Explorer | Base, Limited, XLT | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
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Ford Explorer Spark Plug
Part Number: AGSF-32P-MX
$6.04 MSRP: $9.35
You Save: $3.31 (36%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaces: AGSF-32P-M, AGSF-32P-MF4, SP-493
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2002-2005 Ford Explorer | Eddie Bauer, Limited, NBX, XLT, XLT Sport | 8 Cyl 4.6 L GAS
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Ford Explorer 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-
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1996-2001 Ford Explorer | Eddie Bauer, Limited, XLS, XLT | 8 Cyl 5.0 L GAS
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Ford Explorer Spark Plug
Part Number: AGSF-24N-X
$4.22 MSRP: $6.53
You Save: $2.31 (36%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaces: SP-412, AGSF-24N
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2006-2010 Ford Explorer | Eddie Bauer, Limited, XLS, XLT | 6 Cyl 4.0 L GAS
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Ford Explorer Spark Plug
Part Number: AGSF-22F-MX
$5.52 MSRP: $8.76
You Save: $3.24 (37%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaces: SP-500, AGSF-22F-M
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1997-2005 Ford Explorer | 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
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Ford Explorer Spark Plug
Part Number: CYFS-12Y-RT3
$11.20 MSRP: $18.18
You Save: $6.98 (39%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaces: CYFS-12Y-PT, CYFS-92-YPT, CYFS-092-YPT
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2020-2023 Ford Explorer | Base, King Ranch, Limited, Platinum, ST, ST-Line, Timberline, XLT | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS

Ford Explorer Spark Plug

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Ford Explorer Spark Plug Parts Questions & Experts Answers

Spark Plug
AGSF-22F-MX
Q: How to inspect a spark plug for issues such as bridged gaps, deposit buildup, oil fouling, carbon fouling, normal burning, pre-ignition, overheating, and fused deposits on Ford Explorer?
A: Verify that the spark plug shows no bridged gap by examining the area between electrodes while looking for any deposits that restrict the gap caused by oil or carbon fouling. It is essential to clean the spark plug when required. The spark plug may show oil fouling through wet black deposits on specified areas mainly caused by faulty rings and Pistons along with valve to guide clearance errors and worn or loose bearings. Repair all oil leak sources before installing a new spark plug. Carbon fouling can be identified when black, dry, fluffy carbon accumulates on insulator tips and exposed shell surfaces and electrodes because of incorrect heat range spark plugs or blocked air filters or rich fuel mixtures or abnormal idling behavior; cleaning the plug fixes such contamination. The inspection of normal burning requires you to look for light tan or gray materials on the firing tip. A Heli coil or improper installation of the insert in spark plug threads will require a new spark plug along with engine damage analysis if the inspector detects electrode melting and insulator damage alongside metallic deposits. These signs could be linked to incorrect ignition timing, fuel problems, or unauthorized Heli coil interference. Overheating detection reveals white or light gray spots along with bluish burnt electrode appearance due to engine overheating or using wrong fuel along with loose plugs or improper heat range or weakened fuel pressure or off-time events requiring new spark plug installation. Drilled deposits affecting spark plugs should be inspected through melted or spotty formations that look like bubbles or blisters caused by abrupt acceleration before deciding whether to clean the plug.