How to inspect a spark plug for issues such as bridged gaps, fouling, and overheating on Mercury Monterey?

Examine the spark plug in regard to bridged gaps and carcinogenic deposition of oil or carbon. Clean if necessary. Oil fouling (wet, black deposits), carbon fouling (black, dry deposits). Find normal burning (light tan deposits) and evidence of overheat or pre-ignition, and change the spark plug as necessary.

OEM Mercury Monterey Spark Plug

Ignition Spark Plug

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Mercury Monterey Spark Plug Part Number: AGSF-42F-MX
$5.40 MSRP: $8.58
You Save: $3.18 (38%)
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Product Specifications
- Replaces: AGSF-42F-M, SP-486
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2004-2007 Mercury Monterey | Base, Convenience, Luxury, Premier | 6 Cyl 4.2 L GAS

Mercury Monterey Spark Plug

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Mercury Monterey Spark Plug Parts and Q&A

Spark Plug
AGSF-42F-MX
Q: How to inspect a spark plug for issues such as bridged gaps, fouling, and overheating on Mercury Monterey?
A: Examine the spark plug in regard to bridged gaps and carcinogenic deposition of oil or carbon. Clean if necessary. Oil fouling (wet, black deposits), carbon fouling (black, dry deposits). Find normal burning (light tan deposits) and evidence of overheat or pre-ignition, and change the spark plug as necessary.