Tech Tip: Mitsubishi Spark Plug Fouling – UnderhoodService
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Tech Tip: Mitsubishi Spark Plug Fouling

Customers with any Mitsubishi model who drive short distances in cold weather may experience spark plug fouling. If a vehicle is hard to start or exhibits rough idle or misfire, the spark plugs may be wet or have some accumulated carbon deposits. Cleaning the plugs should correct the problem. Spark plug replacement should not be necessary.

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Customers with any Mitsubishi model who drive short distances in cold weather may experience spark plug fouling. If a vehicle is hard to start or exhibits rough idle or misfire, the spark plugs may be wet or have some accumulated carbon deposits. Cleaning the plugs should correct the problem. Spark plug replacement should not be necessary.

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SERVICE PROCEDURE:
1. Start the engine and warm it to normal operating temperature.
2. Clean the spark plugs as follows:
Caution: Do not exceed the following driving or engine rpm speeds.
a. Drive the vehicle at 25-40 mph at 4,000 to 4,500 rpm for five minutes. This will bring the spark plug temperature up to a point that will burn off the carbon deposits.
b. If the above driving method does not correct the problem, remove the spark plugs and use an appropriate spark plug cleaner to remove any carbon deposits.

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For additional information, visit www.mitchell1.com.

Technical service bulletin courtesy of Mitchell 1.

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