I have been experiencing an intermittent misfire on my truck. It has only done it once in a while and usually when it is raining, but it has done it once when it is dry outside. I took it to a friend with a scan tool and it said that there is a misfire in #4 cylinder. What is the most likely cause of this? I did try to do a search before posting with no luck. Any help will be appreciated. The truck is a 98.

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Unfortunately, 8 coils means 8-times the possibility for failure.

My '97 developed a mis-firing coil around 18,000 miles -- and, of course, when I took it to the dealership, it was working just fine.

It was replaced under warranty and the engine ran flawlessly again (traded it at 42000 miles and running great).

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Y2K™ Jim

Toreador Red, Keyless XLT SC SB 5.4L E4x4 4wDisc/ABS, 3.73LS, Skid, HD 7700# Towing, LT-245's on Chrome, Tube-Steps, Captain's, 6CD, Tonneau, named: "Nick"

 

This is usually caused by a cracked boot or carbon tracking.

Moisture in the spark plug well can also cause this. I believe the coil and boot are replaced as an assembly.



[This message has been edited by crash1 (edited 09-12-2000).]