whatcould be causing the misfire


Asked by Nov 05, 2015 at 03:17 PM about the 2002 Lincoln LS V8

Question type: Maintenance & Repair

I have a Lincoln LS V8 2002. it would misfire at 45mph and stop misfiring at 50mph. I changed the spark plugs and also a cracked valve cover. the car idled fine for 45 min. as soon as I started to drive the car, I got about 50 feet and it started to misfire really bad. what would cause this problem?

3 Answers

Tom Harmon

You may have a crack in the ignition coil ... or Plug wires .... Open the hood when it's dark .. start the engine and have a friend Rev it up ..and you can sometimes see where the sparking is coming from

1 out of 1 people think this is helpful.

I would say you have a bad coil. There is a coil on each cylinder and if they are going bad you will get a misfire. Once it gets bad enough the check engine light will come on and tell you which one it is. Never wash a Ford Triton engine as the water ruins coils.

1 out of 1 people think this is helpful.
Bob Beaman

Likely a bad coil or a plug wire boot has a small hole burned through it due to the high voltage to the spark plugs. If it hasn't been done I would replace all spark Plugs, plug boots and coils. Make sure you use genuine Ford coils or you risk having more problems. Some of the after market coils don't work for long in Fords.

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