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Old 02-29-2012, 09:04 AM
mannasugar mannasugar is offline
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Re: 90 Celica misfire

Rod,
The first time the car would not start, I wanted to check spark coming out of the coil. I was by myself so I used some speaker wire I have set up with alligator clips on the ends. I clamped the alligator clips to the coil wire and ran the wire to the car door hinge so that I could reach it and see it at the same time while I turned the key over (plenty of spark coming out of the coil). I pulled the number one spark plug wire off and ran my extension wire to the door, I held it close and the car would not start. I went to the number 2 cylinder and ran my extension wire and when I cranked the engine over it wasn't sparking, but soon after a couple of revolutions it began to spark and the car started. The car was running rough because there were only 3 cylinders firing.

Spark plugs are screwed into the heads which is ground. So, I don't know what you mean when you say "grounding a wire will cause a misfire". All spark plugs are grounded. The center of the spark plug is isolated from ground and the spark jumps to ground at the gap.
What does any fuel question has to do with spark?

Thank you
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