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Could it be the coil? 1800 1970

posted by  Dave B on  Sun Apr 3 14:12 CST 2005
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last visit: Fri Sep 26 19:07 CST 2014
[RELATED]

It's extremely intermittent. Definitely not the TPS. I'm an old hand at cleaning and adjusting these. In this case, the TPS is nearly brand new, but I still cleaned and re-adjusted it.


I have a vacuum gauge hooked up inside the cabin. Usually, at idle, the needle is pretty steady. But when this miss thing is happeneing, at idle the needle oscillates pretty wildly.

A leak down test initially led me to the "valve job" theory. But I ran some some expensive, high-tech decarbonizer through the system and that really helped the problem. The miss went from full time to intermittent. I think I may have had two problems.

The suggestion about an ignition analysis is probably one I should heed. Of course, with my luck, the problem wouldn't happen when they hooked it up, That's why I suspect that old coil and would like to replace that first.






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