Question about 1998 Ford Escort

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Piston doesn't fire at low rpm

Car runs good at higher rpm... when idling one piston doesn't fire.. all spark
plugs have been checked produce spark... injector has been replace on
problem cylinder..my next step will be to check compression... hasn't been done yet.. exhaust manifold was cracked but has been welded shut.

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Start car, un-plug one spark plug wire at a time and you should hear and see a spark. that means that one is working fine, then go to the next if you dont see a spark from that one after unplugging then that one needs a coil.

Posted on Jan 20, 2009

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Lean misfire on cylinder 1, checked for air fuel and spark, still found nothing wrong.


Hi Austin:
Just for fun, I'd do a compression check on #1.
If it is low, at low RPM it would explain the misfire.
At higher RPM the compression happens faster so the source of the does not have as much time to allow pressure drop, so the mis-fire disappears like magic.
Reply as a COMMENT to this post to let me know what you find.
Cheers.

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