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missfire

chimalsu
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chimalsu Member

chimalsu

Posted
Posted

my 87 944s starts first time and runs fine through the gears,but missfires when trying to accellerate from 60 plus on the motorway.this happens even if i drop a gear and on a constant throttle.after a while it clears and runs fine until the next journey and the whole routine starts again.anyone got ideas

magcuda Member

magcuda

Posted
Posted

this could be most likely speed/reference sensor related. the way to check is to get the problem going and scope the sensor.

chimalsu Member

chimalsu

Posted
  • Author
Posted

cheers maqcuda,been out in the car today without a problem,looks like its going to be intermittent,so not a lot i can do untill ithe problem comes back.

magcuda Member

magcuda

Posted
Posted

I had a S one time that as soon as you hit 5000 rpm, no matter what gear it started missing like it was hitting a rev limiter. turned out to be the speed/ reference sensor

good luck

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