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What could be causing the engine to misfire? 850 1996

posted by  KlausC on  Sat May 7 09:23 CST 2016
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last visit: Fri Oct 24 10:15 CST 2014
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I seriously doubt it is the FP relay. If the fuel pump is original, it could be tired when it warms up. Pulling the spark plugs and finding them 'clean' would point to the fuel pump. Easy to determine:

Once the engine warms up and the CEL comes on again, take a fuel pressure reading. If it is low, thank the gods that you aren't just stranded and in need of a tow.

With the engine idling higher than normal and running 'lean' (clean plugs), it could also point to a vacuum leak in the intake manifold gasket.
--
Keeping it running is better than buying new






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New What could be causing the engine to misfire? [850][1996]
posted by  Hugh  on Fri May 6 20:09 CST 2016 >


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