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damien89 89 vette misfires when at operating temperature
Guru
53 Posts
Member since:
2010/6/19 21:57



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Hi, my 89 vette misfires when it reaches above 160'f +, it does it randomnly but it always does it, if i turn off the engine and restart it it works fine then after a few seconds it starts misfiring again. When it misfires the fuel pressure drops and if i give it a bit of throttle it jumps between 10-50 psi erratically, i was going to change the fuel pump but when its cold it works just fine, 40psi at idle and 47psi with load.

Anyone have any tips what should i check?
Posted on: 2019/10/27 9:24
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Matatk Re: 89 vette misfires when at operating temperature
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SW Chicago Burbs
22792 Posts
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2008/1/7 0:00



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I'd say you're on the right track. Fuel pumps are known to fail and show the symptoms when they get warm. The erratic fuel pressure is a sign of that. I'd replace the pump and report back.
Posted on: 2019/10/27 14:32
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc.
1989 Corvette...RIP
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