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Mass Air Flow sensor. Used to measure the amount of air entering the intake. This sensor works by heating an element and then measuring the rate of c...
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damien89 89 vette misfires when at operating temperature
53 Posts
Member since:
2010/6/19 21:57

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
SW Chicago Burbs
21861 Posts
Member since:
2008/1/7 0:00

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

1989 Corvette...custom 383 stroker, superrammed and cammed, built trans with PeteK 2800 stall. Mustang dyno results: 336 rwhp / 419 rwtq.
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