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Old 06-18-2011, 07:11 PM   #1
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Question 1984 Corvette Rough idle

1984 Corvette that'* been converted to a 1986 Tuned Port Injection, converted the ECS and all the wiring. The engine idle varies as much as 200 RPM, but usually closer to 100 RPM.
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Old 06-18-2011, 07:14 PM   #2
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Welcome to GMF! Sounds like a vacuum leak. Check all the vac hoses for cracks, or bad gaskets. If its not that, it could be spark plugs or wires getting bad.
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Old 06-18-2011, 07:18 PM   #3
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engine was rebuilt, all vacuum lines are new, plug wires new, everything.
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Old 06-18-2011, 07:28 PM   #4
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hmm. What about the fuel pump and filter, are they new as well?
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Old 06-18-2011, 07:46 PM   #5
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Yes, but that TPI is used along with the fuel pressure regulator. I seems fine at anything above idle, also, no codes. Could there be something with the fuel pressure regulator?
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Old 06-18-2011, 07:58 PM   #6
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Thread moved into appropriate section for better visibility.
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Old 06-18-2011, 08:26 PM   #7
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test the fuel pressure but a rough idle is generally a vacuum leak i would b checking for gasket leaks worked on a 73 vette that had a loose intake manifold. do you have a idle air control on the throttle body?
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Old 06-18-2011, 09:18 PM   #8
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Yes and it'* been changed.
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Old 06-18-2011, 11:51 PM   #9
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i cannot recall does it have a MAP sensor..i actually think tpi is a MAF in the intake tube?
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Old 06-19-2011, 01:18 AM   #10
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yes it does and it'* in the tube.
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