1984 Corvette Rough idle
1984 Corvette that's 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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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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engine was rebuilt, all vacuum lines are new, plug wires new, everything.
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hmm. What about the fuel pump and filter, are they new as well?
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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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Thread moved into appropriate section for better visibility. :thumbup2
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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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Yes and it's been changed.
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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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yes it does and it's in the tube.
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