C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

85 issues..or gremlins

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Old Jan 6, 2021 | 10:29 AM
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Default 85 issues..or gremlins

so having some gremlins, on start fires up with an ungodly moan for about 2 3 seconds, could it be the torque converter? then idle issue after its warmed up ill sit at a light and the rpm will drop to almost stalling and then right back to normal, replaced the IAC and cleaned the TB, also check tps its at .55...im scratching my head, and finding jesus at the same time., sorta...lol.anybody got a direction maybe?
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Old Jan 6, 2021 | 11:39 AM
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Originally Posted by 85vegasvette
so having some gremlins, on start fires up with an ungodly moan for about 2 3 seconds, could it be the torque converter? then idle issue after its warmed up ill sit at a light and the rpm will drop to almost stalling and then right back to normal, replaced the IAC and cleaned the TB, also check tps its at .55...im scratching my head, and finding jesus at the same time., sorta...lol.anybody got a direction maybe?
Moan could be powersteering, they tend to make noise at startup when they're on their way out or really low on fluid. The dropping idle makes me think air leak that the ECU is trying to compensate for, if you have a scanner your BLM will be a telltale.
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Old Jan 6, 2021 | 09:47 PM
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Fan is stock, has a starter about 5k on it..battery new, when cold it fires nice...press the peddle it stumbles, after about 150 degrees its smooths out but still has that idle lurch is still there, Injectors are about 1k..so I keep on chasing...lol..thanks for the help..anymore keep em.coming ill try it
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Old Jan 7, 2021 | 04:28 AM
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Originally Posted by 85vegasvette
Fan is stock, has a starter about 5k on it..battery new, when cold it fires nice...press the peddle it stumbles, after about 150 degrees its smooths out but still has that idle lurch is still there, Injectors are about 1k..so I keep on chasing...lol..thanks for the help..anymore keep em.coming ill try it
Hi
Check your EGR exhaust gas recirculating valve is not jamming open, that will cause the car to stall.
If your EGR opens and closes freely you will need to check for any intake gasket leaks, or if the throttle body stop screw had been adjusted do a base idle adjustment setup.

Cheers
Gerard

Last edited by gerardvg; Jan 7, 2021 at 04:29 AM.
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