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

Help me with this clue regarding my stalling problem.

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Old Jul 14, 2010 | 10:49 PM
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Default Help me with this clue regarding my stalling problem.

When my 91 6speed is driven until full operating temperature then shut off for about 15 minutes. when I go to restart it will begin to fire but then stalls. Here is the clue. I had the climate control on Auto and it was stalling. I hit the off button and it started. What I don't understand is that it did the same thing when I had low freon so the compessor wasnt engaging.

The other issue I have is when the air is on and I am coming to a stop, I push in the clutch and the RPMs drop off to 500-600 then it stalls. It will start right back up.

What the heck is going on here?
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Old Jul 15, 2010 | 09:19 AM
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Second issue sounds like the IAC is slow to respond and not catching the drop to idle rpm's. Just a guess, it could be other things as well.
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Old Jul 15, 2010 | 03:27 PM
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Originally Posted by BADDUCK
Second issue sounds like the IAC is slow to respond and not catching the drop to idle rpm's. Just a guess, it could be other things as well.
I replaced the IAC but that didnt solve it. That is the first thing I thought of too.

Thanks,
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Old Jul 15, 2010 | 03:35 PM
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Have you tried to pull any codes or check the fuel rail pressure?

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Old Jul 15, 2010 | 04:29 PM
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Originally Posted by engle1147
Have you tried to pull any codes or check the fuel rail pressure?


No codes and fuel pressue is fine.

Does the air on or off affect the idle rpm's through a sensor of some type?
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Old Jul 16, 2010 | 09:06 AM
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If you jump "A" and "B" on the ALDL connector(key on), can you hear and feel the IAC trying to close ?
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Old Jul 16, 2010 | 12:21 PM
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Originally Posted by AGENT 86
If you jump "A" and "B" on the ALDL connector(key on), can you hear and feel the IAC trying to close ?
I will check first chance I get.
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Old Jul 16, 2010 | 01:39 PM
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mine did exactly this when my head gasket blew.

does it get really hot, like bubble over.
overheating issues?
Does the AC pulley free wheel when it is not engaged?

And yes, the car compensates for idle rpm no matter what. it is always trying to hit the target range. Ac on, rpms drop for a second, IAC opens up to bring the rpms back up.
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Old Jul 16, 2010 | 02:50 PM
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Originally Posted by bill mcdonald
mine did exactly this when my head gasket blew.

does it get really hot, like bubble over.
overheating issues?
Does the AC pulley free wheel when it is not engaged?

And yes, the car compensates for idle rpm no matter what. it is always trying to hit the target range. Ac on, rpms drop for a second, IAC opens up to bring the rpms back up.
It ran a bit hot before I had the air fixed and only one fan was running. It does not over heat now. I bought a new Auto Zone IAC. Could that be the problem?
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Old Jul 19, 2010 | 01:33 PM
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Originally Posted by RED UFO
It ran a bit hot before I had the air fixed and only one fan was running. It does not over heat now. I bought a new Auto Zone IAC. Could that be the problem?
it is a start.
Put it in, but I would spray a little throttle body cleaner in the AIC hole.

then you have to reset the idle speed.

then see what happens.
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