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

Flooding issue.

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Old Sep 1, 2009 | 12:02 PM
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Default Flooding issue.

Hey everyone, just had a question to see if anyone could give me some insight. I have searched but not come up with anything really. I have a 92 Lt1 Car. The car is dumping fuel like crazy. It will startup, but wont hold an idle unless you put your foot on the gas and even then it doesnt sound great. After a while it wont start at all cause it fouls out the plugs. I have replaced the injectors, pcm, plugs obviously and still having this issue. No codes come up on my scanner. Any ideas?

Last edited by NSVette85; Sep 1, 2009 at 03:45 PM.
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Old Sep 1, 2009 | 03:45 PM
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Also swapped in a good MAP sensor, didnt change anything. Pulled the IAC, cleaned it up, it doesnt move much when u turn the ignition on, but if you ground the test pin in the aldl it extends 100%.
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Old Sep 2, 2009 | 10:44 AM
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You could check the coolant temp sensor
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Old Sep 2, 2009 | 10:52 AM
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Coolant temp sensor is showing the proper temp on my scanner and unplugged it doesn't make it any better
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Old Sep 2, 2009 | 03:20 PM
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Look for fuel in fuel reg vacuum line, you may have a ruptured diaphragm.
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Old Sep 2, 2009 | 03:32 PM
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Originally Posted by AGENT 86
Look for fuel in fuel reg vacuum line, you may have a ruptured diaphragm.
If he does then won't it have low fuel pressure instead of high? How would that make it foul out?

Are all the injectors working? How is their resistance?
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Old Sep 2, 2009 | 03:40 PM
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Originally Posted by aklim
If he does then won't it have low fuel pressure instead of high? How would that make it foul out?

Are all the injectors working? How is their resistance?
the injectors are brand new. I can only test them at 1000rpm and they are all really bring and seem to be flashing but its tough to tell at that engine speed. No signs of fuel in the regulator vacuum hose. Car has 42psi KOEO and with it running it has about 38-40. Without keeping it running by playing with the throttle it dies out. Sounds ok for the first 2 seconds its on then it dies. It smokes like a bitch and smells like gas bigtime when we keep it running at around 1000 rpm. With the MAP unplugged it will stay on unassisted but runs at 1500rpm and doesn't sound great.
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Old Sep 3, 2009 | 12:36 AM
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Originally Posted by aklim
If he does then won't it have low fuel pressure instead of high? How would that make it foul out?
Who said it was high ?? ECM can't control how much fuel is being sucked past a ruptured diaphragm, the result could be an extremely rich condition.
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Old Sep 3, 2009 | 11:04 AM
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Originally Posted by AGENT 86
Who said it was high ?? ECM can't control how much fuel is being sucked past a ruptured diaphragm, the result could be an extremely rich condition.
Hmm ya the pressure seems right on point. I am working on it again today so any more suggestions would be appreciated.
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Old Sep 3, 2009 | 01:26 PM
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The dealership had said that the ECM was at fault. I sent the ECM out to be repaired and got it back with the same issue. I don't know if i should think the dealer was at fault in their diag, or if the repair was unsuccessful. I don't have any codes and i can view engine data. the ECU was a re-manufacturer in the first place.
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Old Sep 4, 2009 | 10:38 AM
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Whats the likleyhood of the IAC causing this? It is at 160 on my scanner when we have the car running and it is cold
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Old Sep 4, 2009 | 11:57 AM
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Originally Posted by VetteUndercar
Whats the likleyhood of the IAC causing this? It is at 160 on my scanner when we have the car running and it is cold
Dunno. What is it when the car is up to speed and in closed loop?
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Old Sep 4, 2009 | 12:53 PM
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Ok i swapped out the IAC. The car now actually was able to hold an idle, but it was running like ****. Smoking bad cause it was running rich as hell. After about 5 mins it died out and wont restart because the plugs are fouled. Maybe the IAC was bad and that's what killed the PCM in the first place?
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Old Sep 4, 2009 | 12:55 PM
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Originally Posted by VetteUndercar
Ok i swapped out the IAC. The car now actually was able to hold an idle, but it was running like ****. Smoking bad cause it was running rich as hell. After about 5 mins it died out and wont restart because the plugs are fouled. Maybe the IAC was bad and that's what killed the PCM in the first place?
Even if you swap it out, you still have to adjust it. At least that is what I would do in 91.
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Old Sep 4, 2009 | 01:08 PM
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Originally Posted by aklim
Even if you swap it out, you still have to adjust it. At least that is what I would do in 91.
Yea i know i need to do the adjustment procedure, thats why the idle is hunting from like 500-1500rpm. But that doesnt explain why the car is dumping fuel like crazy still and making it smoke/foul the plugs out.
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Old Dec 8, 2019 | 04:36 PM
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Originally Posted by NSVette85
Yea i know i need to do the adjustment procedure, thats why the idle is hunting from like 500-1500rpm. But that doesnt explain why the car is dumping fuel like crazy still and making it smoke/foul the plugs out.
mine is doing the same thing and I have already replaced temp control sensor made no difference
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Old Dec 8, 2019 | 06:46 PM
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Originally Posted by Vance troxell
mine is doing the same thing and I have already replaced temp control sensor made no difference
10 years ago the guy changed his tps and sold the car. Now driving a C7Z.
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