Engine Stalls after WOT
#1
Staging Lane
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Engine Stalls after WOT
My '98 Z28 seems to be stalling after wide open throttle. I get on it (to high RPM), then depress the clutch and release the accelerator to coast and slow down. The RPMs understandably drop, but drop too far and the engine stalls. I have to dump the clutch or restart the ignition to get going again. This has happened a few times.
Also, at idle, occasionally the RPMs would drop and almost stall - the interior and head lights would dim, but the engine would still run.
I did get my computer reprogrammed by ls1speed inc. I don't know exactly what they did, but I didn't really notice this issue until the reprogramming AND after the car sat unused for 3 months. Any ideas?
Also, at idle, occasionally the RPMs would drop and almost stall - the interior and head lights would dim, but the engine would still run.
I did get my computer reprogrammed by ls1speed inc. I don't know exactly what they did, but I didn't really notice this issue until the reprogramming AND after the car sat unused for 3 months. Any ideas?
#2
I would check out the fuel pressure regulator...thats what happened with my old car took it in they pulled 1 hose off it and said yup it's the FPR they are like 80 bucks....
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Staging Lane
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It's got 56k on it, not really high miles I'd say.
Pardon my ignorance, but what's an IAC?
And where's the FPR? In the fuel pump itself? Or in the engine bay?
Pardon my ignorance, but what's an IAC?
And where's the FPR? In the fuel pump itself? Or in the engine bay?
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IAC= Idle Air Control solinoid. It allows more or less air to bybass the throttle blade on the top of the tb.
The fuel pressure regulator is in the tank on the return line.
You can up the idle some and tweak with the IAC tables to smooth that out.
The fuel pressure regulator is in the tank on the return line.
You can up the idle some and tweak with the IAC tables to smooth that out.
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Don't get Edit if you get programming software. Get HP tuners. I believe this is the software speed inc uses and you can work off of their tune and just fine tune a little. I am in the same boat so I know how you feel.
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#10
Staging Lane
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hmmm this will be interesting. I'll give it a whirl this weekend. Sounds like the easiest fix is adjusting the idle. Drilling the hole will be plan B.
I also am going to check the sensor output voltages. Is there a site or list somewhere that contains nominal voltages for sensors? Such as the air temperature, IAC, etc?
I also am going to check the sensor output voltages. Is there a site or list somewhere that contains nominal voltages for sensors? Such as the air temperature, IAC, etc?
Last edited by z28dan; 04-01-2005 at 10:03 AM.