Ok, my car starts perfectly when it hasn't been driven for that day. It starts almost imediatly, but once it has warmed up, it takes like 3 seconds or longer to start, and then it kinda idles REALLY low for a sec then jumps up. like 200 then jumps to normal. why does it start perfectly when its cold but not when the engine is hot?

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88' GTA 350 MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass

 

Check for leaky injectors.

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

 

how do i check that?

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88' GTA 350 MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass

 

Hook up a fuel pressure gauge to the schraeder valve on the fuel rail and turn the ignition key to "ON" and listen for the fuel pump priming. Check the pressure reading and see if it drops to zero within an hour or so. If it does in this time frame, go through the diagnostic procedure in the service manual for isolating the leakdown culprit (e.g. - pressure regulator, pump check valve, injectors). Hope this helps.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley AFPR, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Ruger P95DC, hot wife, new oil filter, thick rubber floormats, no cats.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

yes, i finaly have a reason to buy a fuel pressure tester guage.

[This message has been edited by breathment (edited August 06, 2001).]

 

Check your timing too. Mine did that too, it was the starter (weak).

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1992 Camaro Z-28 5.7L auto t-tops arctic white

1967 Pontiac Catalina 2 door fastback 400 v-8 auto cameo white dark red interior