LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Car idles rough and wants to die when warm

Old 08-13-2008, 02:03 PM
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Car idles rough and wants to die when warm

I have been having a problem lately with the car in sig. It runs fine when cold but when it warms up it idles a little rough and when sitting parked it starts to bog and dies. I think Its fuel pump related because I can here the pump "walbro 255lph" its loud when the problem is not present but when the problem accurs and I turn the key on I can barely here it run. The pump is only a year old with about 5000 miles on it. I am not getting a SES and it has a new fuel filter, any thoughts?
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Old 08-13-2008, 04:25 PM
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anybody?
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Old 08-13-2008, 07:06 PM
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Well I hot wired the pump and it is running but Its very quiet. When I first installed the pump it was way louder. This leads me to beleive the pump is on its way out.
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Old 08-13-2008, 10:45 PM
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well what press. does the fuel system have? also its normal for th efuel pump to only cycle on for 2 seconds with the key on, and the engine off. thats proly why you dont hear it when the engine dies.

also its normal for the pumps to get a little less noisey after there broken in and run for a while.
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