checking fuel pressure 94 3800 v6,? 10 psi ???? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-27-2005, 09:14 PM   #1
cvc
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Default checking fuel pressure 94 3800 v6,? 10 psi ????

:( Ok checking fuel pressure on a 1994 Lesabre 3800 when the gage is hooked up and key turned on pressure goes to 46 psi and after 2 or 3 seconds you hear a "click" from the EGR valve and pressure drops to 10 psi.Unhook EGR and it does the same thing.It doesnt drop slow it jsut drops real quick. Start car and pressure goes to 38 psi and stays while driving.Car seems to run rough at low speed 35mph thats why I was checking pressure. Any idea what the click noise is and why it drops so quick ?
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Old 01-27-2005, 11:27 PM   #2
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I'd say your FPR is leaking down when the EGR pops changing the intake pressure, so the FPR lets go. It'* off the wall, I know.
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Old 01-28-2005, 12:32 AM   #3
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"Key on"? Is that key on, without starting? The reason I ask is that the fuel pump will run for 2-3 seconds with key on, and if the engine is not cranked it will shut off. If you are not cranking, then perhaps what you are hearing is the fuel pump relay clicking off. Personally I have never heard that but I am just trying to apply some logic. I am guessing that maybe the reason for the quick drop in fuel pressure is a stuck open check valve at the fuel pump. Does this make sense to anyone or am I blowing smoke?
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Old 01-28-2005, 01:15 AM   #4
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I'm betting a bad FPR. It'* not holding pressure. But you're right about the timing thing. This likely has nothing to do with the EGR (not really possible, anyway), and is just a time issue.
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Old 01-28-2005, 08:12 PM   #5
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Quote:
Originally Posted by willwren
I'm betting a bad FPR. It'* not holding pressure. But you're right about the timing thing. This likely has nothing to do with the EGR (not really possible, anyway), and is just a time issue.
Yeah, I agree. EGR has absolutely nothing to do with fuel pressure.
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