95 pontiac bonneville long start - Page 3 - 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 09-04-2014, 08:03 AM   #21
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Cracking the throttle a little seemed to make a difference it would crank back up faster tand didn't stall out when I let off the gas. When cranking it for the first time This morning it seemed to cough a little and it threw the check engine light that'* the first time it'* done that. I am going to get me a pressure gauge to check the fuel pressure at this time I'm not sure what the pressure is.

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Old 09-04-2014, 12:04 PM   #22
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do you have a obd1.5 scanner? know anyone that can get the code? i would get the code then clean the iac and where it seats in the TB and disconnect the battery. its good to know the fuel pressure too.
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Old 09-06-2014, 09:05 PM   #23
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do y'all think it could be the fuel pump relay ???
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Old 09-06-2014, 10:23 PM   #24
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I doubt the relay. Either they work or don't work. Not when they want to.

Give this thread a read, you might be a candidate for it.

https://www.gmforum.com/electrical-1...1999-a-303224/
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Old 09-07-2014, 06:31 AM   #25
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I don't have any other problem with the car other than hard to crank after it has been driven a while. It idle fine doesn't stall out nothing electrical all windows and lights work great. And first thing in the morning it will crank immediately but after it has been driven or cranked for 10 minutes it is very hard to restart but even then once it does crank it runs great.
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Old 09-07-2014, 03:15 PM   #26
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Do you know what the fuel pressure is yet?
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Old 09-08-2014, 07:15 PM   #27
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Key on ignition off the fuel pressure is zero. When it cranks it'* holding at 42lbs of pressure.
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Old 09-08-2014, 09:22 PM   #28
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It should be as soon as you KO, the pump will turn on for 2 seconds. Then when you start cranking, the pump should come back on.

But if 42psi is what you get either way, your pump is "fine".

So, lets get back to basics. An engine needs 3 things to run. Air, fuel and spark. We know we got air. But is the fuel actually being delivered to the cylinders? Best way to test for spark....hold a wire. No don't do that. Just take a plug out and use the ground method. While its out, check to see if its wet with gas.
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Old 09-09-2014, 12:53 AM   #29
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I got spark and the engine runs great once it has been cranked up just very hesitant to start after it get hot and is turned off. I think the problem could be with the pump not building pressure until I start turning the engine. I think it should build up to 42 or at least have some pressure with the key on before I ever start turning the car over and for some reason it'* not , it'* almost like it'* losing prime when it'* hot. I will check in the morning when everything is cool and it usually cranks right up and see what the pressure is with the key on but not crunk up.

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Old 09-09-2014, 08:43 AM   #30
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Not holding the pressure is normally a function of the fpr. Any little leak will bleed the pressure off too
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