95 Bonneville Non super charged - 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 07-21-2011, 02:07 AM   #1
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Default 95 Bonneville Non super charged

New to site. Need help with 95 Bonneville. 206K miles Car was given to me almost one year ago. Has ran great until last night. Car chimes and says check gauges like it does when I am low on fuel, however I had just filled up the night before. 1/2 mile down the road it shuts off and won't start. It will turn over but will not catch. Wait 2-3 minutes and car starts and runs for 10-15 seconds. Touch the gas pedal and it dies. Tried this several times over the next 15 minutes. Finally car doesn't die when I hit gas and I make it to my inlaws about 1 1/2 miles down the road. It doesn't want to run for more than a minute at a time now. Was hoping a clogged fuel filter but new filter didn't help. What should my next move be? Fuel pump? Do I have access to my fuel pump through the trunk/back seat or will I have to drop the whole tank? I hope I don't have to drop the tank as it is full of fuel and I don't have anyway of draining or storing gas. Any help is appreciated. Please be as blunt and plain as possible as I have thick skin don't rattle easily. This is the wife'* car and I just need to get it back on the road.
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Troy.
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Old 07-21-2011, 08:04 AM   #2
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First, test the fuel pressure, you want about 48psi with key on engine off. And around the same when running. If lower then that then the pump is going out. You will need to drop the tank to change the pump.
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Old 07-21-2011, 08:20 AM   #3
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Thank you Sir. I will test and let you know.
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Old 07-21-2011, 08:21 AM   #4
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that ground or that connector back there can make it feel like the pump is going out too, make sure those are good
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Old 07-22-2011, 01:10 AM   #5
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Well... father in law ended up accidentally leaving key in car on the on position all night and the Bonneville was dead this morning. After charging the battery the car has started and ran at idle for up to 30 minutes three times. I've thrown on the ac, radio, lights to put a load on it and it ran great. I put the gas to it several times and held it at 2500 rpm'* and it ran great. Still not ready to take it out on the road due to how hot it is here. Over 100 degrees today. I stopped and bought a Haynes book but the relay info and pictures they show are not the same as my car. I'm not sure which relay is for the fuel pump. We've disconnected them all and put them back and now I'm wondering if by letting the battery go dead is it possible that the "computer" or electrical system, relays or whatever you want to call it has reset? Does anyone have a decent picture or diagram of the 95 Bonneville relays? Not sure where to go from here. Thanks again for all your help and suggestions.
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Old 07-22-2011, 06:34 AM   #6
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Quote:
Originally Posted by XTroyX View Post
Well... father in law ended up accidentally leaving key in car on the on position all night and the Bonneville was dead this morning. After charging the battery the car has started and ran at idle for up to 30 minutes three times. I've thrown on the ac, radio, lights to put a load on it and it ran great. I put the gas to it several times and held it at 2500 rpm'* and it ran great. Still not ready to take it out on the road due to how hot it is here. Over 100 degrees today. I stopped and bought a Haynes book but the relay info and pictures they show are not the same as my car. I'm not sure which relay is for the fuel pump. We've disconnected them all and put them back and now I'm wondering if by letting the battery go dead is it possible that the "computer" or electrical system, relays or whatever you want to call it has reset? Does anyone have a decent picture or diagram of the 95 Bonneville relays? Not sure where to go from here. Thanks again for all your help and suggestions.
Thanks,
Troy.
OK. It'* just one opinion, which should be just one consideration for your troubleshooting, but I have a real thing about the ECM/PCM in the '95s. I have had my '95 SE, the far longest of the 3 Bonnes I have kept on the road, and it has proved to be an invincible brick. It has 210,000 mi and i have no reason, at this time, to believe it won't outlive me.

The car has liked to go through wheel hubs and headlight/twilight switches. But the rest has been few and far between, and stuff you would expect.

The disasterish problem was the one i mention in this post. And only because the PCM fooled me.

A lot of research told me which symptoms need to be checked at the PCM, before you go on a big chase on a '95. It'* $20-30 and can save a lot of time to have a spare.

The "mystery cut out" is the #2 on my list. #1 is the CE light, with a DTC for some failure in the ignition circuit.

I think I got the hint for the problem from 95naSTA(Mike). He has always been very savvy about how the PCMs are programmed. The real machine-level language stuff.

IMHO, the weakness in the '95 PCM is the result of a quicky work-around. The '96-'99 PCM have a complex set of Series-II work-arounds for spark/fuel/air issues. The '95 has one. I call it the "get you home alive" program. In the presence of a skewed value (and maybe a DTC code), the PCM just modulates everything to keep you from doing serious damage to the engine. It'* an incredibly inefficient running condition, but not a bad defensive idea.

The problem is that this program has a disruptive capability to the PCM, and you end up getting weird output from the PCM.

The dead battery, with things then kinda returning to normal, just smacks of the PCM.

FWIW.

https://www.gmforum.com/1992-1999-91/1995-bonneville-stalls-fixed-299708/page4/
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Old 07-30-2011, 03:58 AM   #7
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Just had a few months of issues with a 95 Bonneville SSE...Non supercharged.

It gave us about 10 different symptoms....Cleaned all grounds, and positive starter/battery cables...Then checked wiring.. then changed crank sensor.. then cleaned ground under ICM, then replaced ICM with junkyard modules, then changed coil packs, then changed TPS and IAF with junkyard replacements, then finally bought a new computer for $156 canadian, and a new AC delco fuel pump for 98 canadian...The car now runs and drives perfect! like new! I am betting it was the ECM!!!!!!!!, the whole time!
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