97 bonneville stalls

[richtazz]

The oil pressure switch will kill the fuel pump, so that could be a cause of a stalling issue. The crank sensor is a known problem and since your tach dropped before it died, I believe that was your issue bigbass. The engine ground strap problem is one of those that will drive you nuts, because many techs don't think to check it. They immediately go for the expensive parts that they can make money on.

[bnls143]

Have a 95 bonneville. It does not die. I drive it, leave it for a while and it simply wont start when I get back in it, It cranks but won't start. Replaced the battery still refuses to start when turned off, took it to a mechanice who said he couldn't find anything wrong when he ran the diagnostics, brought it home and it happened again. Also this may be stupid, but the power windows, seats don't work when car refuses to run , lights and windshield wipers work however.Sure don't have a;ot of money or anything, any advice. I read the other postings, my car doesn't die on me. It will run a day or so, then after i am driving a while and turn it off, it won't start again.

[bnls143]

Have a 95 bonneville. It does not die. I drive it, leave it for a while and it simply wont start when I get back in it, It cranks but won't start. Replaced the battery still refuses to start when turned off, took it to a mechanice who said he couldn't find anything wrong when he ran the diagnostics, brought it home and it happened again. Also this may be stupid, but the power windows, seats don't work when car refuses to run , lights and windshield wipers work however.Sure don't have a;ot of money or anything, any advice. I read the other postings, my car doesn't die on me. It will run a day or so, then after i am driving a while and turn it off, it won't start again.

[maxwedge]

You need to check if you have fuel pressure at the rail and/or spark when this happens, there a several possibilities here and basic diagnostics must be done to narrow the problem. It is possible the body ground under the l/s of the carpet near the front sill is bad, this could cause the seats and window problem, not sure on the 97 though whether this is tied into a possible fuel pump ground, do the basic checks first, see if you hear the FP run for 2 secs. when the key is first turned on.

[BNaylor]

Yeah, I see Maxwedge this thread on the issue of the oil pressue sending unit may be getting convoluted.

Can anyone say with 100% certainty that the oil pressure sending unit will inter-react with the fuel circuits and cut off the fuel pump operation for sure? I'd recommend reviewing a GM service manual for that respective year model Bonny before drawing any definitive conclusion.

[richtazz]

Yes Bob, the oil pressure switch on a 97 Bonne has a fuel pump cut-off.

[BNaylor]

Originally Posted by witsman

I had the same problem with my daughters 2000 Bonneville, stalling, dying ect.
We replaced the fuel reg. crank pos. sens. fuel pump. Guess what it was? mass air flow sensor!Problem solved. good luck.

Originally Posted by richtazz

Yes Bob, the oil pressure switch on a 97 Bonne has a fuel pump cut-off.

Thanks for the reply Rich although it took awhile.

I'm aware of what the '97 and you can add the '98 and '99 models have Rich. The issue I see is the last person to post before you owned a 2000 model (see quote above). I was more interested in getting clarification on the 2000 and up Bonnevilles since a few of those guys weighed in. Plus I was asked to help get this clarified by an AF member.

And the answer is............?

[richtazz]

Sorry Bob, I thought (as Max asked me in a PM) if you were just having issues finding it in a wiring schematic (I can't find it either). The 2000 uses a different sensor, and it is a 3 pin, but the computer doesn't label it as a fuel cut-off as well like the 92-99 model does. So for the 00-up, I cannot say for sure if the oil sender cuts fuel. Every other GM vehicle with an electric fuel pump does to my knowledge, so I don't see where the Bonnes would be different.

[BNaylor]

Originally Posted by richtazz

Sorry Bob, I thought (as Max asked me in a PM) if you were just having issues finding it in a wiring schematic (I can't find it either). The 2000 uses a different sensor, and it is a 3 pin, but the computer doesn't label it as a fuel cut-off as well like the 92-99 model does.

It is not a problem and thanks for weighing in. Between all of us maybe we can solve the mystery. The point Max raised was wiring diagram info is vague especially like AllData. I'm in the process of reviewing GM service manual data and consult a GM Tech. So far, like you found out none of the documentation shows a tie in electrically nor is there a wiring diagram that includes how the sensor works electrically to disable the fuel circuits. However, if you go by the GM's Parts data 92-99 model Bonnevilles to include other GM "H" body cars shows a Fuel Pump Switch/Engine Oil Pressure Gauge sensor, GM Part # 25627057.

The 2000 and up use a different oil pressure sensor as you mentioned and it appears there is no inter-reaction with the fuel pump circuits just like the GM "W" body cars.

If you or anyone else can get any confirmation data let us know so we can clear things up. Thanks.

[sixsmiles]

Did you ever resolve problem bigbass? Finally found low fuel pressure on my 95 even though I just replaced the fuel pump.