My 1997 runs for about 15 minutes then jumps like crazy, the tach drops like you turned the key off then jumps around until the engine finally dies. Sometimes it will restart immediately but other times it takes a couple of minutes. Its getting fire but no fuel when this happens. Ive replace the plugs and wires, 4 of 6 injectors, ignition control module, computer, fuel pump and filter (twice just in case I bought a bad part) fuel regulator and the fuel pump relay. Running out of options, should i try the crank position sensor or the oil pressure sensor?

:banghead: :banghead: :banghead: :banghead: :banghead:

When it won't start do you have spark at all the plugs? Check for injector pulse with a noid lite, see what you get post back.

How do you know there is no fuel did you check fuel pressure.

I am struggling with a very similar issue on a 95 Bonneville. I was able to recreate the problem by disconnecting and touching the negative ground next to the battery. I have not been able to fix the problem by cleaning the stud bolt post but am following that circuit to see where I could be loosing ground. Please post any solution that you find.:banghead: :banghead:

Having same problem with 94 SSE, went as far as to replace the engine with a remanufactured one, problem still exsists have replaced almost all the mechanical parts, the engine guy is also baffled, last resort (and it's come to this) is to have the dealer run a comprehensive diagnostic, we believe it is somewhere in cpu bank, and this seems to be a common bonneville problem that is driving a bunch of us nuts, so you are not alone. If anyone comes up with a solution please shout it out!!!!!! If I get an answer from the dealer I will be sure to post it IMEDIATELY>>>>

UPDATE!!!!!! I might be a little premature, but I replaced the crank sensor AND the oil pressure sensor and I believe one of them was the culprit. At least I made it to work and back today with no problems. Haven't been able to do that in months. (50 mile round trip) Hope it helps someone.

I'd have to say it was the crank sensor failing. The oil pressure sensor being faulty shouldn't make the engine stall

I'd have to say it was the crank sensor failing. The oil pressure sensor being faulty shouldn't make the engine stall

The oil pressure sensor failing will kill the fuel pump. NO?

Oil Pressure Sensor failure cutting power to fuel pump, not to my knowledge, honestly.

I have a very similar problem with a 98 Bonneville with non-super 3800. The engine will hunt at idle. Most of the time it will run just fine, but sometimes it
appears as if the engine was shut off for a moment. It will misfire under load and will sometime shut off while comming up to a stop. This seems more accute while going around a corner at slow speed, but this could be caused by increase power steering load on a mis-firing engine.

The computer sets a code for cylinder 6 mis-fire - sometimes, but not often.
No other codes are ever set. Have replaced the #6 ignition coil, all spark wires, all plugs, all fuel injectors. Also replaced the IAS and cleaned the IAS ports. Had the intake manifold gasket replaced about a year ago for the coolent leak problem.:banghead:

I am on the verge of removing the head and looking for a bad value. Then I read the possibility of crank position sensor.:naughty: Also read in another forum about grounding on the coil block being bad. Anyone have any ideas where to go from here?

Thanks

yakyk, not too sure our problems are the same. my car would run fine for 10 or 15 minutes then it would just die or it would hesitate for a few miles then die. After replacing several high dollar parts, I ran low on options and relaced the crank sensor and the oil pressure sensor (total for both=43.00) I still dont know exactly which part did the trick but I'm happy as i could be.
MARKWB-- I'd look further into the oil pressure sensor, I'm not saying that is what fixed it, but I'm pretty sure it will kill the fuel pump.

I worked on my 95 for a month, was ready to scrap the car... then I finally found a bad engine ground. The original engine ground was intact and looked fine, but when I checked Engine to frame resistance it was several mega ohms. I ran a new 16 gage wire from a secure nut on the engine to a front cross member bolt... front H frame. ALL PROBLEMS SOLVED!!!! The resistance from the engine to the frame was 1.6 Ohms.

I have the same problem with my '97 Bonneville. My mechanic has being trying to fix this problem for more than 3 years. Today 5/31/2006 I finally got the car to stall with him driving and his computer hooked up to the code terminal; so hopefully we would be able to solve this problem.

wm, Hope you get it resolved, please let us know. thank you.

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.

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.

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.

:evillol: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.

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.

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.

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

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.


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............?

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.

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.

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