97 bonneville stalls

[bigbass]

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?

[maxwedge]

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.

[jdq]

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

[sixsmiles]

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.

[Crunch67]

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>>>>

[bigbass]

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.

[markwb]

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

[bigbass]

Originally Posted by markwb

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?

[markwb]

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

[yakyak]

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.

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

Thanks

[bigbass]

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.

[sixsmiles]

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.

[wmrichards]

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.

[markwb]

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

[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.