Return to the Cars Forum | Post a Follow-Up

 o
mechanic can't find the problem

Posted by susie100 (My Page) on
Mon, May 7, 07 at 11:30

I have a 2001 Pontiac Bonneville. The engine has begun to shut off while I am driving, usually around 40-50 MPH. It began last fall, very intermittently, but it has become more and more frequent. At first, I could steer to the side of the road and start it right back up. Now it doesn't want to start at all after shutting off. Nothing shows up on the computer. The mechanic first thought it was the fuel pump, but now is not so sure. Anyone have any thoughts about what it could be? Thank you so much.


Follow-Up Postings:

 o
RE: mechanic can't find the problem

I had a car with the electronic ignition pack doing that. Factory bulletin about it even.
Quite a costly thing as the dealer couldn't repair it for free unless he could experience the failure while in the shop to asscertain it was one of the bum ones.

I'm greasy under my fingernails occasionally so I just bought all new aftermarket distributor & ignition - it was crazy, coasting to the side of the road during rush hour everyday in the same general area.


 o
RE: mechanic can't find the problem

That's a tuffy. Pretty hard for a mechanic to find a phantom problem like that. Could be a lot of things and good mechanics really don't like to throw parts at something and hope for the best.

Does everything quit like the radio, ac/heater fan, ect, or just the engine? Do all the idiot lights come immediately when this happens? If everything quits, it makes me suspicious of something like the ignition switch or related wiring and connections. Most of the time when a componant fails, the check engine light comes on and sets a code. I suggested the ignition switch because if that fails, the computer might think you just turned the engine off. Just an idea. If a mechanic looking at it can't see the problem, computer land people sure can't. Though it doesn't sound like it, the best thing that could happen at this point is if it would die and stay dead. Then someone could zero in on it. Good luck with it.


 o
RE: mechanic can't find the problem

I'd check out the ignition module. GM has had some tricky ones in the past. It may stop working or trigger at the wrong time after the module exceeds a certain temperature, and then begin working again after cooling off a bit. Its hard to anticipate under what conditions will cause this particular sensor to fail because of many variables. Road draft and air currents under the hood affect the sensor's temperature. Some conditions where you may expect failure:
1. Creeping or sitting in slow traffic.
2. Pulling a long hill at less than 35 mph.

It works ok at cold startup. Only fails after it heats up.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Cars Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here