WHILE DRIVING DOWN THE ROAD THE ENGINE SUDDENLY ...

  • Tiny
  • 1984E23
  • 1984 BMW 733i
  • 145,000 miles

While driving down the road the engine suddenly stops running. Each time I try to start the engine runs for 1 or 2 seconds and the stops again. After several tries the engine keeps running. I have noticed that after the car has been running for a while and I stop the RPM fluctuates up and down. The engine suddenly stopping is comming more and more frequently.
Thank you,
Ray.

Tuesday, December 18th, 2012 AT 4:02 PM

6 Answers

  • Tiny
  • merlin2021
  • Expert
  • 17,583 posts

Check fuel pressure.

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Tuesday, December 18th, 2012 AT 4:52 PM
  • Tiny
  • 1984E23
  • Member

The fuel pressure is fine. We also recently changed the fuel filter. I think it is something electrical. This BMW has alot of electrical components, I probably need a response from someone that is familiar with older BMW's and familiar with the electrical components and which one would cause these symptoms.

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Wednesday, December 19th, 2012 AT 1:06 AM
  • Tiny
  • merlin2021
  • Expert
  • 17,583 posts

Does it only happen on deacceleration and idle? Or all the time?

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Wednesday, December 19th, 2012 AT 8:33 AM
  • Tiny
  • 1984E23
  • Member

It happens mostly at in town speeds and idle. Generally runs fine at highway speeds.

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Thursday, December 20th, 2012 AT 12:30 AM
  • Tiny
  • merlin2021
  • Expert
  • 17,583 posts

Have you checked throttle body, and IAC? Clean all ports of carbon? And PVC system is a biggie, dry rot of vacuum hoses and PCV gasket.

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Thursday, December 20th, 2012 AT 8:42 AM
  • Tiny
  • Dr. Hagerty
  • Expert
  • 9,713 posts

I agree with Merlin. The items on his list need to be checked and eliminated from the equation. I also have some input as to the idle air control, it is usually quite robust on that car and I have not seen them fail, however, diagnosis of that system would start with checking for power at the IAC valve/connector and resistance at the IAC valve. With the key on and the engine off, the valve should be felt to vibrate, if not, you have a problem with the IAC, let us know what you come up against mate.

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Saturday, December 29th, 2012 AT 11:45 PM

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