While driving down the road the engine suddenly.

1984E23

MEMBER
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.

6 Replies

MERLIN2021

MECHANIC
17,250 POSTS

Check fuel pressure.

Was this

answer

helpful?

Yes

Tuesday, December 18th, 2012 AT 4:52 PM

1984E23

MEMBER
3 POSTS

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.

SPONSORED LINKS

Was this

answer

helpful?

Yes

Thursday, December 20th, 2012 AT 8:42 AM

DOCHAGERTY

MECHANIC
9,601 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.

Was this

answer

helpful?

Yes

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