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-   -   94 740 - car loses power and stalls while driving. Happens randomly (http://www.bimmerfest.com/forums/showthread.php?t=635318)

rangelic 07-25-2012 03:32 PM

94 740 - car loses power and stalls while driving. Happens randomly
 
Hi Folks. This is my first post, so be kind if I break any rules. :) This issue has been happening for some time but has recently increased in frequency. Initially, it seemed to happen if the gas gauge went below 1/4 tank. Simple solution, keep the tank filled. Then it happened at 1/2 tank and now with more than 3/4. So, not likely it's related. This is what I have observed during and after a stall. Usually happens on the highway (60 - 80mph). Feels like it loses power then comes back 5 or 6 times every second or so and then it stalls while the car is still in motion or sometimes I can get it to the side of the road while it chugs and then it dies. Check engine light comes on. Car may start and allow you to move 10 - 20 yards and then dies again. After that, it will not start again until one of the following occurs. Disconnect/reconnect the battery or let it sit for a period of time (usually an hour or two). I am aware that I have a battery issue. It still turns over the car (feels very tired) but needs to be replaced. I cant imagine that it is related but I am going to replace it to take it out of the equation. Really feels like the car is out of gas when this happens ( I have run out of gas before and it really feels the same). Items I suspect are fuel pump (or fuel pump connection), fuel filter (Does anyone know where it is located), fuel pump relay. Does not feel electrical (but I really don't have a clue).

One more thing. The last time it died, there was a trans fault of some kind on the display but that is gone now and I have not seen it since (but have not driven it much either).

Any help would be greatly appreciated.

02540ico 07-30-2012 07:37 AM

Looks like you're headed in the right direction. A bad battery will cause all kinds of problems. Disconnecting the battery wouldn't help a plugged fuel filter so that's likely OK. Almost sounds like the relay or pump itself is getting hot and shutting down.

TerryY 08-02-2012 05:04 PM

My 740 did that and the cause was the crank position sensor.


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