Car immediately shutdown while starting

[dkl]

Has anyone ran into this issue where the car would immediately shut off while trying to start it? It cranks, but when the car is about to turnover, the motor shut down. This happened while I'm still holding the key in the start position - as if power was cut to the starter for some reason. Turning off the ignition and restarting again fires it right up on 2nd try. This had happened 3 to 4 times in the last week. Any ideas what may cause this? Ignition switch, may be? Thanks.

[andrewwynn]

The symptom you describe often ends up being the ignition key switch


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[srmmmm]

I had the exact same problem - new key eliminated it. Remote locking / unlocking had also stopped working.


2002 X5 3.0 359,000 miles
2014 428i 63,000 miles


2004 325i sold at 123,600 miles
2001 325i sold at 66,000 miles


1970 Firebird Under restoration

[dkl]

Thanks for the quick response. Anyone have inputs on going Genuine or Aftermarket on the ignition switch? The Febi part is almost half the price of the BMW branded part!

[andrewwynn]

Try your other keys. If the wrong solder joint fails you can't start the car. Reflow can fix ask my how I know.

[dkl]

Thanks guys - I'll give the other key a try before ordering a new ignition switch. FYI - the current key functions perfectly fine - open/close doors/hatch without issues.

[andrewwynn]

The starting circuit uses different traces than the remote functions

BOTH of my keys needed solder reflow to get the remote functions working

The start function still worked in my case but the problem would be from the same cause: broken solder joint


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[dkl]

Well...it doesn't look like it's the key. Tried my other fairly unused key (the one that's only been used once every 3 months or so just to get the battery charged), and the same issue still occur. So, I'm going to order the genuine BMW ignition switch. Hopefully, that's the cause.

[andrewwynn]

Historically the odds are in your favor

[Oldmactech]

Try disconnecting the MAF sensor connector.


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