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Old 9th July 2010, 08:50   #1
CarbonHan
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My car will turn on but dies instantly right after

Hello all

Here are the specs of my car
110000 miles
2002 m5

I drove my car to a local restaurant and parked
ate some food then came back out to go home

I turn my car on and then it dies. I've tried a lot of times to start it but no luck

I've tried disconnecting the battery for like 5 minutes with no luck
what could the problem be?? Thanks in advance
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Old 9th July 2010, 08:53   #2
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Does it actually fire and then cut out? Could be something like an immobiliser problem. have you got a spare key you can try first before getting it looked at?

cheers
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Old 9th July 2010, 08:56   #3
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My car will fire but it dies right away..I've tried both keys so it's probably not that.
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Old 9th July 2010, 09:30   #4
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Can you keep it going by giving quickly tapping the gas pedal a lot?
And if you can keep it running, does it sound really really rough?
I once had this and it turned out to be a duff MAF.
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Old 9th July 2010, 10:39   #5
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Get under the car, by the US Passenger side rear seat, and start hammering on the fuel pump/tank lightly but hard

See if that changes anything.

Good Luck
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Old 9th July 2010, 10:55   #6
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Quote:
Originally Posted by M5 London View Post
Get under the car, by the US Passenger side rear seat, and start hammering on the fuel pump/tank lightly but hard

See if that changes anything.

Good Luck
That's an intriguing description Kumaran......
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Old 9th July 2010, 14:01   #7
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even if i step on the gas nothing happens... does that rule out anything fuel related?

the thing that frustrates me the most is that the beast was running perfectly fine the whole day. i didnt even know something like this could happen so suddenly....
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Old 9th July 2010, 14:20   #8
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Do you have a half tank of fuel or is it below that? To rule out the siphon fuel pump and the secondary tank fuel sender, add 4 gallons of gas and see if it will run.

To determine fuel levels in each of the tanks, go to the "secret menu and run test 14 (I believe ) and report back.
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Old 9th July 2010, 16:27   #9
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sounds like a bad crank sensor.
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Old 9th July 2010, 17:44   #10
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My vote is for MAF(s) going bad also... I've had this happen to me a couple of times. When the engine is hot especially in hot weather, even though the car has been running perfectly before stopping, when you come to try to restart it it fires up but then dies instantly. If you disconnect the offending MAF(s) the engine starts and runs. Replacing the MAF has fixed the problem for me (until the next time). I say MAF(s) because the first time it was both MAFs, the second time just one.
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