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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 02-15-2011, 06:17 PM   #1 (permalink)
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Turns over and starts for 5 secs then dies

i have a 525i need help trouble shooting any suggestions?
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Old 02-16-2011, 07:50 AM   #2 (permalink)
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Hmmm when it does start does it have oil pressure? If it doesn't it may be the actual car turning itself of for protection...
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Old 02-16-2011, 03:46 PM   #3 (permalink)
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sounds like a vacuum pressure problem to me. The car isnt getting enough oxygen and is literally choking to death. What year is your 525?

I had an e34 535 that I replaced the headgasket on, and when I put the throttle body back on I did not notice it was cracked. This caused it to lose intake pressure and die pretty quick after startup. You can get a smoke machine to test if you have any holes in your intake system (but remember to open the throttle body flap when you test!)
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Old 02-17-2011, 02:25 PM   #4 (permalink)
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I'm not familiar with the 5 series, mines a 3 series E46, but I had a very similar problem. Mine turned out to be a faulty mass airflow sensor (MAF) that on the 3 series is immediately after the air filter.
I'd gone through a lot of other checks first. Checking there's fuel getting through (after the engine has stalled take the cover off the little nozzle on the fuel rail and press down on the valve - it's like the tyre valve - but keep your head out of the way. If there is enough fuel getting through it will spurt out under high pressure - if not there may be a problem with the pump / fuel filter not getting enough fuel to the engine. All that's assuming the 5 series has a fuel rail like mine etc)
My service was also due so I replaced the spark plugs, air filter etc as they had to be done anyway. Eventually I bought a kit to read the codes from the car's computer and that identified the MAF as the problem.
It was already on the list of things to try but as they are very expensive I didn't want to buy one on the off chance. p.s. buy the proper BMW part. I bought a cheaper 3rd party one and that didn't work leading me to think it wasn't the MAF and calling in the garage for a tow and repair. They put a BMW one on and fixed it.
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