Question about 2003 BMW 325

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I have a 2003 BMW 325CI, when i go to start it, it runs for like 5 seconds and then shuts off? would this be somthing to do with the fuel delivery? Runs smooth but just cuts out.

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First thing to check is the fuel pressure, there is a scrader valve under the black fuel rail cover to the right of the valve cover, just pop off the small circle and take off the 10mm screw. Hook up a a fuel pressure guage, then turn the key to the start postion and check the guage. there should be about 3.5 bar of pressure (50psi). If it doesnt build up it could be the fuel pump of a clogged fuel filter. If all this is good, then it may be a bad mass air flow sensor.

Posted on Mar 04, 2009

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Sounds like anti-theft system

Posted on Mar 01, 2009

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My 2003 bmw 325ci instrument cluster stopped working one day, but car started and drove. Got back in the car, and it wouldn't start! Cranks, but no VROOM! Confirmed fuel flow, but no spark. How are...


Sounds to me like you have a wiring harness loose somewhere, or you have a short. Check to verify you have power at the fuse panel to the fuel pump and the instrument cluster (and, of coarse that all your fuses are good). It's also possible both problems are completely unrelated. Let us know what you find.

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When you say that it tries to start but does not turn over - I interpret that to mean that the starter is cranking the engine, but the engine fails to start. Is that correct?
The ignition on these cars occasionally looses a single coil, but is not prone to loosing all ignition on all cylinders at once, so probability indicates that the problem is lack of fuel delivery.
This car is prone to two fuel delivery problems: 1) Failure of the fuel transfer pump that moves fuel from the driver side tank to the passenger side tank where the fuel delivery pump is located. If the car runs out of fuel when the gas gauge registers 1/4 full, and runs again if you add more fuel, this is the problem. 2) Failure of the fuel delivery pump. This is less common, but my wife's '04 330 lost a fuel pump at 80k miles, so it can happen.

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100 k IS REALISTIC MILAGE IF YOU DON'T DRIVE HIGH MILAGE, I WOULD HAVE TO GET REAL DEAL TO BUY WITH 100K, CONTEMPLATE
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Replace fuel filter and check fuel pump operation. Sounds like fuel starvation.

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It could be so many things wrong with this car has the electronics are very complicated something has silly has a fuse may have blown fuel pump may have packed up the list just goes on. So you would be best taking your car in to a garage and asking them to diagnose your problem this could save you a lot of money rather than just replacing parts that dont need replacing.

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You really cannot mis it. It is at the front of the engine, top center. Black can-shaped housing. Unscrew the top of the housing and replace the paper element inside.

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