Question about BMW 325
Initially I would least likely suspect any fuel related problem. It would appear your problem is electrical and based on your description, intermittent and possibly heat related.
Rough idle, stalling could be ignition related such as the ignition coil, distributor/cap, rotor. Possibly a cracked in any of the insulated casing/housing of these electrical components allowing spark to arc/escape causing misfire in the plugs. Try running the engine in a dark place, hood open and check for spark jumps.
It is significant that the engine will not crank. This is indicative of no power to the starter motor. Please see this response for starter related concerns on another make/model.
Spark plugs - too much fuel (wet) could be because it is getting correct fuel but it is not firing thus subsequent fuel injection would simply wet it (no detonation);
A remote possibility is leak in the intake manifold, any of the vacuum lines and/or the air cleaner assembly. You could try spraying "ether starting fluid" on the suspected leak areas during the rough idle and see it the idle smoothen out, if yes - leak confirmed.
Alternately, though still remotely, is undercharging. The battery might be getting just enough to run shortly but not to re-start later on. Low B+12 would also cause erratic ignition performance and poor fuel pump motor pressure.
Of course, the best diagnosis and technically correct is to have the car's computer scanned for log errors and interpreted for "probable" faults.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
Posted on Jul 21, 2008
How about the temperature did you check the meter. if rising then get the vehicle checked for heating
Posted on Jul 21, 2008
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Posted on Jan 02, 2017
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