Originally Posted by
EdNL
Hi, I hope someone has a good tip for me:
My 1990 European 525i 24V with M50 engine hasn't driven any kilometers since newyears day.
This is what happens:
The car starts just fine. It revs up to about 1000RPM and then almost immediately it dies. If I try to keep it running by depressing the pedal quite much, it stutters and runs very violently, even backfiring a lot in the intake.
This is what I've done in an attempt to diagnose the problem:
- Carsoft 3.4 diagnostics: No faults in the log of the DME
- Replaced fuel pump, meassured fuel output (0.8 liter/30 seconds) at injection rail --> OK (Bentley)
- Replaced starter motor (check thread about starter motor with white smoke)
- Checked the ignition coils resistance (Bentley Manual)
- Replaced the spark plugs
- Checked the air filter --> was clean
Any ideas?
I really wonder why it backfires so violently in the intake? That would mean a severely bad timing. The strange thing is that it starts just fine, just before it dies.
The problem started a few days before newyears day. I wanted to start the engine. It would rev up to 1000-1500 rpm and then it would die. Second try, it would die again. Third try I depressed the gas pedal and then it would run. After that I comfortably drove 100 kilometers at 60-90mph. Old years eve I drove the car from the road to the place next to our house and since then it's been there, sadly...
No ideas for you, but what a great post! The information is all there and organized and easy to read. This should be saved as an example of how to do it.
Dinan chip, Bilstein sports w H&R, RD sways, RD strut brace, 750 bushings, Zimmermans/MetalMasters, O.E. M Pars, Eisenmann muffler