1994 525i will not start

[faloon52]

fuel pump turns on. no injector pulse. no spark. cranks fine. any ideas?

I have a 1994 BMW 525i i get no injector pulse no spark fuel pump is working engine turns over but will not start anybody got any suggestions
Thanks Mike

I have a 1994 BMW 525i i get no injector pulse no spark fuel pump is working engine turns over but will not start anybody got any suggestions
Thanks Mike

How do I do That
Thanks Mike

[scooter]

Originally Posted by faloon52

fuel pump turns on. no injector pulse. no spark. cranks fine. any ideas?

a good idea is to post in the proper forum if you want the best chance of getting help.

[Big Evil]

Lift up the rear seat bottom, pull the yellow relay out of the body junction box and try again to start it

[faloon52]

Hi Big Evil
I pulled the yellow relay & still the engine will not start it turns over ok any other suggestions I appreciate your time
Thanks mike

[Big Evil]

While cranking does the check engine light go out? If not, the ECU isn't getting a crank signal and doesn't know when to fire the injector or plugs. That would be a CKP (crank position sensor) or related wiring/connectors. Other option, ECU is dying, but that's a last thing on the list.

[773tonjay]

I am new to the scene. I wish to say a very loud "Hellooooo" to everyone. I ride a 1994 525i. It was like "wow" for a couple of weeks BUT THEN; it started giving signs of over heating. I tried to take it home that night by stopping to let it cool for some time and then going on again. After 2 such stops, I found a towing truck to take us (the car and I) home. Next day, I managed to ride it to a mechanic who could not figure out the problem. He thought it was the ECU. He ordered a matching ECU as replacement; engine behavior got more erratic. Before I take it to a BMW dealer to be slaughtered, I am wondering if someone out there has some useful ideas. Thanks for your time.
773tonjay

[773tonjay]

I am new to the scene. I wish to say a very loud "Hellooooo" to everyone. I ride a 1994 525i. It was like "wow" for a couple of weeks BUT THEN; it started giving signs of over heating. I tried to take it home that night by stopping to let it cool for some time and then going on again. After 2 such stops, I found a towing truck to take us (the car and I) home. Next day, I managed to ride it to a mechanic who could not figure out the problem. He thought it was the ECU. He ordered a matching ECU as replacement; engine behavior got more erratic. Before I take it to a BMW dealer to be slaughtered, I am wondering if someone out there has some useful ideas. Thanks for your time.

773tonjay

[Big Evil]

The ECU does not cause overheating.

Bad thermostat, bad water pump, leaky hoses/radiator, wrong coolant, lack of maintenance/coolant, bad cooling fan or relay or blocked radiator cause overheating.

Overheating causes head warpage and leads to dead engines. Also you CANNOT mill a BMW head and have it work in most cases, they require straightening (much more expensive) That's why you ALWAYS keep an eye on the temp gauge and if it starts to overheat you pull over and turn it the hell off immediately. Properly maintained systems RARELY overheat (and that's true of just about every make and model).

I'd say find an independent that specializes in BMW. The dealer CAN help but is expensive and far more outfitted to stuff less than 10 years old. The old cars are fairly easy to work on and get parts for, just don't take it to someone who thinks a computer will cause an overheat, I wouldn't even take a 1974 Pinto to that guy.

[macky55e34lover]

better check the crank sensor, are the spark plugs good? (for faloon 52)

[macky55e34lover]

for 773 tonjay - consider all of the things given by big evil, they are indeed correct, you might have a worn-out head gasket that is why it overheats, it's actually the first time i heard of an overheat caused by the ECU