Bimmerfest - BMW Forums - View Single Post - Mechanical things you need to know about your E34 - UPDATED 3/22/11
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Old 05-17-2011, 01:52 PM
BMR_LVR's Avatar
BMR_LVR BMR_LVR is online now
Humble E34 lover
Location: Asheboro, NC
Join Date: Dec 2008
Posts: 5,464
Mein Auto: 1992 525i
While a bad coolant temp sensor can cause a no-start, it is not a common issue. It would not cause the engine to fail to turn over.

Regarding the fuse, you don't specify which one. Some that fail can definitely cause the engine to not start.

Diagnosing no-start situations can be difficult and lengthy. The best approach is to think about which system is likely the problem and rule them out or in.

Usually check fuel supply first. It could be out of gas, have a clogged fuel filter, failed fuel pump relay, failed fuel pump, failed fuel pressure regulator (not common).

It could be an electrical problem such as a bad battery, bad alternator, failed DME relay, failed crankshaft position sensor (very common), failed coil(s), bad spark plugs, failed DME and the list goes on.

I don't mean to sound trite, but the best thing to do is get either a hard copy of the Bentley manual or the downloadable version in PDF format. Start reading about how to troubleshoot to find your system that has failed and then narrow it down. If you don't have a lot of mechanical skills, then I suggest you take it to a reputable independent BMW mechanic.

Keep an eye on your original thread and I'm sure others will chime in as well.

Good luck and we will do all we can to assist you.


EDIT: I did not see a thread on the E34 forum and had to search for the thread and found it on the member welcome page. Please re-post the E34 portion in the E34 section.
Most problems are usually something simple !

Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.

Calypso Red 1992 525i with 225K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

Last edited by BMR_LVR; 05-17-2011 at 01:56 PM.
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