M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Electrical => Topic started by: gwarsco on February 05, 2009, 12:43:00 PM

Title: I really need some input here
Post by: gwarsco on February 05, 2009, 12:43:00 PM

Ok, I have a 1991 318i. Finding a manual is nearly impossible for the '91... Fine, I have worked around that thanks to this forum.

I had a short in the wires leading to the #4 coil. When it shorted, it caused a small fire, but also burned out the Computer. Ok... Rewired, replaced the computer, still no spark on any cylinder. More testing, and found that the crankshaft position sensor only read about 100 ohms, and replaced that. Everything else seems to check out fine, but still not getting any power to the coils.

  anyone got any suggestions?

  Greg

Title: I really need some input here
Post by: txleadfoot on February 05, 2009, 01:53:11 PM

check the main & fuel relays on the firewall.

Title: I really need some input here
Post by: gwarsco on February 05, 2009, 02:06:35 PM

Ok... how do I check them?

Title: I really need some input here
Post by: roundel318 on February 05, 2009, 10:15:52 PM

I have a 91 318i, there is a electrical manual on here.

Title: I really need some input here
Post by: JP 91iS on February 06, 2009, 01:04:25 PM

Quote from: roundel318;65997

I have a 91 318i, there is a electrical manual on here.

Links are helpful, but gwarsco you can find the manuals in the M42 Reference section.

As for checking the relays your best bet is to swap them with known good ones.  If you don't have access to good ones there are some tests you can run that are outlined in the Bentley manual (you can find those to download in the reference section too).  The tests are also covered on this forum but that information is slightly disorganized and hard to find.  But you can try searching or downloading the Bentley.