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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sun, Nov-04-2018, 03:31:09 AM   #1
jrockbk01
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Default Please help diagnose my electrical issue

Hello all, I have a problem with either my alternator, battery, or wiring harness.
The problem started today immediately after I swapped valve covers. A little background for context. I drive a 97 318ti with swapped s50b30 thatís modified and running OBD2. I originally ran the S50 obd1 valve cover for a while but could not get it to not leak oil. So I changed to OBD2 plastic cover and this when my problems began. As you may know obd1 coil packs are different in shape and bolt pattern than obd2 coil packs. Iíve been using BavAuto coil packs for 3 years now without any issues, but I couldnít reuse them on the new vc because they wonít bolt down properly. So my buddy gave me a working set of obd2 coilpacks. So, after everything was installed i immediately notice my headlights stopped working, my music amplifier would only turn on during idle and whenever the engine reved the sound would cut out. Also my battery which is located in the hatch inside my car started to get hot and vent a bunch of fumes( that smell horrible btw and was making me feel ill). I tried disconnecting the battery with the car running to see if I could drive home on the alternator alone but as soon as I gave it gas the car died. There is also a smell like a burnt electric motor smell coming from under the hood. Things I tried to do to solve the problem include, making sure both grounds on the valve cover had good contact with the coils and the vc bolt. Iíve also put the bavauto coils back in for good measure to see if that solves the issue but it didnít. I had to tow the car home any ideas Iím leaning towards it being a bad alternator bc it was extremely hot when I touched it. But can a bad coil ruin a good working alternator? What else could I try?


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Last edited by jrockbk01; Sun, Nov-04-2018 at 03:41:09 AM.
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Old Sun, Nov-04-2018, 12:49:48 PM   #2
NolliM3
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Default Re: Please help diagnose my electrical issue

My first thought is your wire harness hack...what I would do, if in your situation, it to go back to the OE valve cover...your oil leak is that you lack proper installation...there are spots that require a gasket sealant.

I replaced my gasket and have zero oil leak...noted places for the gasket sealant are the back of the engine by the half moon as well as the front where the vanos cover meets the engine block.

Also, your post is in red ink...very difficult to read.
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Old Sun, Nov-04-2018, 01:41:40 PM   #3
craigjimc
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Default Re: Please help diagnose my electrical issue

Check the engine-to-chassis ground cable at the lower right front,
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Old Sun, Nov-04-2018, 08:57:31 PM   #4
jrockbk01
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Default Re: Please help diagnose my electrical issue

Checked the alternator voltage it was overcharging, guess the regulator blew swapped it for another alternator and everything is back to normal


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Old Sun, Nov-04-2018, 08:59:00 PM   #5
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Default Re: Please help diagnose my electrical issue

Good work
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Discussing Please help diagnose my electrical issue in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)