Thread: E34 M5 rescue
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      01-01-2023, 03:53 PM   #6
grannyknot
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Drives: 2008 Z4M coupe
Join Date: Oct 2021
Location: toronto

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Congrats, not many of those left, 1991 so that could be the S38B36 3.6L engine, 311hp or possibly the S38B38, 3.8L 335hp.

I've owned an e24 M6 with an earlier version of the S38 and a e34 535 and I wish I had never sold the e34, one of the best highway cars I ever drove.
Both of those cars were known for some electrical gremlins so it would be worth spending some time cleaning all of the electrical body grounds down to bare metal.

The 6 independent throttle bodies are the same across all of the S38 engines and I can almost guaranty you the 15 needle bearings supporting the throttle shafts and linkage shaft are by now seized with hardened grease and dirt.

Your car is still fairly low mileage so hopefully the hard chrome covering the soft brass shafts won't have worn through yet but if it has you'll want to free up those bearings soon before the wear gets bad.
The only real way to do that is to remove them from the intake manifold and disassemble them.
I know that sounds like a daunting task but really it's pretty straight forward, here is a link to my DIY on the S54 ITBs but the procedure is pretty much identical.
https://www.zpost.com/forums/showthread.php?t=1962915

The first set I rebuilt were from the S38 in the M6 and at 176,000mi the shafts were badly worn and had started to allow vacuum leaks.

Looking forward to pics of your restore.
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Last edited by grannyknot; 01-06-2023 at 02:43 PM..
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