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E36General discussion and technical help for (E36) 1992-1999 3 series cars. 318, 323, 325, 328.
Location: SW corner of CO, live in country near village called Mancos
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Your Ride: 1992 325i & 2004 325xi
The early m50 engine, at least on the pre-vanos version, is noted for noisy lifters. In fact in some instances (reference: Roundel magazine tech editor) BMW had to replace lifters. My '92 has noisy lifters, and I thought to replace them until I found out what a bitch it is. There is a special jig required to keep constant pressure on cams. See Pelican parts for more info on lifters. On the other hand, if what you hear is not lifters but detonation (pinging), then you might take a look a the ping sensor that is supposed to alter ingnition timing to eliminate ping. Uncorrected, detonation can be harmful to engine. If sensor is the problem, it should be inexpensive and easy to remedy.