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E12, E28, E34, E39, E60General discussion and technical help for all year 5 series cars.
It's a creaking noise at idle, but goes away as soon as I hit the gas and raise the rpm's. Sounds like crickets in a field. Seems to be coming from the idler or tensioner pulleys, but I can't be sure. I removed the pulleys and they're pretty worn, but I can't reproduce the sound by freespinning them. I really hope it's not something worse. I'm gonna replace both pulleys tomorrow and see if it goes away, but if anyone has any ideas, lemme hear them
Well this is a strange one . . did some massive research, and I turned up an issue when the crankcase vent valve gets gunked up, it can't relieve the pressure in the valvetrain. There are a few different noises it can make, so on this hunch, I dumped Seafoam into the crankcase vent hose at the valve cover. The sound is so faint, if it's even there at all now. Maybe another Seafoam application I think. Hopefully this did the trick; I'd hate to have to replace the CVV-- on the M54, it's tucked away in a gawd awful unreachable spot under the intake manifold . . . one month with this car and I've got my hands under the damn hood already
Numark, you're not gonna like this post . . The noise has returned although it's not as loud as before. Using a mechanic's stethoscope, I came upon a bad diagnosis. It's coming form the oil pump. Either the pump is going bad, or hopefully it just needs a new chain or the chain tension needs some adjustment. Either way, it's gonna be a PITA to get to that location. Anyhow, I don't think it's a big rush to get the job done. Or better yet, I may just take it to an indy shop to get it taken care of . . I really don't wanna be messing around with this car like I did with the other one.
A couple of months down the road, and I thought I'd bring some resolution to this thread. Man was I waaaay off! Thanks to Numark318i, who told me that it was the water pump on his M54 that was making the noise. Sure enough, after I replaced mine, the noise is now gone. I should have done more research tho . . Turns out it's the same identical water pump from the E36, and I had a spare one around from my old 325. But I didn't find this out till after I bought a new one At least the job only took me less than an hour.