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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 07-20-2004, 06:47 PM   #1 (permalink)
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Well now when i rev up my car and im under the hood i can hear a grinding noise
right by the vanos unit.. you dont hear it at idle but when you rev it up it sounds like
a gear isnt grabing. can the vanos unit break , i know i cant fix it. i think im screwed ghead
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Old 07-20-2004, 06:51 PM   #2 (permalink)
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what rpms is is inbetween? mine scratches/grinds a bit between 1000-2000rpms... I'm having my car looked at soon for it..
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Old 07-20-2004, 07:21 PM   #3 (permalink)
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yeah the higher you rev it the more it grinds. i can only imagine what this will cost to fix. also does anyone else hear like a tick noise underneath the car when at idle?
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Old 07-20-2004, 07:54 PM   #4 (permalink)
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Yeah the tick is normal, it's just noise from the valvetrain, can't help you with the vanos though. It almost sounds like the teeth on the gear for the vanos got stripped...
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Old 07-20-2004, 08:15 PM   #5 (permalink)
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should i not be driving my car then? it seems to run fine. also is the vanos expensive?
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Old 07-20-2004, 08:36 PM   #6 (permalink)
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If your really concerned, I would seek professional help from a dealer or authorized BMW mechanic.
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Old 07-20-2004, 08:59 PM   #7 (permalink)
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how old is the car?
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Old 07-20-2004, 09:20 PM   #8 (permalink)
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its a 94 with 118k mi on it
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Old 07-20-2004, 10:54 PM   #9 (permalink)
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Yes, as robbins6103 said, I would probably go to a dealership or authurized BMW mechanic for this one as well if you can't find the exact problem.

Are you sure it's not your AC compressor clutch slipping? my A/C clutch squeels like no tomorrow. Turn the AC off and see if it's the same.
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Old 07-21-2004, 04:08 AM   #10 (permalink)
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hey I also agree with the above information, but more so the last by bitcore as my airconditioning was squling like a little bitch when the magnetic switch failed in it! only cost me about 100 bucks to fix it, and if I turned it off it stopped the noise so I would recommend taking it to a proper mechanic, but if you got a couple of days before you go; try eliminating as many differant things as you can, its possible that it could be a bearing on the belt which is on the way out, the really easy way of eliminating that problem is to get someone to start the car whle you hold a screwdriver "a long long one" on the center of each bearing then put your ear on the end of the screwdiver, it will act as a "stepascope" "spelling" and you will very quckly find out wheather or not the bearing is on the way out! A bmw technicain showd me this and it does work!, however in saying that if your not mechanicly minded, just take it to some one that is!!! I would hate to see someone loose there fingeres in that fan

hope you solve this prob and kep us posted on what it is!!
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Old 07-21-2004, 06:24 AM   #11 (permalink)
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Get the garage to check that every thing is nice and tight. I know they develop problems between 60 and 70k miles so it might be time for some new belts.
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Old 07-21-2004, 08:19 AM   #12 (permalink)
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Preformance lightweight pully upgrade as welll? :lol:
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