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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 09-20-2010, 09:47 AM   #1 (permalink)
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High idle, noise while turning

Hi, I'm new around here, so forgive me if these questions have been addressed previously.

'85 325E: idles around 1200 -1300 RPM, all the time. Can't find any info in owner's manual or Haynes book as to what the idle rpm should be, or possible causes.
Any ideas?

Next question: On tighter turns, I'm getting a rumble/grind from the rear. I'm hoping it is just low oil level in the differential, but considering the cars age...

Finally, where can I get the service code reset tool relatively cheaply?
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Old 09-20-2010, 09:58 AM   #2 (permalink)
OMFG another one!?
 
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About the noise from the back, that's almost certainly a need of new gear oil in the differential.
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Old 09-20-2010, 11:37 AM   #3 (permalink)
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Originally Posted by witeshark View Post
About the noise from the back, that's almost certainly a need of new gear oil in the differential.
That's kind of what I was hoping... I'd hate to have to try and find a 25 year old differential!
I did notice on the emissions tag under the hood that "ignition timing and idle speed: No Adjustment Required"

Last edited by conjuay; 09-20-2010 at 11:39 AM.
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Old 09-22-2010, 05:48 AM   #4 (permalink)
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Well, the diff oil wasn't it. There was some foam in the old oil, and the noise seemed to stop for a day. Then last night a right turn in a parking lot brought it all back, a deep rumbling noise from the rear of the vehicle.
Any ideas on how to proceed? There are some rubber couplings that look almost like the old front axle 'donuts' that were on the Saab 96's from the sixties, but I don't see any physical damage on those... Then, near the wheels, there are CV joints, but CV's usually chatter when they go bad, not a groaning sound... and CV's usually show boot damage,which I don't see.
I'm hoping some of you seasoned people will jump in with ideas on how to proceed...
TIA
Mike
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