Re: rough running91' 325ix

[Cookies@xxxxxxx]

In a message dated 2/5/99 2:05:43 PM Pacific Standard Time, owner-bmw-
digest@domain.elided writes:

<< I've been experiencing a rough idle on my '91 325iX (ever since an
 Inspection II - go figure). Not the "roaming idle" some have described:
 RPM's seem pretty constant, but engine sound and vibration are uneven,
 pretty rough at times. Same thing with both cold and warm engine. Seems to
 drive just fine under load, for what that's worth.
 
 My first guess was the oxygen sensor, which is probably the original one
 with 104k on it, but dealer advised that if there was a problem with it the
 dash diagnostics would have indicated. I recently installed a JimC chip,
 which neither helped nor hurt the problem.
 
 Any suggestions? >>

Run a 20 oz. bottle of Chevron TECHRON through it (one bottle to complete tank
of gas, dont' add gas during runout).

Also, check the motor mounts. They can start to collapse and give the
impression of a rough running engine. However I dont' know how manymiles you
have. My Mercedes gave the same symptom, I thought it was the engine,but it
was just the mounts.

Randy
cookies@domain.elided
BWM CCA member

------------------------------