<e30> Rough idle after tune-up at mechanic

["SXPRASAD.US.ORACLE.COM" <SXPRASAD@xxxxxxxxxxxxx>]

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in reply to Ka Kau Chan <kkc@domain.elided>: 
 
Hi, 
 
After bringing my 1989 325i to the shop for a tune-up, my car's idle is now 
rough.  Looking under the hood, the engine vibrates more than it used 
to. It used to be pretty smooth at idle. 
 
What I brought the car in for: 
	- Valve adjustment 
	- Sparks, air, oil 
What had to be done in addition: 
	- Guibo replacement (cracks) 
	- Rear transmission seal and transmission mounts 
	- One engine mount, was all broken 
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I had a similar problem w/ my '90 325i after a tune-up.  I never fully 
investigated it but I seem to remember hearing that the engine would idle 
rough if the valves were set to spec. 
 
I had another problem w/ rough idle after the oxygen sensor was replaced. 
In 
this case, the idle was really bad, oscillating from about 600-1200rpm when 
the engine was warm.  The problem went away on its own though.  I wonder if 
the oxygen sensor simply needed to get seated properly or something like
that. 
 
I have never found the idle to be really smooth, but the engine is so 
wonderful under power that the idle is something I can live w/.  Unless of 
course it can be improved. 
 
I would be interested to hear what those who actually know what they are 
talking about on this subject have to say. 
 
Sanjay Prasad 
'90 325i 
 

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