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Old 04-13-2004, 12:29 PM
Registered User
Join Date: Jul 2003
Location: Northbrook,Ill
Posts: 3
Rough Idle in gear

I have a 1988 300TE with 48,000 miles on it. I have replaced the plugs, plug wires and injectors and still have a rough idle when the car is warmed up and in gear. Anyone have a solution?

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Old 04-13-2004, 01:14 PM
Posts: n/a
I was about to suggest checking the motor mounts but you have pretty low mileage. I thought that 65K on my '91 was low!
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Old 04-13-2004, 03:08 PM
I told you so!
Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,844
Two thing I can suggest:

- Clean the throttle body bore.

- Check the egr valve to make sure the poppet is perfectly seated and no exhaust gases are getting by at idle.
95 E320 Cabriolet, 153K
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Old 04-13-2004, 03:44 PM
Senior Member
Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
Motor mounts,Motor mounts,Motor mounts must be the mounts
MB STARS Master Guild Technician,17 years MB tech
14 years independent shop owner
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Old 04-13-2004, 04:15 PM
terminator's Avatar
Registered User
Join Date: Feb 2003
Location: NC
Posts: 119
I had moisture in my fuel tank on my 89 300SEL. I used STP gas dry and it cleaned up my problem within a half of a tank. I tried various fixes for my idle, but nothing seemed to help. So I put everything back to factory spec and ran the STP and that fixed my problem.


90 300D 511k
95 C280 133k
14 BMW 528i
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