[W126 Coupe] Intermittant Rough Idle

[Shayegan, Richard]

Look around for a vacuum leak with a can of carb cleaner. Are you
positive you took all of the old seals out when you put the new
injectors in? A double sealed injector will cause a vacuum leak and mess
with idle. Also, try richening the mixture a touch.
Richard

-----Original Message-----
From: mbcoupes-bounces at mbcoupes.com
[mailto:mbcoupes-bounces at mbcoupes.com] On Behalf Of Robert Cavazos
Sent: Thursday, October 27, 2005 2:55 PM
To: mbcoupes at mbcoupes.com
Subject: [W126 Coupe] Intermittant Rough Idle

I need advice from the diagnostic folks.

My wife's '87 560SL typically has a silky smooth idle,
lately however after the car has been running for
about 30-40 mintes the idle starts getting rough
almost like a one cylinder is missing. It can get
pretty bad shaking the car considerably. When the
engine is revved, it seems the miss goes away but
returns at idle. It does not appear to be related to
engine temperature and ambient air temp is about 80. 

It also dosesn't appear to be realated to driving
conditions as it will occur with driving around town,
and when coming to a stop after freeway driving.

Background
The fuel injectors were replaced a few thousand miles
ago, and I checked the plugs last weekend looking for
anomolies. They all looked fine. I also wiped out the
inside of the dist cap and rotor thinking there might
be moisture inside due to a recent few days of wet
weather. 

Any ideas what else to look at or try?

Bob Cavazos


		
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