[W126 Coupe] Intermittant Rough Idle -Me too - HELP!

[Richard Hogarth]

HELP!
When you figure it out, please let me know.
This has been a persistent problem 
on my vdhicle and several others that I know of.  
I've tried nearly everything and I'm certain that I'm vacuume leak free. 
On my car it occurs once the engine comes up to about 65-80 degress on the
temp guage. 
On my vehicle it is totally temp related. 
I've done the inject seals, replaced the temp sensor, ignition module, coil,
plugs, wires, 
swapped injectors, pulled the metal fuel feeder lines and cleaned them out
with a small wire and
carb cleaner as was previously suggested, changed the O2 sensor, replaced
the exhaust manifold gasgets, 
Checked for catylitic converter back pressure, replaced the fuel filter,
adjusted the mixture a million times, 
replaced all of the vacuume hoses, t's, one way vacuume valves, checked the
IAC valve, brought it to a local
MB "specialist", (no dealer nearby), he is stumped; told me to live with it.

So please HELP!
-Richard Hogarth






-----Original Message-----
From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Dwan
Sent: Thursday, October 27, 2005 2:35 PM
To: Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] Intermittant Rough Idle

Possible vac leak at check valve,also idle control unit black rectangular
unit on the fire wall on 126's

-----Original Message-----
From: Robert Cavazos <jazzman_390 at yahoo.com>
Sent: Oct 27, 2005 2:54 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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