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  #16  
Old 11-22-2006, 12:29 PM
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Did you scan for codes?
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  #17  
Old 11-22-2006, 01:04 PM
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True, but there are multiple harnesses.
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  #18  
Old 11-23-2006, 01:01 PM
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The enginer harness was replaced and the other harnesses were checked and found to be fine. There are no codes being stored.
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  #19  
Old 11-23-2006, 01:43 PM
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Are your spark plugs gapped correctly?
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2001 E430, Bourdeaux Red, Oyster interior.
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1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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  #20  
Old 11-23-2006, 07:32 PM
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Yep... checked that too.
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  #21  
Old 11-23-2006, 07:39 PM
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I see you replaced your motor mounts, but have you had them inspected again for the sake of it?

I think MB motor mounts are liquid-filled (could be wrong), and I've heard stories of new motor mounts being ruined during installation, allowing the liquid to run out.
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2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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  #22  
Old 11-23-2006, 08:42 PM
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They have been checked and found to be good. The rough idle is more like occasionally missing than anything else.
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  #23  
Old 11-24-2006, 01:18 PM
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Read my post...

1994 MB E420 issues idle/surging/stalling LONG
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  #24  
Old 11-24-2006, 01:48 PM
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You can actually remove gasket sealing material with a pressure washer... Don't ask me why I would know something like this. The point is, I would look for some sort of vacume leak at and around the intake manifold. You may have a very slight leak causing one cylinder to run proportionally lean at idle. this is something that would be more pronounced on a warm/hot engine than a cold one. You can spray wd40 at the manifold mating surfaces while the engine is running. Any change in engine speed when spraying would be suspect.
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  #25  
Old 11-24-2006, 03:33 PM
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Quote:
Originally Posted by SootyPast View Post
You can actually remove gasket sealing material with a pressure washer... Don't ask me why I would know something like this. The point is, I would look for some sort of vacume leak at and around the intake manifold. You may have a very slight leak causing one cylinder to run proportionally lean at idle. this is something that would be more pronounced on a warm/hot engine than a cold one. You can spray wd40 at the manifold mating surfaces while the engine is running. Any change in engine speed when spraying would be suspect.
This might be something to look at.

On my former car, a 1993 E320 with an M104 engine, the engine developed a massive vacum leak, causing the engine to surge violently. Since a vacum leak is false air in the system, the mass air meters were completely unable to do their job.

After searching for the cause of the vacum leak, it was found to be the intake manifold seal.

I think my mechanic sprayed soapy water at the intake manifold gasket.
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2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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  #26  
Old 11-24-2006, 04:07 PM
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Interesting thought, I'll check it out. This problem occurs when the engine is cold and hot. It's much worse when the outdoor temp is cold or it's humid. So it would seem to be intake air related.
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  #27  
Old 11-24-2006, 04:20 PM
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Quote:
Originally Posted by GeorgeH View Post
Interesting thought, I'll check it out. This problem occurs when the engine is cold and hot. It's much worse when the outdoor temp is cold or it's humid. So it would seem to be intake air related.
That's interesting.

My problem only occurred when the car warmed up.

At cold start, it would idle fine, and then if left idling, after 3-5 minutes, the surging would start. It was a constant up and down surging, from about 500 to about 1,500 rpms.
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2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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  #28  
Old 11-24-2006, 04:32 PM
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The idle speed seems to vary very little, but I feel a miss. (It's a tad under 500 rpm.) It does not seem to do it immediately upon going to idle, but after 10 secs or so. When it's cold or damp and I'm sitting at a traffic light, it seems to miss bad enough occasionally that I think the car will stall... but it never does. Once out of idle everything is great.
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  #29  
Old 11-24-2006, 05:07 PM
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Have you checked and see whether or not the engine control modules were updated or reprogrammed over time?

I remember reading that on the E420's, the chips were reprogrammed to slightly increase the engine idle. The E420 is also an M119 engine, and virtually identical to yours.

JimF has an '95 S500, and his website with a lot of this stuff detailed.

His site is well organized and makes for a good read.

http://pages.prodigy.net/jforgione/MB_S500.html
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2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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  #30  
Old 11-24-2006, 05:20 PM
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Check out this thread:

PAD Chip in S500


Contact JimF and see if he will reprogram the chip in your LH module.

It apparently changes your engines idle quality.
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2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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