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#16
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Did you scan for codes?
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#17
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True, but there are multiple harnesses.
__________________
1995 S600, 1 of 618 (sold) "Speed is just a question of money...how fast you wanna go?" LONG LIVE THE W140! Visit my Web Page at www.v12uberalles.com |
#18
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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
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Are your spark plugs gapped correctly?
__________________
Paul S. 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". |
#20
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Yep... checked that too.
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#21
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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.
__________________
Paul S. 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". |
#22
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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
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#24
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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.
__________________
64 European Coupe Brilliant Silver with Red interior 4 Speed Sunroof 87 TDT 286k 87 SDL 195k 83 SD 202k 83 SD 201k 83 D 286k 02 R1150RT 32K 00 122HP FLSTF 07 KTM 250SX "Danger takes many forms" |
#25
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Quote:
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.
__________________
Paul S. 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". |
#26
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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
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Quote:
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.
__________________
Paul S. 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". |
#28
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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
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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
__________________
Paul S. 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". |
#30
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Check out this thread:
http://www.peachparts.com/shopforum/showthread.php?t=17198&highlight=chip Contact JimF and see if he will reprogram the chip in your LH module. It apparently changes your engines idle quality.
__________________
Paul S. 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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