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You are in the Mercedes-Benz E-Class
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Mercedes-Benz E-Class, Sedan
#6382 of 6720 Problem with 2001 E320. Anyone experienced this?
Feb 01, 2006 (2:35 pm)
Noticed a problem with my 01 E320 over the past month. It only happens under heavy acceleration. When you punch the throttle to speed up rapidly as if to pass, the car really bogs down and struggles to gain speed. The tach revs up but the car just doesn't go. This also happens from a standstill if the car is "punched" to accelerate. Doesn't happen if you ease into the throttle as the car will moderately gain speed if you only half throttle. Car runs fine as long as you don't have to really get on the gas. I took it to a local guy who sells & services Mercedes but they are not a dealer. Said it sounded like a mass air intake problem and he actually swapped a couple of these off some of the E320's on his lot and tried them in my car, but the problem still persisted. Then said it could be the O2 sensor but thought it was bad gas. Said to use a couple tanks of Shell's 93 octane to see if it clears up... But, I'm not buying the bad gas idea... Can understand maybe one tank of bad gas, but not bad gas for a couple months??? Anybody w/ E320's had a similar problem? If so, what was the culprit? Any help would be appreciated. Thanks.
#6383 of 6720 re post #6382
Feb 02, 2006 (12:23 pm)
have you checked the exhaust system?
#6384 of 6720 Re: re post #6382 [acco20]
Feb 03, 2006 (5:05 pm)
No... Haven't checked the exhaust but I really wouldn't know what to check for. It has not thrown a code yet and it didn't show any stored codes or fault codes when the diagnostic was performed on it by an independent dealer that has the exact same computer as the MB dealerships. But something is obviously wrong. How would you check the exhaust? I was thinking it could be plugs/plug wires or maybe the O2 sensor... But it seems like if there was a problem with any of this, it would throw a code stating there is a problem.
#6385 of 6720 Re: Designo, Airmatic [edspider1]
Feb 03, 2006 (5:41 pm)
Sorry, no one seems to know much about Deisgno (except as I recall it is a 6K or so option). I wonder how many MB come through with it? It kind of reminds me of the "soft leather" option on some Porsches. For $800 over the usual leather they would provide "soft" leather that looked like a couple had spent prom night frolicing in your front seats. No thanks.
#6386 of 6720 re: post 6382
Feb 04, 2006 (7:06 am)
If any clogging exists in the exhaust system, it is possible the reaction would be somewhat as you are discribing......... Not noticable at slower speeds, but hesitation and lack of power at higher speeds or under heavy exceleration. Just a thought,,,hope it helps.
#6387 of 6720 Re: Problem with 2001 E320. Anyone experienced this? [neilclarke]
Feb 04, 2006 (9:49 am)
I drive an '01 E-320 and do not experience that problem. If this dealer can't fix it, try another.
#6388 of 6720 In terms of the exhaust
Feb 05, 2006 (6:19 pm)
system, what you are checking for is this...I have seen this on American cars, it is rare but does happen...
In some cars, maybe your Benz, the exhaust pipes may be multi-layers of steel, which may have quieting insulation between the layers...imagine that the inner layer collapses and now a 2 inch exhaust pipe now has a 0.5-1 inch opening, which will not allow the engine to breathe...
At low speed, no problem, does not need to breathe too much...but when you floor it, suddenly the engine is choking on too much back pressure...
If correct (a big if) then listening at idle or high revs will show nothing, as there is no load to choke the engine...in the past, it was only revealed when the exhaust system was removed, the pipe was revealed, and you could see the collapsed layer...drove technicians nuts, because if the systems were welded, pipes to muffler, there would be no reason to cut a pipe in half to look at it if it was welded to the muffler, just discard the entire assembly...
Only when the pipe was not welded to the muffler, could you look in the pipe and see the underlying problem...
Maybe computers are better now, but when this was discovered, the diagnostic computer had no idea what was wrong...
#6389 of 6720 1992 MB Stalls at Operating Temperature
Feb 06, 2006 (8:29 am)
My 1992 MB 300E 2.6 is 100,000 miles young. The engine starts with no problem. When the engine reaches optimal temperature (80 C) it misfires and stalls. It will not restart until the engines temperature significantly decreases. My MB dealer in Florida has replaced the speed controller and idle valve with no resolve of the situation. Do you have an answer to the problem?
#6390 of 6720 Re: 1992 MB Stalls at Operating Temperature [ram83a]
Feb 06, 2006 (8:56 am)
The first thing that comes to my mind is, "Vacuum leak". As the engine is running rich while warming up, the extra richness could mask a nominal intake system leak, however, once the engine is warmed up and the mixture leaned accordingly, you may find that there just isn't enough fuel to keep your engine running.
#6391 of 6720 Re: 1992 MB Stalls at Operating Temperature [shipo]
Feb 06, 2006 (2:11 pm)
Thank you for the reply. The car is now in Vermont and I do not dare to take it out of the garage because of the continued problem and the fact that I can not find a Mercedes Benz mechanic in the area. Can you provide me with a starting point or tool(s) that I should purchase to assess the vacuum system for a possible leak?