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#1
10-07-2004, 09:09 PM
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99 300E turbo diesel miss
My neighbor just stopped by with this car. Has 177k on it, looks great, but.. runs fine when cold. After just a few minutes to warm up it starts to miss - really rough at idle - shakes the engine pretty good. Continues to miss under light acceleration - clears right up and runs great under hard acceleration. Feels like a gasser with a bad plug wire or something similar.
The "story" was that PO drove the car into about a foot of standing water 6 months ago...car kept running but has had this miss ever since. Sounds to me just like a dirty injector or even air in the fuel system. The dealer - I love this - proposed replacing the entire engine...! I don't hear any unusual mechanical noises although I'm told the "diesel clacking" is a louder than it used to be. Hard for me to judge because my old 300D and SD have never been quiet! Anyone more familiar with these newer cars have any suggestions. Any and all ideas are welcome! Thanks! Fred 
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#2
10-07-2004, 09:31 PM
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Maybe the dealer knows something.. the engine ingested water through the air intake and bent a valve or a rod and did internal damage. Are there any messages in the display or is the orange triangle in the center of the speedometer lit? Tell him I'll buy it off him as-is.
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#3
10-07-2004, 09:39 PM
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Yepper, I did notice the stupid check engine light was on. I'd thought about a bent valve - maybe only hangs up when it's hot? Sucker sure smooths out at high RPM...wow, that thing really goes!
I know water wouldn't compress, but how would that bend a valve? I could see maybe a broken piston or rod from a compression stroke that wouldn't compress... I know just enough to be dangerous, of course!
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#4
10-07-2004, 09:55 PM
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Maybe a mass airflow sensor? The intake is pretty high on those cars if the engine didn't stop running I don't think any internal damage would have been done. Did the dealer pull any codes? It sounds like a bad sensor somewhere. Btw these cars a extremly quiet for diesels, and run very smooth. Probably the most gas like diesel made before the CDI.
__________________
1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#5
10-08-2004, 01:09 PM
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I'll let you know what they find. Don't know if the dealer read any codes and I've only got the setup to read VW codes. I know I'm used to the "acceleration" of my 123 and 126, but I was absolutely amazed at how this 300 E accelerated. That thing really gets up and runs. Wow!
Fred
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#6
10-08-2004, 04:15 PM
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Hi
MAS is easy to check using a voltmeter check out this link, I am 230K http://mbclub.co.uk/forums/showthread.php?t=9279 Cheers
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#7
10-08-2004, 05:30 PM
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Sounds like a problem I had a while back...
Engine idles fine with throttle closed...about 650 rpm. Slowly increase the idle to about 1500 to 2,000 and hold it there and in a few seconds it roughens up starts missing on a cyl. and blows some white-blue smoke. No check engine light or other warning. I noticed it would only do this while the engine was cold to warm. Once the engine was fully hot, the problem went away. My MB dealer found one bad glow plug, and replaced them all at about 49,000 mi under warranty. No problem since. I've also had the mass airflow sensor replaced at about 55,000 miles, and had the check engine light illuminate for that. There were NO other noticeable clues to that one except for the check engine light, though. J.G.
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#8
10-08-2004, 07:35 PM
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Here is an idea, pull out the air filter. If it got wet it should look like it maybe it is blocked? How could a valve be bent if the engine never shut off? If it sucked in enough water to shut it down then yes maybe a valve could be bent.
They are fast for diesel arn't they. 
__________________
1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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