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#1
12-23-2007, 09:35 PM
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Debugging serious engine miss - W124 400E
My 400E starts and runs perfectly - for 2 minutes, 53 seconds. Then it starts to miss horribly - sometimes even goes into guardian mode. The timing is repeatable. The engine is not yet up to temp, but the transition is sudden and unmistakable - it's as if someone threw a misfire switch. Does anyone know the ECM program well enough to tell me what might be happening at three minutes into run time? Is there a certain sensor being checked, or a specific algorithm starting up?
I've already changed the spark plugs and the fuel injector wiring harness. 
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#3
12-24-2007, 08:36 AM
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Hmmm. Not yet. Is a visual inspection good enough to confirm it as a possible cause, or should I just order new parts and install them?
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#4
12-24-2007, 09:38 AM
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those dist caps and rotors suffer from the infamous green crud,need to be replaced, common problem.
__________________
David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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#5
12-24-2007, 10:04 AM
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OK - I ordered 'em. Thanks for the tip. I'll post results here.
Anything else "while I'm in there?"
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#6
12-29-2007, 04:36 PM
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New caps and rotors fixed it. Between the upper harness, plugs, caps, rotors - I should be in good shape for a while, eh?
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#7
12-29-2007, 08:22 PM
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I've been trying to route down my misfire for quite some time. Glad to hear you got yours fixed!
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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