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#1
10-04-2010, 01:03 PM
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Went right for the EHA...and noticed it was wet. I checked O-rings and they looked OK. I removed it, cleaned all the surfaces and retightened the bolts (need new bolts too...these are getting stripped)-- But upon reinstallation I noticed this!
It seems to be weeping out a hole in the rear  Is this a 'weep' hole? Either way, looks like I need to replace it. It was quite handsomely dripping out when the car is running. Guess this could be it? Although maybe I don't understand how that would cause an overfueling situation? I would have thought it would make the car run very lean? 
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k Last edited by ps2cho; 10-04-2010 at 01:36 PM. 
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#2
10-04-2010, 03:30 PM
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When EHAs go bad, it seems that they can cause all sorts of issues including lean and rich conditions...
I think if you replace this EHA with a good used unit or a new one, you will have solved the problem... but we shall see.
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2006 BMW M5 "Heidi" @ 109,000 miles 2005 MBZ C55 AMG "Lorelai" @ 165,000 miles 1991 MBZ 300E "Benzachino II" @ 165,000 miles 1990 MBZ 500SL "Shoshanna" @ 118,000 miles (On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)
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#3
10-04-2010, 03:32 PM
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Well, if the EHA is failing to properly adjust upper/lower chamber pressures, then I suppose it could wind up being either rich or lean, depending on which "direction" it was failing.
I would still check the temp sensor by measuring its DC resistance, and comparing it to the temperature/resistance chart. The symptom you have seen with a bad temp sensor is what happens when it fails completely. If its value has drifted, that might give different results. It's also possible that something got disconnected when the work was done. Also, on an M103, there is always the possibility of vacuum leaks even in spots you have already fixed.
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-tp 1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS 1988 560SEL "Gunther"- 190K passes anything except a gas station 1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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