1992 Mercedes Benz 300e stalling

Tiny
JERK
  • MEMBER
  • 1992 MERCEDES BENZ 300E
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 88,500 MILES
I start the car, then drive for a few miles, then the engine dies and will turn over but refuses to start. Was told the "overload protection relay" was bad, replaced it twice, still same problem, I know "warning system box" under rear back seat is bad, but bad section (trunk area) is unplugged. Drove the car across the country previously with zero problems, now dies after warming up. Let it alone for an hour and it starts right up as if nothing happened. Could it be the fuel pump relay? I am ready to scrap the car, but it only has 88K miles on it and everything works perfectly, but cannot drive it! Please help?
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Sunday, April 5th, 2009 AT 2:05 PM

6 Replies

Tiny
JAMES W.
  • MEMBER
It could be the FP relay, but more than likely, it's the fuel pump itself breaking down from heat and stalling. Once it cools down it'll go again for a while, then do it again. Hope this helps. A fuel pressure test when the stalled condition exists will confirm this.
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Tuesday, April 7th, 2009 AT 1:18 AM
Tiny
JERK
  • MEMBER
The car has 2 fuel pumps, one in the tank and one outside. It just doesn't seem right to me that a electric pump would run perfect for a time and then quit. Also, I drove the same car 2 weeks ago for 20 miles and it never did quit, then next time I drove it, quit after warming up. I thought electric pumps either worked or did not work, but not sometimes yes sometimes no according to temps? I read on the forums that hundreds of the same cars had the same problem, replaced pumps, relays, CO-2 units, MAP units, overload protection relays and spark plugs, rotors and wires and STILL have not cured the problem. I cannot afford to replace every electronic unit in the vehicle (after only 88K miles) @300 to 500.00 per part just to "try" it. I am looking for someone that can tell me the problem and cure clearcut and concise?
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Tuesday, April 7th, 2009 AT 1:59 PM
Tiny
JAMES W.
  • MEMBER
Well, if "hundreds" of the cars like yours have the same problem, are you telling me that no one has come up with a solution?
I'm going to put you back on the post list and maybe someone else can help you.
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Wednesday, April 8th, 2009 AT 1:57 AM
Tiny
JERK
  • MEMBER
Yes, there are many people with similar cars with the identical problem, nobody has found the problem yet, albeit many have tried. That's why I went to you people. Hello, anybody home? The fix you suggested was tried many times by others with zero results, I am just trying to get to the bottom of this. Mercedes denies this is happening, but we all know it IS! If you cannot tell me what it is, please say so and I will keep searching. It has to be electronic! Most likely so far is the "crankshaft positioning sensor" one person on the forum said he replaced his and the problem (stalling out after warming) has dissapeared. No matter which forum you go to, for Mercedes, there are people with this problem from 1980 to 1995.
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Wednesday, April 8th, 2009 AT 11:37 AM
Tiny
JAMES W.
  • MEMBER
I'm going to put you back on the poster board 'cause "I" don't want to deal with you!
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Wednesday, April 8th, 2009 AT 3:55 PM
Tiny
JERK
  • MEMBER
Which only means you have no clue of the answer. I have been to auto sales dealer and he gave me better information than you did, now I wish I never sent you any money, you did not earn it.
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Wednesday, April 8th, 2009 AT 4:54 PM

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