1995 e320 starting problems - Mercedes-Benz Forum
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#1 (permalink) Old 12-15-2010, 07:03 AM
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1995 e320 starting problems

I have a 1995 e320 sedan with 80k on the odometer. I live in Wilmington, DE. The car gets infrequent use. My wife was having starting problems, (even back when it was warm outside). They would come and go. Sometimes it would start, other times it would not. Engine always cranks but doesn't seem to get enough gas. This is what the local mechanic told me. He couldn't replicate, (the non-starting when he had the vehicle) so he didn't really know how to solve the problem. He said go to the dealership.

I read here, and at other sites on the Web that this problem is common in this year and model. I replaced the fuel pump relay, charged the battery, (the car sits a lot and the battery was weak) and bang starts right up. Come down the next morning and back to cranks and won't start. I'm an aging desk jockey, not a mechanic, is there anything I can do to fix this problem? Wife is pissed I won't go to dealership. Not for things I can "plug in" I told her. There are other cars for her to use but she wants this one fixed, (as do I). Any help would be greatly appreciated (and followed). Gregg

Last edited by Gregg Bunitsky; 12-15-2010 at 07:06 AM. Reason: word spelled incorrectly
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#2 (permalink) Old 12-15-2010, 07:40 AM
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With a car that has such low miles, I'd start investigating if the wiring harness and/or electronic throttle (ETA) has been replaced yet along with the OVP relay.

Do a search and you'll know what I mean. The 92-97MB used a treehugger friendly type wiring which was supposed to be eco-friendly and be recycled at the end of the car's lifespan. Only problem is that the W124s last a LOT longer than your average car.
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#3 (permalink) Old 12-15-2010, 11:48 PM
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Try to reweld OVP ralay!
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#4 (permalink) Old 12-16-2010, 07:29 AM
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Originally Posted by E36c_amg View Post
Try to reweld OVP ralay!
That's only a band-aid fix and a waste of time. The OVP internals fail and replacement is the only cure.
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#5 (permalink) Old 12-16-2010, 09:53 AM
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I had very similar issues with a 93 300E m104 3.2L, it would sometime just not start, seemed like it was not getting any fuel, but it had pressure at the fuel rail & the pump was spinning. I'm not getting any other issues that might point to a bad OVP like bad idle or cruise issues, so I went with the CPS, Crank Position Sensor, the one that goes from the EZL to near the starter at the flywheel. My car ahd gotten to the point of absolutely no start at all. After the replacement of the CPS, instant start. I've started it multiple times since without issue, but the car is currently banished to the garage until the roads no longer have salt on them. I vote to change the CPS, $129 + labor , which is about medium difficulty do to location and routing of the wire, but technically easy - unplug, unbolt, remove, replace, rebolt, replug...
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#6 (permalink) Old 12-16-2010, 10:45 AM
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I'm still leaning towards the wiring harness/ETA given the low mileage as it will give identical symptoms and I suspect this vehicle still has the original wiring.

It's an issue that needs to be addressed (if the wiring hasn't been replaced yet) before it shorts out the engine computer, which is $$$$$.

The CPS is fairly robust. Haven't had to change mine yet at 150K.
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#7 (permalink) Old 12-16-2010, 02:04 PM
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FYI - My car has 90K & no abuse, so I still vote for CPS, but one can't rule out the other stuff either...
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#8 (permalink) Old 12-17-2010, 03:24 AM
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Originally Posted by sbaert View Post
That's only a band-aid fix and a waste of time. The OVP internals fail and replacement is the only cure.

Well rewelding OVP helped me....and after two years it still works fine...
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#9 (permalink) Old 12-17-2010, 06:37 AM
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No start

My 95 e-320 would start get warm then no start till cooled off,replaced the
Crank Positioning Sensor,no more problems.
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#10 (permalink) Old 01-16-2011, 08:59 AM
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Hi and thanks to all who responded. Not being a mechanic, (just an aging lawyer) I went with the easiest fix that I could pull off myself. I replaced the OVP. Wow! You wouldn't know I ever had a problem. Starts right up! Thanks for all the good information. It was truly insightful and invaluable. I love when I can actually fix something myself and you guys helped. I would never have known to replace that relay if not for the Forum. Gregg
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