95 E420 Acceleration and idle issues - Mercedes-Benz Forum

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post #1 of 13 (permalink) Old 01-07-2011, 03:17 PM Thread Starter
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Vehicle: 1995 Mercedes Benz E420
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95 E420 Acceleration and idle issues

Hi, folks, I'm new to the forum, but I've been reading articles here for the past few days while dealing with a persistent issue in my 95 E420. The problem started just after New Year's Day after I went and filled up my car with premium. On the way back to my apartment my car suddenly started to lurch at 1,000 rpms and wouldn't go faster than 20 mph. I pulled off to the side and shut the car off thinking it was a random hiccup since my car has had rough idling issues before which would cause it to die while stopped. The issue persisted all the way home and has been a thorn in my side since. It isn't an issue that occurs only when in drive, it happens in every gear.

I read the codes on the car and I consistently get a 10 code (voltage too high or low to MAF sensor). At first I thought I might have a vacuum problem and my dad found a hose that had come lose under the passenger distributor which we reconnected and thought we'd fixed the problem after starting the car up and slowly revving the engine. The next day I tried to drive my car and it worked fine all the way to Walmart, but when I tried to leave it started acting up again. I checked the vacuum connector and it had come loose so I reattached it, but that didn't fix the problem.

Today I got out and cleaned my MAF sensor after trying to research this problem here on the forum, but after reassembling everything the issue still remains although now the car will straighten up and run for a little while before going back to lurching at 1,000 rpms.

Any help would be greatly appreciated, the only thing I know to do at the moment is to replace the MAF sensor.
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post #2 of 13 (permalink) Old 01-07-2011, 05:01 PM
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Welcome to the forum.
If you read the forum a bit more -you will find lot of experience that MAF cleaning helps a little or not at all.
Your engine was used in W124 and W210 models and possible in few more. Do a search in those sections for possible answer there already.
Aging vacuum system on W124 can be a nightmare, so brace yourself.
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post #3 of 13 (permalink) Old 01-07-2011, 09:36 PM
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I thought the only E420 was the 1997 MY so thanks for the information. As advised, check the W124 forum for answers. If it turns out to be the MAF cleaning it will only buy you a little time. It's probably time to replace it and it is an easy DIY but don't buy one from eBay.

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post #4 of 13 (permalink) Old 01-07-2011, 10:08 PM
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How's your engine wiring harness? I doubt there's anything wrong with your MAF. It's a hot wire (not hot film) which is pretty much good for the life of the car if you clean it every 5 or 10 years. You're saying you're getting one flash (no codes) on pins 4, 7, 8 and 17?
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post #5 of 13 (permalink) Old 01-08-2011, 12:18 PM Thread Starter
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Wiring harness and codes

I'll be sure to check the W124 forum. As for the codes I've only been able to use the code system under the hood on the passenger side and don't have anyway to read a specific pin, just the LED light. To my knowledge the wiring harness is good, the car has previous repair paperwork in it and one of the repairs a few years back was a new harness if memory serves.
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post #6 of 13 (permalink) Old 01-08-2011, 03:08 PM
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You can build the code reader for the other pins for about $10 - try a search. That would be my next step. Also make sure there aren't more codes on the DM.
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post #7 of 13 (permalink) Old 02-04-2011, 11:58 PM
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hi, my S420 has just started doing the same. Took it to the dealership who I know quite well LOL. hooked to the scaner and found a very high reading ( flashing 50 - 70, ) when it should be ( 10 - 15 ), causeing the engine to hesitate and lurch exactly like yours, to fill you in i have a list of new parts in mine includining a new MAF sensor, spark leads, plugs, dizzy caps and rotors, fuel pumps and filter yet it still exisits to lurch the only thing left is the wiring harness even though it has been replaced by the previous owner before. The head tech there whom i know personally agrees that there is a higher than normal resistance in one or more of the wires or conections of the harness which may not just be the engine harness as it could be in the main harness instead. If i get mine solved before you I shall update you with what mine is to help you and vice versa. hope this helps and steers you in a forward direction.
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post #8 of 13 (permalink) Old 02-05-2011, 12:13 PM Thread Starter
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That's the most help I've had so far. I'm about to replace my caps and rotors since they're pretty corroded anyway. I was hoping the harness wouldn't be an issue since just like your car the previous owner replaced the harness once already.
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post #9 of 13 (permalink) Old 02-05-2011, 03:15 PM
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IMO... fuel somewhere... is not getting to the engine....

Jean-Pierre

There are no cars built south of Munich
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post #10 of 13 (permalink) Old 02-07-2011, 11:10 AM Thread Starter
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That was my first thought. I replaced the fuel line leading to the fuel filter and pump, but the problem's persisted. I thought it might be the fuel pump, but I'm not 100%.
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