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Limp home mode out of no where

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I have a 1995 E320 Cabriolet with 29,000 miles. It is in pristine condition. However on about 5 occasions after driving the car for 5-10 miles the car would not accelerate past 20 mph. The engine would "buck" for lack of a better term between 1500 and 2000 rpms. It would idle correctly up to 1500 rpms. Then it feels like it is only firing on 5 cylinders. No check engine light comes on. In four of these occasions it started while turning right at low speed in a parking lot or in my neighborhood.I found if I pulled over, turned off the engine and sat for 5-10 minutes it would start up and act like it never happened .It could then goes days without happening again.I have only put about 400 miles on it as the second owner.
I have had one of the ignition coils replaced after it malfunctioned. This symptom is similar but different as it corrects itself and no sulphur smell. I have had the spark plugs replaced.
Looking in the E-Class Bible I found a similar sympton that points to the "accelerator pedal position sensor". Any thoughts on this one?

Thank you in advance for any responses
Mike Kelly

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Mike
1992 500E 128K miles
2000 E320
2002 E430
Previous cars
1967 300 SE-
1987 300TD Wagon
1984 240D Sedan
1995 E320 Sedan
1995- E320 Cabriolet
1973-280 SEL

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rogo's picture
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Re: Limp home mode out of no where

Take a close look at your engine wiring harness. With such low mileage, it may never have been replaced. Find a wire bundle where you can easily slit the outer covering of a wire bundle to expose the wires. If the insulation has turned to crumbs and powder, replace the harness. You can do a search of this forum for a lot of stories on W124 engine wiring harnesses.

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Virginia Beach VA

87 300SDL
95 E300D

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Vehicles
1985 190E
2000 C230 Kompressor
2011 C300
Re: Limp home mode out of no where

Hi Mike
If the harness is indeed bad we carry them in stock and also offer a MBCA discount.

Best regards
Ken Brown
Mercedes Benz of Monterey
831 375-2456

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Ken Brown
Mercedes-Benz of Monterey
888 375-2456
www.MontereyMercedes.com
www.Benzpartswholesale.com

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Re: Limp home mode out of no where

Limping, i.e. running poorly, is not necessarily the limp home mode. The limp home mode is an ASR creation and would have an ASR light on an ASR equipped car. Checking the fault codes on the 16 pin diagnostic connector near the battery would be a good place to start.

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Re: Limp home mode out of no where

Thank you all for your help. I am going to replace the wiring harness and will keep you posted.Just an FYI. It did it again yesterday and I decided to keep driving. As long as I kept it under 1500 rpms it would go through the gears and get up to surface street speeds. Anything over 1500 rpm it would buck like crazy.
Thanks again,Mike Kelly
ps has anyone ever had an odor issue with the seat pads after they might have got wet?

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Mike
1992 500E 128K miles
2000 E320
2002 E430
Previous cars
1967 300 SE-
1987 300TD Wagon
1984 240D Sedan
1995 E320 Sedan
1995- E320 Cabriolet
1973-280 SEL

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