E-Class (W124) 1984-1995: E 260, E 300, E 320, E 420, E 500 (Includes CE, T, TD models)

problem accelerating on highway -94 e320

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Old 08-05-2007, 10:11 PM
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problem accelerating on highway -94 e320

last week had my fuel pump relay replaced at the dealer due to startup problems. today i was was driving home from south jersey (3hr ride) when i began having acceleration problems on the higway. every 15 minutes or so while cruising along around 65mph the car begins to decelerate to about 40mph. the accelerator goes "numb" until the mph drops, then responds again. about 15 minutes of cruising at 65'ish again it does this again. there is no check engine light. what do you guys think?

car is a '94 e320, bought new, original owner, have around 200,000 miles
Old 08-06-2007, 05:11 PM
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1994 E320
Sounds like it starts running on fewer cylinders for a period of time. A few years ago I had a problem where the car was running on only 2 cylinders and it was really, really sluggish. It is the only thing I can think of. No idea why your check engine indicator is not lighting up though.
Old 08-06-2007, 11:13 PM
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'90 500SL '07 C280 '98 E320, '19 C43
Have you replaced the wiring harness yet??
Old 08-07-2007, 10:22 PM
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E320
Originally Posted by Brian McL
Have you replaced the wiring harness yet??
Probably your problem. This exact thing was happening to me and its the harness.

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