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Old 11-09-2004, 02:06 PM
Join Date: Aug 2004
Posts: 3
400E looses power when accelerating

This is a '93 400e with some 128K. Originally started having intermittent power loss while accelerating, which later escalated to very rough idling. No check light, no problems starting.

Replaced ignition cables, plugs, rotors and distributor caps. No effect.

Replaced upper wiring harness. Idling is OK now. Acceleration OK for a few miles then starts acting up but not as bad as before. Feels like half of the cylinders are off.

Any suggestions would be appreciated. I'd like to avoid replacing the large wiring harness if at all possible.


'93 400E
'95 SL500
'90 RR County (yes, i am a masochist)
'99 RR 4.6 HSE

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Old 11-09-2004, 03:24 PM
benzdude's Avatar
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Join Date: Sep 2004
Location: Denver, Colorado
Posts: 20
Engine Wiring Harness

It could be the engine wiring harness. If it is, you will want to replace it ASAP or it could fry the ECU. That's what happened to my 93 300E (M104 2.8L engine) a few weeks ago.
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Old 11-09-2004, 08:55 PM
pesuazo's Avatar
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Join Date: Oct 2002
Location: Near Raleigh, NC
Posts: 580
Well, these cars are known to have that problem (biodegradable wiring harness).
You can do a search in the forum, and read many postings, see pictures and learn the instructions on what problems to look for on the harnesses.
Then you can determine with a relative degree of certainty if the harness is the problem or not.
Another thing that comes to mind is the ignition coil.
IF you are unwilling to take the risk, my suggestion is to bring the car to a good MB technician and have him determine the cause of the problem.

1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
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