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Old 01-24-2002, 12:46 PM
Snow bum
Join Date: Jan 2001
Location: Here and there . . .
Posts: 238
Power loss under a load

I have been intermitently experiencing this problem since April of last year, but in the past it has rarely manifested itself. Two days ago I replaced a fuel injector and washed and degreased my engine and the problem is back. Here are the symptoms:

When driving my 300D sometimes the I feel a strong loss of power. This usually happens at speeds greater than 60 mph, or at lower speeds if the engine is revved up high (>3000 rpms). Sometimes the engine does not regain power for a while, other times it surges, other times it is a momentary thing and everything returns to normal within a second. The best way to describe the feeling is to say that it feels like the fuel supply is being pinched. It feels like a fuel problem to me, but I am not a trained mechanic.

How should I go about dianosing this problem, and what should I do to fix it? Any help will be greatly appreciated, as I am taking my car on a road trip in the next month or so. Thank you.

The MBs:
1976 300D (W115) - 330K and still going (sort of)
1991 300D 2.5 Turbo - Sold at 221K
1983 280SEL - Sold at 206K
1981 300SD - Sold at 232K
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Old 01-24-2002, 04:04 PM
Posts: n/a
Power loss

How often do you wash the engine?
There is a pressure switch on the intake manifold, it senses boost pressue and opens the switch-over valve if it senses overboost,the switch is very sensitive to water.
Find and unplug the switch and take a ride if that fixes the problem replace the switch and be careful when washing.
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Old 01-24-2002, 07:00 PM
Snow bum
Join Date: Jan 2001
Location: Here and there . . .
Posts: 238
I think you helped me solve the problem. I found the little pressure transducer you were talking about, and the connecting cable was loose. I took it off, cleaned the post, reinstalled, and drove the car for twenty miles with no apparent problem. Now, the problem is intermitent, so I'm not sure it's fixed, but it appears to be rectified. Thank you so much for your help.
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Old 01-24-2002, 08:07 PM
Senior Member
Join Date: Apr 2001
Location: Beech Island, S.C.
Posts: 468
How long has it been since you replaced the fuel filters. A clogged fuel filter will cause the same problem you described.
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Old 01-24-2002, 09:05 PM
Snow bum
Join Date: Jan 2001
Location: Here and there . . .
Posts: 238
The filters have been replaced in the last six months.
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