Need help with a 1984 300 TD. Very slow acceleration, picks up when pedal is pressed to the floor. Adjusted the IP, and adjusted the valves. Verified timing chain with the camshaft and crankshaft settings at TDC.

Cleaned out the gas filter as well. Still slow. It will go from 0 to 60 in about 20 seconds with pedal all the way to the floor.

Any ideas from anyone?

what are your boost readings? Before and after the valve?

did you check the prefilter and in tank strainer?

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

excuse me for being an @ss, but please call it a fuel filter
Thanks

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-Randy Wakefield

1969 220D 4 speed (parts car)
1976 280C
1976 280S
1981 240D 4 speed (parts car)
1982 300D
1983 300TD (Ivory)
1983 300TD (gold)
1985 300TD (gray)
1987 190D 2.5
1970 280SEL (sold)
1977 240D 4 speed (sold)
1974 280 (rusted to death)
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1927 Chevy 4 door sedan
1938 Chevy 2 door sedan
1950 Willys Jeepster
1955 Studebaker President 4 door
1977 Ford F250
1979 Glastron 17'
1948 John Deere A
1960 John Deere 2010
1979 Satoh S650G
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2000 Bichon (Doby)

First - as a previous comment hinted, check that your boost control valve is clean. Cleaning out the carbon in the boost control valve will restore some pep, and ought to be done about once a year if you drive the car a lot and it has high mileage.

Second - Fuel pump timing. I have no idea how to do this, but while I was overseas I had my 300CD taken to an independent mercedes shop that suggested this adjustment. The car runs like never before - it feels like a completely different car. Nobody else even suggests or mentions adjusting the fuel pump (or fuel compressor as it may be called) timing. Instead, shops usually give the same un-helpful advice you've likely received: "Well, ya know, those cars never were very fast." Find someone who knows how to do this and you will be pleasantly surprised at how much better the car runs.

Good luck

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Gil

2004 ML350
1984 300CD; Ivory (sold)

Haven't checked the boost readings yet. That is where I will start tomorrow. Fuel filter has been replaced and strainer is clean. I suspect the ALDA but need more checking. Don't know what adjustments are needed yet.

Definitely check and clean all the fittings (particularly the banjo fitting at the back of the manifold) and lines associated with the overboost and ALDA. My wagon was a PIG until I did all the above and cranked the ALDA. My ALDA is now fully backed-out and I think it could probably use some shims under it as well since there's barely any smoke at full throttle.

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Never a dull moment at Berry Hill Farm.