I have a 1984 300D Turbo. A week ago I was asked to test drive a non-turbo 300D and found it had a lot more power than my 300D Trubo at lower speed. I was shocked. And spent weekend in the mountains with overnight temperature at about 22ºF. The car started OK. I let it warm up for about 5 - 10 minutes. When I drove it, I could hardly get it to go more than 10mph. And it is slightly better with warmer temps around 50ºF in the morning. It has new fuel filters (both). I never use bio-D or VO. It always starts easily. When it stops, there's a little hesitation. But that is the vacuum, not lack of compression. As soon as the vacuum kicks in, the engine stops immediately. I drove at 55mph for 3 hours and got 38mpg.

Once warmed up and at higher speeds it has a lot of pick-up.

So why is this thing a dog at lower speeds?

Thank you,
Paul

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1984 300D Turbo

It sounds kind of like the fuel may be clouding (happens before gelling). This loads the fuel filters up with wax crystals and clog them. When the fuel gets warmer, the wax crystals melt and the fuel flows normally. Various additives are available to lower the cloud and gel points. You can also try adding in a little (few gallons) of kerosene or an even smaller amount of regular unleaded gas (RUG).

You'd probably get a better response if you posted this in the Diesel Discussion. Many of us diesel heads don't read this section. I'm just here because I'm procrastinating about doing my homework

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

Thanks Skippy. I'll go to the other area with this question....

Paul

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1984 300D Turbo