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Originally Posted by Apotheoun
This is such an interesting discussion I can relate to, concerning my newly acquired 300SDS. The economy seems really really bad, and has taken that winterdiesel plunge, and then some! By the odometer, I am getting 15.9 MPG in mixed driving. The best correction scenario might yield 18 MPG, by adjusting for odometer error! Bear in mind this is a stick-shift variant, which one would think should help the economy. The engine seems to run well but makes excessive black smoke; no car tailing me will dare to get close. The RPMs are unusable below 2000 RPM in any gear above first. Well, I can go a lttle below 2000 in second too.
So what engine ailments am I facing? Injectors? Injection timing? Valve timing? Timing chain stretch? Alda? (What is the Alda?) The five cylinder turbodiesel is all new to my experience. As a newby, any insights will be appreciated. Thanks in advance!
Garth
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15 means something is way off. Especially with a stick... what are your RPMs at 70 mph? The least I have ever gotten is close to 19 mpg and that is really really beating on it (aka sliding around town and chirping tires). Check your wheels for brake caliper drag, do a valve adjustment. Make sure your engine gets up to 80 degrees celsius and does so in a reasonable amount of time, like 15,20 minutes. Could be a leak too, any diesel puddles under the car? I got 13 mpg once when my fuel line sprung a leak. It actually started and drove fine for the two days I waited for the part at the dealer. Do you get a massive smoke screen or waht? It might be your alda is over adjusted too. It's right by the injection pump. If it's a virgin one, it'll have a black cap on it. If it's been touched, it'll be a flathead screw with a nut around it.