Problem solved. Fuel injector pump had been only partially rebuilt, due to miscommunication between my mechanic and the rebuild specialist. My mechanic took back the unit, had their specialist complete the job, gave me a break on the second-round removal/re-installation labor, and now my 86 300SDL is a road rocket! Excellent acceleration. Fuel economy seems better too. My Mercedes has come back to life, my mechanic gave me a very fair deal (he's a great guy) and I'm a happy camper.
--- In diesel_mercedes@yahoogroups.com, "professormobesser" <professormobesser@...> wrote:
>
> I've had a recurrent problem with my 86 300SDL. It has about 310K on the engine. The initial acceleration can be very sluggish; rpm won't go above about 1500, even when I floor the accelerator, and the car just crawls until it starts to get above 10 or 15mph. Once I get above 15 or 20 mph, rpm will ramp up normally, kicking up above 3000 rpm or more before shifting to the next gear, and acceleration is fine. But initial acceleration, especially when starting up a hill from a stop, can be almost nil. My mechanic had the fuel injector pump rebuilt; that cured the problem for a while. Now the problem has returned. It seems worse when the engine is cold or when operating at higher altitudes; at 6000 feet above sea level, even after a long drive and a fully warmed-up engine, the car just wouldn't start up a steep hill from a stop. The engine ran; just no acceleration. I run my 300SDL on B99 biodiesel in summer and B50 in winter. Any ideas?
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