W123

My 1977 280e runs roughly. New fuel pump, fuel filter, the usual tune up. It is a little hard to start when cold or warm. It backfires out of the intake when you step on the throttle. I have disconnected the intake vacuum line and plugged it that leads to the cabin. The EGR valve has been plugged off as well. Most places I have read always say the backfire issue is almost always vacuum related in this car.I've checked all of the rubber vacuum connectors and they seem to be good and snug fitting.THe car idles at around 550 RPMs.

I have a 1985 Turbo federal model...no particulate filter. I bought the turbo rebuild kit and tested the turbo beforehand. It only boosts to 7.5 psi without the installation of the kit (in summeer). I have not rebuilt the turbo yet. The car is extremely slow off the line and in cold weather....I can floor it for three minutes with no increase in RPM. (Some people even cut my block heater cord off because it smoked so much....as if that would stop me!)

I have a 300D with 250k. recently the car wouldn't start or try to fire up at all until you shut the switch and try a second time and it fires right up. this is a recurring problem but it will always fire right up on the second try. The fuel lines have been replaced a few months ago all the way to the tank and there are no fuel leaks anywhere so I figured the lift pump might be loosing its prime and I tried a little experiment. Before starting up in the morning I used the hand primer pump about 10 strokes and she fired right up first try.

Hi Team,

Australia never got the factory turbodiesels. Aside from a lower quoted output from the 950, just wondering what other differences there are between it and the .951 and if there are any issues in parts swapping, transmissions, lines etc.

Thanks

Dweezil