W123, New Repair Kits Released in Past 60 Days

1977 280e backfires through intake

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.

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Difference between turbo issues, ALDA issues and wastgate

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!)

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