cold idle, hard shift

[Joe Marroso]

Hello Gentlemen,

(I have scoured the Forum for related topics, this is different)

When my 85 300sd is cold it seems as though the engine doesn't want to take fuel under load. I have had the vacuum assemblies adjusted and bypassed by a professional (a very competant man). The cold shifts are jarring and the vehicle is, well, unsafe to drive due to its unresponsiveness. That condition lasts for a minute or two, and then the car responds and shifts smoothly. There is no black smoke.

A prolonged idle does not change the condition, only 1/8 of a mile of driving does.

The mechanic has fully adjusted the set screw on the IP and says there is accumulated wear that prevents a proper idle. He said, "Run it and see what happens." The car runs and shifts beautifully when warmed up.

The ALDA was bypassed and the sensor is set to let the turbo engage at lower RPMs.

It just doesn't seem possible that the diesel that can run so quietly and powerfully could have a damaged Injection Pump. I am worried that the cold winter starts will be very difficult.

Somebody please tell me I don't have to tear apart an IP to fix a cold idle.

Suggestions?