Thread: Fuel screw and idle speed interdependence.
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Old 01-31-2020, 04:53 AM
jetfiremuck jetfiremuck is offline
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Join Date: Dec 2009
Location: Jax.Fl
Vehicle: 03 vw tdi, 98 vw tdi x 2, 99 isuzu npr, 3x03 disco, 89 , 95 range rover.
Posts: 36
Default Fuel screw and idle speed interdependence.
Q. Do all 2.4 turbo diesel emit some visible smoke at idle? I've replaced nozzles and pop tested injectors. Pump timing at .90. I'm running an inter cooler. Some puffing from oil fill but no major cap dance.

I rebuilt the injection pump as the tit on the fuel control plate was broken . Took measurements on fuel screw etc. From what I understand turning fuel screw out reduces fuel. Idle speed drops , so bumping up idle screw brings it back to spec. No difference in gray smoke at idle. If I snap the throttle it comes back to idle fairly quickly.

So. Any other ideas to reduce this smoke. I have a 03 and 98 tdi. Both have some blow by but no visible smoke. Is the 1.6 idi a smoker at idle.
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