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2001 24 valve Cummins

3K views 35 replies 14 participants last post by  firehawk 
#1 ·
Just got my Cummins back together after forever.... Needed a head gasket. Had head cleaned up, all new gaskets, new head bolts, etc.....
Starts fine, and runs fine(above idle), but seems like it's idling rough, and is blowing smoke(at idle). Check engine light was on this morning on my way to work....it's off now.
Where should I begin my investigation?
 
#32 ·
You can buy a fuel pressure gauge most anywhere for not much....you need to plumb it into the supply side either right at or just before the injection pump. The lift pump which is responsible for moving fuel from the tank to the injection pump is known to be a junk setup on these trucks....hence the popularity of the fass/airdog setups

Fuel pressure is important because the injection pump uses fuel for internal lubrication. Without good fuel pressure the pump will burn up fast. Dodge spec is like 5psi.....10-15psi is better.
 
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