2001 duramax smokes when it idles 2001 chevy duramax it smokes at idle but not when above 1000 rpm
This happens when the vacuum in the manifold is at maximum and the air is drawn down past the valve stems into the combustion chamber. IT takes oil with it and so when you increase the RPM's ( moving off at lights)the burnt oil in the exhaust is expelled as a cloud of smoke . The fix here is to replace the valve stem seals that have gone hard/cracked and are no longer sealing on the valve stems
SOURCE: idle at 1500 to 2000 rpm
Most likely the throttle body gasket (between the throttle body and the intake manifold) is leaking.
SOURCE: 2000 chevy 3500 duramax has water in oil,runs
very, very seldom does the oil get get in the coolant, it is almost always the other way around, coolant in the oil, I have 35 years of experience to back me up on this. The problem is almost certain to be leaky head gaskets, one or both, but they should be done together anyway.
SOURCE: 1990 chevy truck with 454 v8 idles too high
One thing is to leave the IAC adjustment alone, you have a vachum leake betweent the mais air flow sensor or a intake leak.
SOURCE: 2001 2500hd duramax idle surge. doesn't do it all
Well there are quite a few things that casue a "surge" in a common rail diesel. You will need to check injector flow rates (scanner only). Fuel pressure regulator for pulsing (scanner only). Supply side fuel system for air leaks (seeing if it is sucking air into the system).
My bet would be the injectors, because you say the rpms aren't going up and down, which is usally what happens when the regulator goes bad, and when you **** air into the supply they have an extended crank. Report back with your findings.
SOURCE: RPM run high and slow to drop down
a vacuum leak will cause a high idle due to he fact more air is entering the engine which the computer will compensate by adding more fuel. also, a faulty fuel pressure regulator will increase fuel pressure delivering more fuel than required.
look for broken or detatched vacuum hoses. check fuel pressure; 30-50psi
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