Question about 2001 Chevrolet Silverado 2500
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
Posted on May 11, 2014
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Posted on Jan 02, 2017
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.
Posted on May 13, 2009
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.
Posted on Nov 24, 2009
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
Posted on Apr 09, 2010
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