i HAVE AN 04 LB7 DURAMAX WITH 112,000 MILES, WHEN IT IDOLS IT TENDS TO BLOW A BIG CLOUD OF BLUE SMOKE HAVE CHANGED THE FUEL AND AIR FILTER IT DOESN'T REGISTAR ANY CODES, AND ONCE AND A WHILE IT COULD SMELL A LITTLE LIKE ANIT FREEZE. HASN'T LOST ANY POWER AND FULE MILEAGE IS STILL THE SAME AS ALWAYS HAS BEEN. LOOKING FOR SOME IDEAS AND WHAT CAUSES THE BLUE SMOKE ONCE YOU START MOVING IT IT CLEARS OUT AND WHEN YOU PUNCH IT IS BLACK SMOKE. cONCERNED THE TRUCK HAS NEVER BEFORE BLOWN ALOT OF SMOKE

 

blue smoke is usually burning oil

Possibility - The coolant flow through the turbo unit may be reduced, which results in the temperature becoming so high that the engine oil builds carbon deposits around the turbine-side bearing. Over time these deposits reduce the oil flow through the bearing, which means that engine oil is forced past the turbine shaft seal and out into the exhaust pipe, resulting in blue smoke

 

might want to have the injectors checked. sounds like one may be leaking. if you let it goes you might hydro lock your engine. and that sucks. expecially at 7o mph on the freeway .....




dont ask how i know!

 

Wheres the Chevy guys on this??

 

Check the oil. Is it high or low? Does it smell like diesel fuel or is it discolored? How about coolant? Low coolant level? Is the coolant bubling?

I am thinking bad injector(s) or blown head gasket.

 

Clean your PCV system out. In fact, by-pass the thing. If you saw how much oil it pumps into your turbo, intercooler, and intake you would . When your PCV system begins to restrict you will get a lot of blue and white smoke. Try this first because its easy and cheap. If that doesnt do it then the next thing to check is the injectors like others have stated. At 114K on an 04 I'm willing to bet that one is going south. If you have access to a Tech II check and see what the balance rates are with the truck in gear. Ideally you want them to all read 0 but you will see fluctuation. If they get to be -+ 3 then you've got issues but it will at least point you in the right direction as to which one is bad.

 

any word Butch?

 

Last Call

 

My bet is on the injectors, mine pooped out on me at 115k. They fail in 2 different ways, either it fill the crank case up with diesel fuel, or cause smoke at idle. Could be a bad injector. You can take it to the stealership have them diagnose it for you for about 90 dollars, and if it is the injectors that are bad you should have them fixed because GM extended their injector warranty to 2004 lb7's. You have too many miles on your truck to have it fixed under the 100k engine warranty if something else is bad.

If you have any programmers on your truck take it off and make the truck as stock as possible, they usually don't care about exhaust or intake, and head for the dealer.

Here is the special policy for the lb7 injector issue print it out and keep it inside your center council and if they try to charge you for injectors shove that in their face.

hmm.... it seems like the special paper is too long

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yeah, "The text that you have entered is too long (12057 characters). Please shorten it to 10000 characters long."

Ill try and PM. you the special policy

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cant send pm either!

 

My 03 Dmax did this from the day I bought it..... Took it to the dealer on about the 5th time they replaced the Injectors and the problem went away....