P0304 P0443 white smoke misfire 07 Tahoe 5.3 4x4

[Jps0039]

Yeah have to wait till I have my dads help to pull the head. Once we are in we will know more. I’ll keep y’all posted for sure and appreciate all the advice. A rocker arm wouldn’t make it blow smoke would it?


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[OR VietVet]

You don't need to pull the head, YET. Pull the valve cover and inspect as stated above.

 

[avalonandl]

Pull valve cover and rotate the engine....

 

[Jps0039]

10-4, I’ll be looking for bad casket and collapsed lifter in this case correct? Anything else I should look for?


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[OR VietVet]

Do you man gasket and not casket? Spell check. The valve cover gasket will not come in to play on this problem. You can look for the rockers movement to see if they all move the same amount. Look for a broken valve spring. Look for a rocker stud or rocker problem.

 

[avalonandl]

Stuck/bent valve, broken rocker, etc....

 

[Jps0039]

Pulled valve cover. 4 the rocker arm is seized up we are about to pull it.


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[Jps0039]

Meant to say the #4 rocker arm is seized up. We are about to pull it to examine the push rod


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[Jps0039]

Pulled valve cover. 4 the rocker arm is seized up we are about to pull it.


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Pushrod is straight the rocker arm is tight. We are thinking probably a collapsed lifter. Going to try to use an additive to free it. If that doesn’t work we will replace lifter


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[OR VietVet]

Perfect time to at least replace all lifters if not the cam as well. When you remove the lifter make sure you get as good a look as possible of the cam surface.