P0102 p0113 p0304

[Chivo_tahoe]

Hi everyone im new on here i have a misfire on cyl 4 have not been able find, i replaced the air filter to a cold air intake setup as well with new MAF sensor was ok had p0171 p0174 did not pick up on my obd scanner only on my plugin from tmobile so i did not worry to much, a week or so after the new intake i was driving down highway fast not gnna lie when i cane to my excit my tahoe started misfiring cylinder 4 and another i have replaced spark plugs, wires, coil that day cleared it and nothing i had drive it home was not gnna let it over night and i replaced intake manifold gasket cause i was told a leak could cause it nd well nothing yet, i took it to get scanned maybe mine just wasnt picking up anything new nd now just p0304 p0102 and p0113 pop up I checked live data on my scanner at idle nd temp sensor shows roughly right temp but MAF stays at 0.0 i checked the volts in the maf harness with key on nd got one 12 v and 2 at 2.4 to 3v each so its sending current not sure what else todo ill post some pictures of whole live data maybe someone can see something i cant.
2010 Chevy Tahoe lt 5.3 230k miles

 

[wsteele]

Sometimes when a code was set is a question mark for those not experienced in reading them, which can throw your diagnostic process off.

Maybe consider re-installing the factory intake, clear the codes and start over?

Also, #4 is an AFM cylinder, so maybe pop the passenger side valve cover off and make sure the rockers on number 4 are nice and solid.

 

[Chivo_tahoe]

Sometimes when a code was set is a question mark for those not experienced in reading them, which can throw your diagnostic process off.

Maybe consider re-installing the factory intake, clear the codes and start over?

Also, #4 is an AFM cylinder, so maybe pop the passenger side valve cover off and make sure the rockers on number 4 are nice and solid.

Yeah can fix things but when comes to more complex codes i get thrown off my game. Ill try installing it first see if any changes. Nd by checking the rockers you mean like wiggle em see if its different from the rest of the cylinders?

 

[Fless]

Also clean the MAF with MAF cleaner. Aftermarket CAIs can allow dirt or oil to contaminate.

 

[wsteele]

Yeah can fix things but when comes to more complex codes i get thrown off my game. Ill try installing it first see if any changes. Nd by checking the rockers you mean like wiggle em see if its different from the rest of the cylinders?

Checking the rocker to make sure one of the lifters on #4 hasn't collapsed. AFM lifters are can collapse (a failure) and the net result is the valve on that lifter never opens. It results in a hard misfire on the cylinder. The rocker will be loose (kind of flopping around a little) as there won't be any pressure on the pushrod.

If an AFM lifter is collapsed, at a minimum, when you crank the engine with the valve cover off, you will see that rocker not operating properly.