Misfire cylinder 4

[Therea1batman93]

i have a 2010 Chevy Tahoe, had it for 2 months less the 140000 miles on it, ran good at 1st but oil sensor light came on, then it said I had a misfire in cylinders 4, replaced the spark plugs and changed the packs around but still getting a misfire code on cylinder 4, I’m at a lose here. What could it be? Just got the truck so I’m deep in debt with it.

 

[Fless]

Were the plug wires moved along with the coil packs? How old are the wires?

 

[Therea1batman93]

Were the plug wires moved along with the coil packs? How old are the wires?

They were checked but no damage could be found and they are 9 years old, never been changed

 

[Fless]

Try swapping a couple to see if the misfire follows the wire. Consider new wires.

 

[Therea1batman93]

Try swapping a couple to see if the misfire follows the wire. Consider new wires.

Will try that. Was told it could be the lifters? If so I’m done for.....

 

[Kraig]

Is it a misfire like you have to listen closely and maybe it sorta has a little miss or is it shaking pretty violently at idle? If you have an AFM lifter gone, it will likely run VERY CRAPPY at idle.

 

[Therea1batman93]

Is it a misfire like you have to listen closely and maybe it sorta has a little miss or is it shaking pretty violently at idle? If you have an AFM lifter gone, it will likely run VERY CRAPPY at idle.

Yeah it shakes some, doesn’t run to bad. It just shakes while idling

 

[Kraig]

Yeah... that’s not good if you pull an injector or plug wire off, it sorta stumbles and runs slightly rough but when a lifter goes bad and a cylinder either isn’t getting air in, isn’t letting the exhaust out the exhaust port, or is just pumping air straight through, it gets a little rowdy. My guess is it’a time for a at least a couple lifters, and lifter tray, head gasket, etc.

 

[Therea1batman93]

Yeah... that’s not good if you pull an injector or plug wire off, it sorta stumbles and runs slightly rough but when a lifter goes bad and a cylinder either isn’t getting air in, isn’t letting the exhaust out the exhaust port, or is just pumping air straight through, it gets a little rowdy. My guess is it’a time for a at least a couple lifters, and lifter tray, head gasket, etc.

There’s no tick thou, if it was a bad lifter wouldn’t it have a tick