Just bought a 2007 Tahoe LTZ, have a few ?'s

[a_kraker99]

yeah, it probably isn't enough to trip a code. I am just monitoring it with my scanner.

 

[a_kraker99]

The odd thing is that I don't think it was misfiring before I ran a can of Techron through the system. I wonder if the Techron knocked some crud off in the fuel tank or lines and clogged up ones of my injectors.

 

[PlazaEJ]

If it was small enough to get passed the fuel filter, I wouldn't think it would clog an injector.

My suggestion, try cleaning your MAF. Cheap, easy, and if doesn't completely cure your ills, nothing hurt.

EJ

 

[a_kraker99]

Yeah, if it was a random misfire on all cylinders I could see that. I planned on doing a MAF and throttle body cleaning soon anyway. Is there any procedure for relearning idle after cleaning the throttle body?

 

[PlazaEJ]

Yeah, if it was a random misfire on all cylinders I could see that. I planned on doing a MAF and throttle body cleaning soon anyway. Is there any procedure for relearning idle after cleaning the throttle body?

Nope. Just drive like normal.

 

[a_kraker99]

cleaned the throttle body and MAF and it didn't seem to help. I noticed that the misfire is much worse while the engine is cold. Once it warms up I get around 1 misfire every 5 seconds or so. My idle seems a little rough though even when misfires don't show up.