short quote,,,if abnormal operating conditions arise the system lets excessive blowby gases back into the air resonator to be burned in normal combustion..... so you get to guess what causes the abnormal blowby gases. the pcv "pipe is a .1 in orfice lets crankcase gases into the intake,not the resonator,prob baffled as mentioned,so the gases/oil gets into the resonator by going backwards thru the long hose. obviously if it continues,its somthing "abnormal",not fun.

 

Speaking of cleaning the throttle body, has anyone heard that you can mess up the Throttle valve by opening it up manually to spay cleaner inside. Mine idles rough after cleaning and is giving a very intermittent cylinder #4 Misfire code. I am being told I might have messed up the throttle body by doing this. Never had a problem on any other truck but looks like this one is motor controlled instead of spring operated.

 

These are all 06 models... I'm going with head issue

 

As soon as I get a weekend in the 50's again, I'll do a compression test and post the results.

 

For what its worth.., Something similar happened to my '93 Caprice. It turned out to be a bad radiator cap not allowing the enging to get up to proper operating temperature.

 

Did that "someone" explain if the throttle body is now messed up why it would only throw a code in the #4 cylinder? Or how it could "mess it up?" That logic seems suspect.

If this happened only after you cleaned the throttle body have you checked your reassembly? Did you do something to that coil pack during reassembly? Or as stated already, head issue.

 

You just replied to an 8 year old thread and someone who's account's last activity was 02-28-2011
Cue Doc blowing a gasket (in his head not Hummer)

 

Way to go hummer_on_fumes. You beat Doc to the punch.

 

NEWBS, what are you gonna do?

 

Oh boy....