Hummer H3 For the Hummer driver who wants the rugged look and off road capabilities of the Hummer, but in a smaller size and with a more fuel economy friendly engine.

Oil/water in the Air Intake System (Brownish Foam)

  #11  
Old 02-26-2011, 11:43 PM
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Default The book sez

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.
 
  #12  
Old 03-10-2011, 06:14 PM
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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.
 
  #13  
Old 03-11-2011, 12:20 PM
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These are all 06 models... I'm going with head issue
 
  #14  
Old 03-11-2011, 05:17 PM
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Originally Posted by largemouthbass View Post
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.
 
  #15  
Old 03-11-2011, 05:45 PM
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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.
 
  #16  
Old 03-11-2011, 07:12 PM
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Originally Posted by Learjet405 View Post
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.
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.
 
  #17  
Old 03-11-2019, 04:18 PM
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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)
 
  #18  
Old 03-11-2019, 08:57 PM
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Way to go hummer_on_fumes. You beat Doc to the punch.
 
  #19  
Old 03-12-2019, 06:44 AM
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NEWBS, what are you gonna do?
 
  #20  
Old 03-12-2019, 09:09 AM
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Originally Posted by hummer_on_fumes View Post
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)
Oh boy....

 
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