Need Help locating a vacuum leak - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 10-26-2010, 11:00 AM
meierrh meierrh is offline
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2006 Chevy TrailBlazer LS EXT
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Need Help locating a vacuum leak

My 06 EXT TB with 100,000 miles on it is throwing codes P0506 and P0106. I took off throttle body and cleaned it (it was filthy) and I took out camshaft position solenoid and cleaned it. Whiledoing work the battery was disconnected. I reassembled everything hooked up battery and started engine and it still had a rough idle at startup. I figured the computer needed to adjust itself but I also hear what I think is a vacuum leak somewhere by the power steering pump but I cannot locate it. The codes were cleared and drove the car for a couiple of days with the same rough idle at cold start but the thing seemed to run ok once engione was warm. Then the outside temperature got warm enough to need the AC and as soon as we turned it on the service engine light cam back on. I have not gone and had the code read yet but suspect the engine running lean due to cacuum leak which I cannot find. Any help would be appreciated.
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  #2  
Old 10-26-2010, 11:04 AM
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the roadie the roadie is offline
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Both the hoses reconnected to the intake resonator? The right side smaller one runs the fuel pressure regulator, and if it's off, you will also get a 900 RPM idle instead of 600 IIRC. Brake booster hose also reconnected?
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  #3  
Old 10-26-2010, 11:07 AM
Loverotties Loverotties is offline
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Make a soapy solution and spray the area and look for the bubbles.
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  #4  
Old 10-26-2010, 11:52 AM
meierrh meierrh is offline
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Roadie,
Do you have a diagram pointing to the two hose locations you describe?
I thought I reconnected everything but I am not a mechanic so I may have missed something beause I only recall the one big tube on the resonator. It has been two weeks ago since I did this project so the brain has had time to forget. I will have to check later on the RPM's.
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Old 10-27-2010, 10:47 AM
meierrh meierrh is offline
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Roadie,
I checked the RPM's this morning and the engine is running at 900 RPM's. Could you tell me more on location of fuel pressure regulator, so I can check connection?
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  #6  
Old 10-27-2010, 11:27 AM
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the roadie the roadie is offline
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Quote:
Originally Posted by Loverotties View Post
Make a soapy solution and spray the area and look for the bubbles.
For a VACUUM leak?

Quote:
Originally Posted by meierrh View Post
Roadie,
I checked the RPM's this morning and the engine is running at 900 RPM's. Could you tell me more on location of fuel pressure regulator, so I can check connection?
I had a picture, but can't locate it right now. It's about a 1/4" hose with a rubber fitting on the end, that goes onto a barb on the driver's side of the intake resonator, towards the front of the vehicle. Should be obviously hissing vacuum if the hose isn't connected.
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  #7  
Old 10-27-2010, 11:33 AM
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hatchet669 hatchet669 is offline
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DONT USE SOAPY WATER!!! as roadie said... its a vaccum leak not a air leak... dont want soapy water in your engine do ya if u hit the rite spot

Quote:
Originally Posted by the roadie View Post
I had a picture, but can't locate it right now. It's about a 1/4" hose with a rubber fitting on the end, that goes onto a barb on the driver's side of the intake resonator, towards the front of the vehicle. Should be obviously hissing vacuum if the hose isn't connected.
if i'm not mistaken roadie i dont think the 06's have this... if i remeber correctly as it has come up with CAI they dont have that connection... dont take my word on this i'm going off memory.. going to go look and confirm this...

edit: i cant find a good clear picture of it (which someone posted before to show the difference between the 2 different ones that changed in 06) but every 06 CAI i have seen looks like this..
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  #8  
Old 10-27-2010, 11:34 AM
meierrh meierrh is offline
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I have found on a past post that states the 06 TB does not have a fuel pressure regulator, is this true?
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  #9  
Old 10-27-2010, 12:08 PM
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hatchet669 hatchet669 is offline
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Quote:
Originally Posted by meierrh View Post
I have found on a past post that states the 06 TB does not have a fuel pressure regulator, is this true?
i would think they do.. the design just changed from the earlier motor... the 05 and less had a tube from the intake to the pressure regulator... 06+ didnt have this tube...
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  #10  
Old 10-27-2010, 08:31 PM
meierrh meierrh is offline
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OK -I don't believe it is a vacuum leak anymore but I have a question about a click or clunk sound coming from throttle body when engine is shut off. Could the throttle body be going bad
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