07 TB LS I6 - Resonator box has water and yellow gunk - 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 > Air Induction

Air Induction Performance Air Intake/Air Induction Modifications

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  #1  
Old 12-28-2017, 12:57 PM
pck pck is offline
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2007 Chevy TrailBlazer LS
Indigo Blue Metallic 4.2L I6 4X4
Join Date: Jan 2012
Location: appleton, WI
Posts: 3
07 TB LS I6 - Resonator box has water and yellow gunk

Was driving in town and got a REP light. Limped home and pulled the air cleaner duct off resonator box, found water (not just wet, I could pour the water out of the resonator) and yellowish gunk in resonator. Pulled resonator off and found PVC hose plugged with yellowish gunk and water. Opened oil filler cap and found yellowish gunk on cap and opening. What is causing this water/gunk to form in the induction PVC system? I'm suspecting possibly my driving scenario might be contributing to the problem: It's been very cold here in WI and my drive to work is very short, barely warms up by the time I arrive. Is this causing the moisture build-up? I'm pulling the throttle body this weekend for cleaning as it was dirty/oily film. Thanks for your help. PCK
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  #2  
Old 12-29-2017, 09:57 PM
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GLester GLester is offline
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2005 Chevy TrailBlazer LS
Summit White 4.2L I6 4X4
Join Date: Aug 2017
Location: Hensley AR.
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Sounds like your engine is not fully warming up. Also, the type of oil you use can contribute to the yellow gunk, Quaker State oil used to be bad for that. But, it would now be a good idea to flush your oil system, put in according to the can, some Seafoam into the oil, and run it for about 50 to 100 miles and drain the oil and change the filter. Put in some cheap oil along with half as much Seafoam as before, and run another 50 to 100 miles and change again to what you would regularly run. The system should now be clean, and if you clean the PCV system and the box, and make sure you run the engine for more than 5 minutes, hopefully it won't be a problem.

Gene
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Old 12-30-2017, 12:25 AM
pck pck is offline
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2007 Chevy TrailBlazer LS
Indigo Blue Metallic 4.2L I6 4X4
Join Date: Jan 2012
Location: appleton, WI
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Thanks Gene, I cleaned my throttle body and the engine ran great. My idle speed is back to normal (was low). I'm a little hesitant to add seafoam to the oil. Doesn't it thin the oil to much?
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Old 12-30-2017, 10:26 AM
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GLester GLester is offline
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2005 Chevy TrailBlazer LS
Summit White 4.2L I6 4X4
Join Date: Aug 2017
Location: Hensley AR.
Posts: 65
If you follow the instructions on the can, it is not an issue. Have used it for years without any problems in motorcycles, cars and trucks. Anytime I buy a used vehicle, including this 05 TB that I have, I usually do a engine flush to get any gunk out of it. I had one vehicle, I had to flush it out about 4 times to get the buildup of crap out of it.

Gene
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