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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 > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

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  #1  
Old 04-07-2019, 07:08 PM
harrygm harrygm is offline
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Join Date: Apr 2019
Posts: 3
tuneup

4.2 inline 2006 120.000 miles. all stock , starting to idle rough. Needs tuneup, what all needs to be changed.
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  #2  
Old 04-07-2019, 10:46 PM
chuck4788 chuck4788 is offline
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2008 Chevy TrailBlazer LT
Moondust Metallic 4.2L I6 4X4
Join Date: Dec 2007
Location: Mesa, AZ
Posts: 26
Take it to an auto parts store and they can scan for codes.
Probably the spark plugs and the 02 sensors.
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  #3  
Old 04-07-2019, 11:51 PM
Akrich Akrich is offline
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2005 Chevy TrailBlazer LT EXT
Dark Gray Metallic 4.2L I6 4X4
Join Date: Jun 2018
Location: Durango, Co.
Posts: 83
At 120,000 miles, i would change spark plugs, transfercase fluid, front snd rear differential oil, transmission oil. Clean the throttle body, replace the serpintine belt. Oil change.. thats about it.
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  #4  
Old 04-08-2019, 07:38 AM
harrygm harrygm is offline
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Are the best plugs 41-103 and what is the gap? which 02 sensor?
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  #5  
Old 04-08-2019, 08:01 AM
harrygm harrygm is offline
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forgot to mention, what make of gas filter to use?
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  #6  
Old 04-08-2019, 10:25 AM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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2004 GMC Envoy SLT
Graphite Metallic 4.2L I6 4X4
Join Date: Sep 2014
Location: NY
Posts: 2,084
Do not gap iridium plugs, you can damage the plug, they come already gapped.

If you stick with name brand filter, like AC Delco, you will be fine.
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  #7  
Old 04-10-2019, 08:44 PM
Ranger2003 Ranger2003 is offline
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2003 GMC Envoy SLE
Carbon Black Metallic 4.2L I6 2WD
Join Date: Apr 2016
Location: Chicago
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Tune up 120k miles

I have a 2003 envoy and did all that has been indicated, the plugs and cleaning the throttle body solved my idle concern.
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  #8  
Old 04-10-2019, 11:42 PM
Akrich Akrich is offline
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2005 Chevy TrailBlazer LT EXT
Dark Gray Metallic 4.2L I6 4X4
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Location: Durango, Co.
Posts: 83
I will vouch for NOT gapping the plugs. I thought I was carful and ended up having to replace some plugs after only 4,000 miles. My bad.
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  #9  
Old 04-11-2019, 07:43 AM
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negron59 negron59 is offline
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2005 GMC Envoy Denali XL
Summit White 5.3L V8 4X4
Join Date: Nov 2010
Location: Harrisburg, PA.
Posts: 3
Tuneup

I think the first and least expensive thing to start with is to Clean the throttle body, my 04 Trailblazer did that at 104K and as soonas I did it the problem cleared away.

Best of luck.
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  #10  
Old 04-11-2019, 09:35 AM
regionvoices regionvoices is offline
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Envoy GMC Envoy SLE
Indigo Blue Metallic 4.2L I6 4X4
Join Date: Nov 2013
Location: Indiana
Posts: 11
Check the variable valve timing solenoid Search Common Problems with envoy on YouTube and click The Car Doctor Very good information
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