2003 Envoy Codes - Page 2 - 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 > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

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  #11  
Old 01-28-2019, 06:14 PM
45Frank 45Frank is offline
Junior Member
 
2003 GMC Envoy SLT XL
Carbon Metallic 4.2L I6 4X4
Join Date: Sep 2018
Location: WNC
Posts: 65
Just to update. My Envoy since last post just continued to run worse as time went on since last post. So today I replaced the plugs, the rear two were loose enough I didn't need the ratchet just the extension. How do ya know the boot is all the way over the plug? I just dropped the coil straight down, there was little to no resistance when I pushed down and tightened the bolt.
Also cleaned the throttle body which I assume by other pictures was pretty dirty. Just took it to the PO so far and it runs smoother but still has a smooth rock, no miss. P/O is much better also.
Here's a few before and after pictures.
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  #12  
Old 02-05-2019, 09:02 AM
45Frank 45Frank is offline
Junior Member
 
2003 GMC Envoy SLT XL
Carbon Metallic 4.2L I6 4X4
Join Date: Sep 2018
Location: WNC
Posts: 65
OK I'm about to seriously take this thing out and us it for target practice.
It does have a little better pick up still but is back to idling like garbage to the point it sometimes feels like it wants to stall when ya take off.
Everytime I do anything it idles better for a short time then goes back to idling like garbage. I have a pending code of multi cyl misfire now.
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  #13  
Old 02-05-2019, 02:57 PM
TJBaker TJBaker is offline
New Member
 
2002 Chevy TrailBlazer LT
Summit White 4.2L I6 4X4
Join Date: Dec 2010
Location: Alcoa, TN
Posts: 27
Read through this thread and may have missed something in my reading, but have you checked for vacuum leaks?
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