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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 07-13-2019, 07:41 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
Still here, Cat converter for $850.00 still runs like ****tttt!!!!!!!
Took it back AGAIN and he had a different scanner/computer that is supposedly can check every diagnosis possible on the hunk of scrap. He is saying head with no explanation, he ran a comp test yet again and all cyl are good.
He showed me where the the diagnosis says something like 200,000 multi cyl misfires while I was there. [B][I][U]What can possible cause this?????????????[/U][/I][/B]
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  #12  
Old 07-25-2019, 06:32 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 was really going to junk the piece of garbage but metal is only $2.50 a hundred here.
Went to an old mechanic locally who has no idea what a computer even is. Dealer, two others and now him. Dealer just said drive it maybe it will get better, another wants to change the head, and this old timer. He agreed that if it was an old car he would say the timing was way off. So he suggested I change it again changed the VVT. Just like the last one it runs awesome again, the 1st one ran great for about a week or two then it slowly deteriorated.
[B][I][U][COLOR="Red"]What would make these go bad?[/COLOR][/U][/I][/B]
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