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TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
Vortec 4.2L I-6
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190,000 Miles 2004 TB EXT 4.2
KNBlazer
Feb 18, 2014
2
Replies
68
Views
4K
Aug 16, 2014
loondog33
C
Rough idle in drive, runs rich, catalyst P code
coleman
Mar 1, 2013
2
Replies
69
Views
5K
Mar 21, 2014
fixnux
F
M
Coolant thermostat/temp questions
Marksman762
Dec 11, 2013
2
Replies
69
Views
22K
Mar 30, 2014
jes1888
J
S
2005 Chevy TB LS I6 4.2 starts but stalls 2-3 seconds later
Sean
Jan 28, 2015
2
Replies
70
Views
5K
Feb 17, 2015
Sean
S
Switching to Synthetic
03envoy
Feb 4, 2012
2
Replies
71
Views
5K
Mar 3, 2012
gmcman
Dreaded knock sound is starting
gmcman
Apr 13, 2014
2
Replies
72
Views
33K
Apr 20, 2015
gmac310
DIY air intake with IAT sensor
Shdwdrgn
Dec 9, 2011
2
Replies
76
Views
16K
Apr 2, 2013
ShadowClutch
S
Need some Advice new Timkin Wheel hubs on there way
jeffro312
Mar 25, 2013
2
Replies
76
Views
4K
Mar 29, 2013
CaptainXL
C
4.2 to 5.3 Engine Swap Talk
groundshock
Mar 13, 2013
2
Replies
77
Views
55K
Oct 5, 2019
mrrsm
A
PCMFORLESS NEW E-Fan Setup and PCMFORLESS INTAKE
andy702252
Mar 26, 2012
2
3
Replies
80
Views
8K
Apr 30, 2012
limequat
NEED HELP
P0300 p1514, engine power reduced, white smoke
yazan
Mar 18, 2019
2
3
Replies
81
Views
13K
May 8, 2019
Mooseman
2 quarts of oil, no big symptoms and no leaks?
Gerbil21
Jan 23, 2015
2
3
Replies
81
Views
11K
Feb 20, 2015
Gerbil21
S
stuck spark plugs
sunliner
Jan 2, 2015
2
3
Replies
82
Views
12K
Jan 21, 2015
AWD V8
Need engine: Pull from PickNPull or Buy already pulled?
limequat
Aug 31, 2018
2
3
Replies
83
Views
15K
Dec 25, 2018
Traz
Z
NEED HELP
05 Trailblazer Fuel Gauge Problem. Bad PCM?
Zmoney
Jun 4, 2021
2
3
Replies
85
Views
8K
Sep 8, 2021
Mramses
M
S
Low oil pressure on DIC, check gauges light and oil pressure gauge is low
Steevo
Jan 10, 2018
2
3
Replies
86
Views
11K
Feb 17, 2018
Steevo
S
S
Pcmforless Avantages
snowyredenvoy
Dec 7, 2011
2
3
Replies
88
Views
9K
Mar 7, 2012
borretje
Removing Secondary Air Injection System
SBUBandit
May 21, 2012
2
3
Replies
90
Views
40K
Feb 20, 2022
Mooseman
Tune questions....
littleblazer
Aug 26, 2014
2
3
Replies
91
Views
5K
Oct 31, 2014
Purefection
4.2 Engine Rebuild
m.mcmillen
Sep 10, 2016
2
3
Replies
91
Views
44K
Dec 26, 2023
mrrsm
Idling Rough Lately
DenaliHD66
Jan 9, 2013
2
3
Replies
94
Views
6K
Apr 14, 2013
DenaliHD66
4200 Turbo Supra
limequat
May 27, 2012
2
3
Replies
94
Views
17K
Jan 14, 2019
limequat
Locked
<FIXED> Lifter noise & dull knocking (bottom end?) troubleshooting
Capote
May 28, 2016
2
3
Replies
97
Views
31K
Sep 26, 2016
Capote
Synthetic oil question and oil change intervals?
Darkrider_LS
Jul 7, 2013
2
3
Replies
104
Views
8K
May 19, 2014
bspurloc
B
Abandoned, 2007 Envoy 4.2 Turbo Build
Traz
Jan 29, 2018
2
3
Replies
105
Views
12K
Feb 19, 2019
Sparky
Supersparkz
07Blazerman
Dec 9, 2011
2
3
Replies
106
Views
22K
Feb 7, 2019
Blckshdw
W
Reduced engine power light outta nowhere
Whoy
Apr 27, 2014
2
3
Replies
110
Views
14K
Jan 9, 2016
Midnyteryder196
Help to identify top end noise
gmcman
Mar 7, 2019
2
3
Replies
117
Views
14K
Dec 5, 2021
mrrsm
My "cursed" engine rebuild
Bondo07
Mar 6, 2017
2
3
Replies
117
Views
14K
Nov 25, 2018
m.mcmillen
C
Head removal
Catriderf7
Sep 16, 2014
2
3
Replies
118
Views
8K
Apr 23, 2015
Mooseman
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