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2002 - 2009 TrailBlazer/Envoy Tech
02-09 Vortec 4.2L I-6 Engine and Drivetrain
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OEM Issues
Original Equipment Repairs and/or Problems
72.6K
50.4M
20h ago
72.6K
50.4M
20h ago
Air Induction
Performance Air Intake/Air Induction Modifications
12K
5M
Mar 10, 2024
12K
5M
Mar 10, 2024
Exhaust Mods
Performance Exhaust Modifications
12.1K
4.7M
Feb 7, 2024
12.1K
4.7M
Feb 7, 2024
Engine Tunes/Mods
Performance Engine Tuning/Engine Modifications
21.6K
11.1M
1d ago
21.6K
11.1M
1d ago
Transmission Mods
Performance Transmission Modifications
8.6K
6M
Mar 10, 2024
8.6K
6M
Mar 10, 2024
4x4 Drivetrain
4x4 Repairs & Problems
16.6K
11M
Mar 8, 2024
16.6K
11M
Mar 8, 2024
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= = = New threads may not be posted in this catagory, please select a sub-forum = = =
Jman423
Mar 5, 2008
Locked
0
20K
Mar 5, 2008
by
Jman423
Iridium plugs WOW
2002 TB LS
3d ago
17
210
3h ago
by
2002 TB LS
D
Coolant/trans fluid mixing.
dniksich
2d ago
12
161
11h ago
by
dniksich
B
Attempting to clean out the “PCV System” in my Envoy’s 4.2L
B_H
2d ago
5
142
24h ago
by
chem_man
R
2004 envoy p0171 code with low fuel trims
rcornelius
Mar 11, 2024
22
461
1d ago
by
chem_man
Fan Clutch swapout to Electric Fan
2002TBlzr
Jan 23, 2020
2
39
9K
1d ago
by
snydere3232
G
What does this line do?
gassinenvoy
Nov 26, 2023
26
1K
3d ago
by
metalmike187
Z
2006 4.2: Exhaust pipe diameter
ZombiePotatoSalad
5d ago
0
75
5d ago
by
ZombiePotatoSalad
G
power failure
grysccnt
6d ago
1
77
6d ago
by
Ravalli Surfer
Is this Axle issue of Front Diff?
Gaurav
7d ago
3
147
6d ago
by
Ravalli Surfer
P
Head Gasket Replacement
psu_nuc
Mar 28, 2007
25
29K
Mar 8, 2024
by
Ravalli Surfer
Switching engines
totally.twistedp469
Feb 28, 2024
3
363
Mar 7, 2024
by
lkurek
M
4.2 rebuild
Marvelous99!
Mar 6, 2024
6
399
Mar 6, 2024
by
Ravalli Surfer
K
Thud Noise After Loss of Power
kenzoil
Mar 4, 2024
9
140
Mar 6, 2024
by
chem_man
M
Poll ... How many miles do you have on your trailblazer?
mikebuild
Aug 6, 2020
2
3
89
22K
Mar 3, 2024
by
Ravalli Surfer
Transmission rebuild and swap
Cwarner8996
Jun 29, 2022
7
2K
Mar 2, 2024
by
jakecanipe.1997
B
No overdrive until warmed up
BradCu
Feb 20, 2024
6
234
Feb 26, 2024
by
Ravalli Surfer
R
2004 GMC Envoy XL 4.2L straight, 206K miles
rpstawicki
Feb 19, 2024
3
170
Feb 24, 2024
by
gassinenvoy
fuel pressure regulator vacuum line PART #
2002 TB LS
Feb 22, 2024
6
252
Feb 23, 2024
by
chem_man
B
Rapidly flashing check engine light now 2007 Envoy will crank but not start
Breilly31
Feb 13, 2024
20
825
Feb 22, 2024
by
DDS-029
P
2002 gmc envoy slt 4x4 new power steering pump whine
Placeholders
Feb 21, 2024
8
175
Feb 21, 2024
by
Ravalli Surfer
S
Misfire at Idle, how to proceed
SeaDoo587
Feb 21, 2024
1
260
Feb 21, 2024
by
chem_man
S
Stuck spark plug (again)
sw904
Feb 20, 2024
0
131
Feb 20, 2024
by
sw904
Sensor Assistance Needed, Please 🙏
elguapo
Feb 14, 2024
18
577
Feb 18, 2024
by
chem_man
Need Help ASAP
Jdue1987
Feb 16, 2024
2
142
Feb 17, 2024
by
Ravalli Surfer
B
swapping transmission from 8 cylinder to a 6 cylinder
brandon.ray.stowe.23
Feb 14, 2024
1
104
Feb 14, 2024
by
Ravalli Surfer
C
Serpentine belt problems 07 Trailblazer 4.2 L
CedarHaven
Apr 26, 2021
4
1K
Feb 13, 2024
by
Nickbryan
K
Wife CALLED !!!! car won't go forward till warm up.
karayj
Feb 6, 2024
6
266
Feb 12, 2024
by
Brad_
2005 Trailblazer P0641
Leftyridge84
Jun 16, 2023
13
1K
Feb 11, 2024
by
Leftyridge84
Engine and transmission compatibility
Cwarner8996
May 19, 2022
12
6K
Feb 9, 2024
by
Ravalli Surfer
AC Compressor bypass
Trekie47
Sep 10, 2021
10
7K
Feb 6, 2024
by
chem_man
D
Engine Upgrades 4.2L
donaldduck
Sep 12, 2023
17
3K
Feb 4, 2024
by
Gaurav
2004 GMC Envoy power steering blowout
No Monitor
Jan 13, 2024
9
683
Feb 2, 2024
by
Ravalli Surfer
M
On demand AWD
Masonsiegert
Jan 28, 2024
17
416
Jan 29, 2024
by
Usind1959
M
Engine will not start after motor swap
Michael S.
Jan 13, 2024
3
338
Jan 26, 2024
by
tokanero
C
Turn over, no start
Chris S.
Jan 24, 2024
6
198
Jan 25, 2024
by
TJBaker
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02-09 Vortec 4.2L I-6 Engine and Drivetrain
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