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Forums
TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
Repairs, tuning, modifications, & maintenance.
Vortec 4.2L I-6
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2.5K
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OEM Thermostat Temperature
Yesterday at 8:07 PM
Mike534x
Drivetrain
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1.1K
13.3K
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13.3K
NEED HELP
Tranny slipping and surging. 4WD switch flashing
Apr 4, 2024
filthyfingers
Vortec 5.3L V8
392
5.2K
Threads
392
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5.2K
Catalytic converter replacement options EPA vs carb
Feb 18, 2024
Mike534x
LS2 6.0L V8
40
839
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40
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839
H
Cylinder 6 Misfire Mystery
Nov 20, 2023
highlander
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Built 4l60e Replacement?
DenaliHD66
Sep 10, 2012
Replies
37
Views
6K
Nov 4, 2013
Sparky
S
I may have ruined the oil pump?
Sprung Monkey
Jun 25, 2021
Replies
36
Views
4K
Jul 28, 2021
Sprung Monkey
S
SOLVED!
Ringing whistle? HVAC disruption during servicing? Or?
Elizabetty
Dec 6, 2022
Replies
36
Views
2K
Jan 10, 2023
Mooseman
5
Ready to just drive it till it dies...
513lette
Apr 9, 2019
Replies
36
Views
5K
Apr 22, 2019
HARDTRAILZ
P
Need Help with 2006 Trailblazer!!!
Peggy
May 15, 2013
Replies
35
Views
3K
May 19, 2013
Phantom
R
Oxygen sensor
Razorback
Jun 20, 2012
Replies
35
Views
5K
Jun 21, 2012
Fire06
F
C
Have to change my battery...dont wanna f*** my car up. HELP needed quick
CReynoldsMIZ
Dec 11, 2012
Replies
35
Views
3K
Dec 13, 2012
The_Roadie
Transmission line uncoupled
coolride
Aug 29, 2019
Replies
35
Views
2K
Sep 8, 2019
coolride
0
04 Chevy Trailblazer
04TBowner
Oct 16, 2014
Replies
34
Views
2K
Oct 26, 2014
04TBowner
0
S
No start no crank
Sscrash
Dec 24, 2019
Replies
34
Views
2K
Dec 27, 2019
Mooseman
S
Poor gas mileage and Poor power
scottrgeorge
Sep 3, 2014
Replies
33
Views
5K
Oct 14, 2014
gmcman
N
2004 TB, hard shift into 4th
NJTB
Nov 19, 2021
Replies
33
Views
3K
Jun 5, 2022
59840Surfer
K
wheel bearing noise
kenzoil
Mar 21, 2014
Replies
33
Views
3K
Apr 16, 2014
kickass audio
K
G
removal and adjustment ParkNeutralPosition safety switch
greggraves
Mar 30, 2014
Replies
33
Views
8K
Jul 5, 2014
Saul
S
J
4.2 Head Gasket?
Justin_kyllo
Feb 19, 2014
Replies
33
Views
7K
Mar 28, 2014
0u812
0
M
Something bad happened - Sunshell?
MichEnvoyGuy
Oct 6, 2013
Replies
33
Views
13K
Nov 5, 2013
triz
R
Synthetic oil
roamingphantom
Apr 11, 2012
Replies
32
Views
3K
Apr 30, 2012
03envoy
B
Transmission Line leak at the wheel well head clamp... temporary fix?
budwich
Dec 18, 2020
Replies
32
Views
2K
May 7, 2021
budwich
B
Whine/Squeal consistent with RPM change (Revisited thread see last post)
PProph
Feb 13, 2012
Replies
32
Views
4K
Jun 14, 2016
PProph
R
Cleaned throttle body - Still misfire (p0300 P0301)
richphotos
Jan 5, 2021
Replies
32
Views
5K
Jan 16, 2021
richphotos
R
Fan clutch and water pump cause- what are your thoughts?
Realism
Mar 14, 2017
Replies
32
Views
2K
Jun 14, 2017
Realism
G
04 TB EXT 4x4 problem. Same problem, but a couple other questions
glock35ipsc
Jan 24, 2014
Replies
31
Views
2K
Feb 1, 2014
freek245
F
Torque converter issue, maybe?
pjrocco
Jan 23, 2017
Replies
31
Views
5K
Mar 27, 2017
Mooseman
K
2002 envoy front def issue
Kr.jr270
Sep 8, 2019
Replies
30
Views
3K
Oct 12, 2019
paul2005tb
T
Temp Transmission Cooler Line Question
tak13
Feb 4, 2020
Replies
30
Views
3K
Aug 10, 2021
matermark
D
Head gasket replacement? Oil in coolant...
deagle12
Sep 4, 2018
Replies
30
Views
3K
Sep 27, 2018
JayArr
Please help! After replacing therm, truck starts, then dies and wont start!?
MedicatedMike
Mar 1, 2012
Replies
30
Views
3K
Mar 26, 2012
joe mama
J
D
Regular or synthetic oil what do you guys think
dazingla
Jul 25, 2013
Replies
30
Views
7K
Aug 15, 2013
HARDTRAILZ
R
NEED HELP
06 Trailblazer EXT 4.2 Engine swap
Rick
Nov 8, 2021
Replies
30
Views
4K
Jan 10, 2022
NJTB
N
Upgrading to 4.10's
Pittdawg
Dec 18, 2011
Replies
29
Views
3K
Sep 14, 2012
Sparky
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