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Forums
TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
Repairs, tuning, modifications, & maintenance.
Vortec 4.2L I-6
New
2.5K
38.8K
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2.5K
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38.8K
OEM Thermostat Temperature
Friday at 8:07 PM
Mike534x
Drivetrain
New
1.1K
13.3K
Threads
1.1K
Posts
13.3K
NEED HELP
Tranny slipping and surging. 4WD switch flashing
Apr 4, 2024
filthyfingers
Vortec 5.3L V8
New
393
5.2K
Threads
393
Posts
5.2K
Rate this Used Airfilter
Today at 6:57 AM
Ilikemy3s
LS2 6.0L V8
40
839
Threads
40
Posts
839
H
Cylinder 6 Misfire Mystery
Nov 20, 2023
highlander
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4.2L I6 Head Removal/Engine Restoration
OctaneRider03
Aug 1, 2012
9
10
11
12
13
Replies
490
Views
67K
Jan 28, 2013
OctaneRider03
B
Supercharged Trailblazer 4200 I6
bruhaba
Apr 23, 2013
2
3
4
5
6
Replies
233
Views
57K
Apr 4, 2017
Nexus1155
N
Mix dex cool with green antifreeze?
Canary2323
Apr 5, 2013
Replies
19
Views
40K
Apr 7, 2013
gmcman
B
4WD Service Light - C0379 Code
Budmiester
Jan 15, 2012
Replies
10
Views
39K
Apr 14, 2020
MaxiVI
M
Help with code P0410 on a 2005 trailblazer
Malo
Jan 17, 2014
Replies
12
Views
38K
Feb 26, 2016
Mooseman
2
SOLVED!
Higher LTFT at idle and higher at rpms
2001ZR2
Aug 7, 2019
2
Replies
76
Views
34K
Aug 20, 2019
mrrsm
2003 Envoy SLT I6 4.2 - Transmission Fluid & Filter Change
PBoneBallSack
Mar 8, 2012
Replies
13
Views
34K
Mar 19, 2012
playstrings
P
S
Code p0756 loss of power in first I changed shift solenoids no change. need advise.
sniderjr1
Nov 9, 2012
Replies
16
Views
33K
Feb 1, 2019
Reprise
ENGINE SWAP: 2004 for 2002 GM ATLAS 4.2L MOTOR
mrrsm
Jul 11, 2016
2
3
4
5
Replies
168
Views
31K
Feb 3, 2023
mrrsm
C
2006 trailblazer removing engine-getting to transmission housing bolts?
CASHKJ
Feb 28, 2013
Replies
8
Views
30K
Mar 3, 2013
dfc739
Rough idle and knocking noise from bottom of motor
holytornado84
Oct 12, 2016
2
3
4
5
Replies
196
Views
29K
Mar 21, 2017
holytornado84
Replacing Crankshaft Front Seal [SOLVED]
Ric_Whit
Oct 18, 2017
2
3
Replies
106
Views
28K
Mar 28, 2023
richphotos
R
Transmission fluid into oil to clean lifters and stopping the knock?
WeaponX
Nov 14, 2019
Replies
10
Views
27K
Nov 16, 2019
littleblazer
M
P1482 Code- AFTER replacing Clutch fan
Mike
Apr 8, 2012
Replies
10
Views
25K
Nov 10, 2021
filthyfingers
2
2003 trailblazer ext wont move when engaged in drive or reverse
2003trailext
Feb 3, 2014
Replies
10
Views
25K
Jun 22, 2016
mrrsm
S
Spark plug torque
slamfire
May 8, 2013
Replies
20
Views
25K
May 9, 2013
seanpooh
J
Scraping/grinding front differential noise
jmac219
Mar 11, 2018
Replies
7
Views
23K
Mar 16, 2018
Mooseman
R
Thoughts on Lucas transmission stop slip?
Revans381996
May 9, 2014
Replies
10
Views
21K
May 14, 2014
DocBrown
G
SOLVED!
Cranks but won't start after driving.
GBOfan
Apr 30, 2019
2
Replies
64
Views
21K
Nov 1, 2019
GBOfan
G
D
Vibration / shake when shutting off... WTF?
db131994
Nov 6, 2014
Replies
17
Views
20K
Dec 8, 2017
AzTruckGuy
SOLVED!
Grinding in the front right.
coolride
Dec 10, 2019
2
3
4
Replies
125
Views
20K
Feb 24, 2020
coolride
Z
4.2 vs 5.3...hear me out.
ZR2Trailblazer
Apr 28, 2012
2
Replies
72
Views
20K
Jun 24, 2012
ZR2Trailblazer
Z
S
Flickering Head lights and dome lights with engine running
sylvezter
Dec 21, 2011
Replies
11
Views
20K
May 16, 2018
georgel
G
C
Replacing transmission lines
Chi06SRGTO
Jun 1, 2014
Replies
10
Views
19K
Jun 5, 2014
JerryIrons
J
H
NEED HELP
Trailblazer Overheating / Coolant
Hoop1101
Nov 21, 2016
Replies
19
Views
18K
Dec 12, 2016
mrrsm
NEED HELP
DEXRON VI Mixed with Nasty Old DEXRON III?
SLiNv_Vic
Apr 10, 2016
Replies
15
Views
17K
Jun 21, 2016
mrrsm
NEED HELP
Flex plate cracked: do I need to pull transmission?
HizAndHerz
Apr 14, 2017
2
Replies
51
Views
15K
Jun 24, 2017
HizAndHerz
Coolant burning/boiling type smell, everyone once in a while.
06TrailblazerLSS
Aug 7, 2014
2
Replies
53
Views
15K
Jun 8, 2015
C-ya
gas smell
gkrenzer
Aug 22, 2012
Replies
18
Views
15K
Mar 7, 2014
Matt
J
Metal on metal grinding noise, louder on right curve/turn
jemmie
Jul 1, 2012
Replies
26
Views
15K
Jul 8, 2012
jemmie
J
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