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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
38.9K
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2.5K
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38.9K
Horn dose not work
Yesterday at 4:47 PM
Sqrly
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
Tuesday at 12:20 PM
christo829
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
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
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
4.2 keeps losing oil pressure
chuey_316
Feb 4, 2021
2
3
4
Replies
133
Views
13K
Jul 18, 2021
chuey_316
C
SOLVED!
Grinding in the front right.
coolride
Dec 10, 2019
2
3
4
Replies
125
Views
20K
Feb 24, 2020
coolride
NEED HELP
P0171 on my 04 Trailblazer LT won't go away
ghost_leader07
Sep 24, 2021
2
3
Replies
117
Views
8K
Nov 6, 2023
mrrsm
SOMETHING Just blew...
DenaliHD66
Jun 24, 2013
2
3
Replies
116
Views
7K
Aug 19, 2013
DenaliHD66
Replacing Crankshaft Front Seal [SOLVED]
Ric_Whit
Oct 18, 2017
2
3
Replies
106
Views
28K
Mar 28, 2023
richphotos
R
MPG.. OUCH!
Gump2773
Feb 22, 2012
2
3
Replies
100
Views
8K
Mar 28, 2012
tcjack
T
T
Locked
SOLVED!
Cylinder Head and timing chain headaches.
tucker12
May 20, 2020
2
3
Replies
96
Views
13K
Aug 13, 2021
Mooseman
M
PCMforless Tax Time Sale!!!
marshall@pcm
Feb 9, 2012
2
3
Replies
94
Views
8K
Apr 7, 2012
Ace1875
Is this the end?
Hatchet
Aug 18, 2013
2
3
Replies
92
Views
7K
May 27, 2014
nagyiii
Power choking
PProph
Apr 2, 2014
2
3
Replies
86
Views
7K
Aug 4, 2015
yonkster4g4
S
Engine swap for 07 saab97x 5.3i need advice on used engine please
Sprung Monkey
Oct 4, 2021
2
3
Replies
86
Views
8K
Aug 15, 2022
TollKeeper
J
06 TB 4.2 stalling while braking..
jeffrobinson
Mar 31, 2014
2
3
Replies
85
Views
6K
Oct 24, 2014
jeffrobinson
J
B
No crank no start isn't it lovely
bennieRohde
Oct 24, 2023
2
3
Replies
83
Views
2K
Nov 10, 2023
bennieRohde
B
My efan setup (Montana/Venture efans)
Mooseman
Mar 19, 2012
2
Replies
79
Views
11K
Mar 3, 2014
Sparky
Throttle body or positioning sensor?
WeaponX
Sep 22, 2019
2
Replies
77
Views
6K
Oct 13, 2019
WeaponX
02 I6 no start help
danger
Apr 6, 2014
2
Replies
76
Views
4K
Apr 27, 2014
IllogicTC
SOLVED!
Intermittent stops cranking during start attempt
movietvet
Mar 19, 2023
2
Replies
76
Views
3K
May 23, 2023
movietvet
2
SOLVED!
Higher LTFT at idle and higher at rpms
2001ZR2
Aug 7, 2019
2
Replies
76
Views
35K
Aug 20, 2019
mrrsm
N
Novice Attempting TC & Disconnect Service, Help?
NotAMechanic
Nov 1, 2018
2
Replies
76
Views
8K
Jan 3, 2022
NotAMechanic
N
B
Sudden Overheating with New Water Pump
Buck36952
Sep 3, 2013
2
Replies
73
Views
5K
Sep 20, 2013
kkoether
Z
4.2 vs 5.3...hear me out.
ZR2Trailblazer
Apr 28, 2012
2
Replies
72
Views
20K
Jun 24, 2012
ZR2Trailblazer
Z
Wheel bearing hub assembly
Dmflash
Mar 8, 2023
2
Replies
68
Views
4K
Nov 28, 2023
far eastan
F
Why change synthetic oil every 3,000 miles?
C-ya
Nov 1, 2012
2
Replies
64
Views
6K
Feb 14, 2013
Sparky
G
SOLVED!
Cranks but won't start after driving.
GBOfan
Apr 30, 2019
2
Replies
64
Views
21K
Nov 1, 2019
GBOfan
G
S
Cruising good only about 1.5 miles then she cuts off.
Sprung Monkey
Apr 14, 2021
2
Replies
59
Views
5K
Oct 17, 2021
Martyelzz4
M
Oil Pressure Gage
Mektek
Jul 1, 2019
2
Replies
59
Views
10K
Sep 3, 2021
gmcman
1
2
3
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