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Forums
TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
Vortec 4.2L I-6
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I'm Getting RPM fluctuation at highway speeds maybe TCC Lock-up?
Mike w
Oct 20, 2014
2
Replies
51
Views
4K
Mar 4, 2015
Mike w
C
Bad Thermostat? Radiator heats up along with engine
CaptainXL
Jan 18, 2013
2
Replies
51
Views
6K
Feb 22, 2013
CaptainXL
C
Engine light came on tonight
Ghost
Jul 31, 2014
2
Replies
51
Views
2K
Aug 7, 2014
Ghost
A
power restoration
aboturky839
Jul 31, 2014
2
Replies
51
Views
3K
Aug 6, 2014
aboturky839
A
help!!! tune installed won't start
borretje
Mar 31, 2012
2
Replies
50
Views
4K
Apr 9, 2012
fadyasha
T
Could it be an intake manifold leak?
tdamocles
Feb 5, 2014
2
Replies
50
Views
15K
Jul 14, 2015
TripleBuick
T
misfiring?
yodaddy4200
Apr 5, 2014
2
Replies
49
Views
3K
Jul 20, 2014
ylab
Y
G
The Dreaded P0171
ghost.leader07
Jun 20, 2020
2
Replies
49
Views
7K
Feb 17, 2023
gica
G
02-05 Exhaust Manifold versus 08-09 Exhaust Manifold
redmaro42
Jan 23, 2015
2
Replies
49
Views
5K
Mar 27, 2016
vipergg
V
What is considered a normal idle
jeffro312
Nov 25, 2012
2
Replies
48
Views
3K
Jan 3, 2013
jeffro312
4.2 mysterious knock HELP!
Goodfella
Aug 31, 2018
2
Replies
48
Views
16K
Sep 17, 2018
limequat
E-Fans
HARDTRAILZ
Nov 21, 2011
2
Replies
48
Views
5K
May 10, 2012
sevendj
S
P
P0305 error
PeachesSabrina
Jun 16, 2021
2
Replies
48
Views
6K
Jun 29, 2021
PeachesSabrina
P
Cylinder head repair
steve
Mar 26, 2012
2
Replies
48
Views
8K
Apr 27, 2012
Opeth
04 Rainier Binding/Vibration during slow speed turns
jeffro312
Oct 4, 2012
2
Replies
48
Views
19K
Feb 8, 2013
mrphoenix80
M
MPGs?
groundshock
Mar 21, 2013
2
Replies
48
Views
3K
Apr 3, 2013
meerschm
R
tb has no power when i accelerate
rojas84
Feb 22, 2014
2
Replies
47
Views
4K
Aug 29, 2014
bspurloc
B
What Does Your 4.2 Engine Sound Like?
jeffro312
Jun 19, 2013
2
Replies
47
Views
4K
Jan 30, 2014
IllogicTC
K
07 engine replace after broken rod.. no start
kincadefoster
May 7, 2020
2
Replies
47
Views
4K
Aug 29, 2020
kincadefoster
K
The case of the mysterious misfire...
khill
Jan 7, 2012
2
Replies
47
Views
28K
Aug 7, 2012
fadyasha
C
Running cold?
c0a8l0v6i8n9
Mar 8, 2013
2
Replies
47
Views
3K
May 19, 2013
The_Roadie
SOLVED!
Locked in Park, Won't activate starter (or click)...?
Roamingdoc
Jul 10, 2022
2
Replies
47
Views
4K
Aug 31, 2022
Roamingdoc
Lime-Swap Turbo Up-pipe Prototype Complete
limequat
Dec 22, 2014
2
Replies
46
Views
7K
Feb 15, 2015
limequat
Removing my PCM4Less efan.
Ace1875
Jun 18, 2012
2
Replies
46
Views
10K
Jan 22, 2013
Mypetropig
M
G
Crank, but won't start
Gold6ix_
Feb 5, 2020
2
Replies
46
Views
5K
Feb 15, 2020
mrrsm
RPM's Jump After Cleaning Throttle Body
jason43080
Jun 22, 2012
2
Replies
46
Views
14K
Jul 1, 2012
The_Roadie
Overheating issue...please chime in
zephyr429
Aug 20, 2016
2
Replies
46
Views
4K
Dec 10, 2017
Reprise
W
Grinding Noise - Only Some Times - While Moving Foward at Speed (40mph?) 2004 TB LT 4WD
webdawg
Apr 27, 2015
2
Replies
46
Views
11K
Aug 14, 2016
Mooseman
4.2 oil consumption
Vicompc
Dec 7, 2011
2
Replies
46
Views
31K
Aug 12, 2014
Vicompc
4.2 to 5.3 Swap
Riddlebox0333
Jan 24, 2012
2
Replies
46
Views
13K
Feb 22, 2012
bigytwotone
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Engine & Drivetrain
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