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Forums
TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
Vortec 4.2L I-6
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D
PCM Tune = poor gas mileage
DragonTX
Jan 2, 2013
2
Replies
41
Views
6K
Apr 15, 2013
SEMIJim
S
S
Timing chain concern delaying cylinder head repair
selectah77
Feb 22, 2016
2
Replies
41
Views
4K
Aug 2, 2023
mrrsm
Cylinder Head Replacement (Now Total Engine Replacement)
therealsethallen
Mar 14, 2016
2
Replies
40
Views
5K
Apr 18, 2016
therealsethallen
G
NEED HELP
Engine Replaced - Won't Start
Gaffer
Jul 20, 2019
2
Replies
40
Views
9K
Mar 7, 2020
Gaffer
G
G
NEED HELP
4.2 cylinder sleeve replacement
Gfmdesign
Nov 12, 2023
2
Replies
40
Views
2K
Mar 19, 2024
mrrsm
Replacing a bunch of parts
LilMule
Apr 29, 2015
2
Replies
40
Views
2K
May 1, 2015
littleblazer
D
AC blowing hot air after 5 minutes.. :(
Detroit Muscle
Jul 25, 2018
Replies
39
Views
7K
Jul 17, 2019
JerryIrons
J
I can't figure out this sound coming from my engine.
eXplicit
Mar 7, 2014
Replies
39
Views
2K
Mar 17, 2014
eXplicit
'06 4.2L-Filthy oil inside air plenum.
stvrob
Jan 19, 2016
Replies
38
Views
25K
Dec 26, 2021
59840Surfer
N
E-Fan Conversion
novajoe
Sep 11, 2013
Replies
38
Views
11K
Mar 21, 2016
Blckshdw
G
04 Bravada random misfire keeps coming back
gladesteen
Dec 20, 2021
Replies
38
Views
3K
Dec 22, 2021
gladesteen
G
Can I get more power from my 4.2?
JayArr
Aug 27, 2020
Replies
38
Views
5K
Jan 25, 2021
rchalmers3
R
New Oil Capacity
seanpooh
Jan 24, 2012
Replies
38
Views
3K
Apr 26, 2012
seanpooh
F
oil everywhere
firevision
Feb 13, 2014
Replies
38
Views
17K
Feb 26, 2014
AbsoluteZero
A
Engine Stumble at idle.
Alec Venable
Nov 9, 2016
Replies
38
Views
9K
Mar 16, 2017
Realism
J
Tips on 1st Thermostat replacement on Inline-6
jhenry999
Aug 8, 2015
Replies
38
Views
7K
Dec 8, 2018
Stuntmanmike77
S
Engine Tick/Knock 2005 97k Miles
wesman43
Jun 10, 2013
Replies
38
Views
6K
Apr 27, 2014
nagyiii
Changing spark plugs.
LouisTB
Apr 19, 2016
Replies
37
Views
6K
Feb 20, 2022
Brian K
B
S
engine not very responsive 40-50 mph
signalnc
Apr 15, 2013
Replies
37
Views
3K
Apr 19, 2013
gmcman
J
Ready to pull hair out.
jistincase
Aug 20, 2015
Replies
37
Views
4K
Nov 10, 2015
bennys602
B
W
NEED HELP
Vortec 4.2L I-6 2006 Trailblazer 2 Wheel Drive Oil Pan Removal
wes112565
Jan 2, 2017
Replies
37
Views
13K
Feb 13, 2017
wes112565
W
C
i think my cat is nearing its end.
CaptainXL
May 25, 2012
Replies
37
Views
3K
Jun 26, 2012
Menthol
M
B
Jerking when rolling forward in gear
blackout51
Feb 18, 2013
Replies
37
Views
2K
Mar 7, 2013
blackout51
B
Turbo time?
CDJuda
May 5, 2014
Replies
37
Views
7K
Jul 23, 2014
CDJuda
E
2004 Envoy squealing when up to speed, already replaced belt and tensioner
e-iowa-o
Jun 27, 2021
Replies
37
Views
4K
Jan 22, 2023
Billdaman1
B
NEED HELP
Can p0171 be related to sais
jeffro312
Sep 13, 2016
Replies
37
Views
5K
Oct 17, 2016
Mooseman
R
Locked
New Guy on board
rchalmers3
Jul 11, 2020
Replies
36
Views
4K
Jul 29, 2020
Mooseman
Oil Pressure Problems, and Possible Oil Pressure Switch Replacement?
zsiya
Apr 6, 2014
Replies
36
Views
27K
Jun 8, 2014
04TBlazerLS
0
W
ac clutch need replaced?
Whoy
May 19, 2014
Replies
36
Views
3K
Jul 8, 2014
Magyver
fan clutch replacement questions
Tofer76
Dec 13, 2011
Replies
36
Views
3K
Feb 10, 2012
barron03
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TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
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