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Forums
TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
Vortec 4.2L I-6
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FAQ: Vortec 4.2L I-6
Mooseman
May 1, 2017
Replies
1
Views
16K
Nov 13, 2020
Mooseman
Sticky
4.2L (LL8) DTC Engine Diagnostic Parameters
Mooseman
Oct 7, 2019
Replies
3
Views
6K
Oct 7, 2019
TJBaker57
Normal threads
R
`04 Isuzu Ascender 4.2L I-6 Transmission slips out of gear.
red53
Jul 7, 2015
Replies
10
Views
2K
Aug 5, 2015
uncafreddy
U
[Repaired] 4.2 P1271 code Reduced engine power Fan Harness issue with PICS
ace
Sep 2, 2013
Replies
1
Views
6K
Sep 2, 2013
DJones
Locked
[GONE] Compression gauge up for adoption
Mike w
Jul 27, 2014
Replies
5
Views
708
Jul 28, 2014
Mike w
Your take on these noises
07TrailyLS
Oct 18, 2016
Replies
3
Views
983
Oct 18, 2016
Mooseman
T
Yet another P1345...2002 Trailblazer
TailGazer
Jul 19, 2015
Replies
27
Views
15K
Jul 27, 2015
Mooseman
B
Yet another P0442 post...
BaconBandage
Nov 24, 2019
Replies
11
Views
3K
Dec 21, 2019
BaconBandage
B
K
yet another p0128 thread but hopefully with more troubleshooting
kickass audio
Apr 16, 2014
Replies
15
Views
1K
Apr 17, 2014
kickass audio
K
K
yet another lovely 4.2l valve tick
kickass audio
May 21, 2014
2
Replies
56
Views
31K
Jan 11, 2024
mrrsm
G
yes another P0171 and 900 RPM thread that needs your help
gica
Feb 17, 2023
2
Replies
65
Views
3K
Mar 22, 2023
gica
G
3
Yellow wrench and oil can symbol
308sako
Sep 7, 2012
Replies
11
Views
2K
Sep 8, 2012
McGMT
M
F
NEED HELP
WTH is going on?
FBlaze Mechanic
Jul 8, 2018
Replies
7
Views
1K
Jul 9, 2018
Mooseman
M
WTF! Both gas tank strap bolt spins.....
moneypit
Nov 18, 2013
Replies
24
Views
40K
Jan 8, 2019
Lrndthehardway
L
D
Wont start after installing blower motor resistor.
DBill 06 TB LS
Dec 6, 2015
Replies
15
Views
9K
Dec 8, 2015
mrrsm
NEED HELP
Wont start after engine swap
dvs.dave.03ltz
May 16, 2018
2
Replies
56
Views
17K
Oct 3, 2018
dvs.dave.03ltz
J
Won't stay running!
jonakapunkin
Oct 1, 2012
Replies
4
Views
1K
Oct 1, 2012
gmcman
D
Won't start / turn over
Deviation
Feb 27, 2013
Replies
26
Views
3K
Mar 5, 2013
CarbEnvoy
C
8
won't start
85085AZ
Mar 20, 2012
Replies
1
Views
952
Mar 20, 2012
Wyle
K
Won't start
kw1hf
Dec 28, 2021
Replies
12
Views
2K
Jan 7, 2022
mrrsm
J
Won't go over 3K rpm in park
Jerry473
Nov 21, 2015
Replies
6
Views
1K
Nov 21, 2015
littleblazer
Won't crank and no dash
jpleasant
Jan 1, 2015
Replies
8
Views
914
Jan 21, 2015
SmokeyMcBlazer
M
Woke up today & P1345!
MichEnvoyGuy
Feb 19, 2012
2
Replies
67
Views
20K
Mar 6, 2014
IllogicTC
D
NEED HELP
Wiring diagram & pinout chart .
D.L.G.
Mar 11, 2022
Replies
2
Views
4K
Mar 12, 2022
mrrsm
Will not start after throttle body cleaning and wet combustion check
Kernhills
Mar 15, 2016
Replies
10
Views
3K
Mar 18, 2016
mrrsm
O
NEED HELP
Will not go into any gear
Oldschool
May 18, 2020
Replies
8
Views
2K
Jul 11, 2020
Oldschool
O
Will be pulling engine
russ31073
Mar 3, 2015
Replies
4
Views
1K
Apr 7, 2015
seanpooh
Why you may need to clean a 4.2L I6 Throttle Body
trailblazer075
Dec 17, 2011
2
Replies
41
Views
31K
Oct 1, 2013
bLAzen03
Why is it called the throttle body ... and does it do more than control airflow?
6716
Jan 14, 2014
Replies
16
Views
1K
Jan 19, 2014
IllogicTC
Why 13 MPG?
Royalwapiti
Aug 24, 2014
Replies
29
Views
3K
Dec 29, 2014
Royalwapiti
B
Whole car shakes at idle, need help
blackout51
Mar 2, 2013
Replies
12
Views
2K
Mar 4, 2013
blackout51
B
White Goop on Oil Cap
Rogue92
Jan 5, 2016
Replies
33
Views
7K
May 11, 2020
zaid3ssaf
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Engine & Drivetrain
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