Search
Everywhere
Threads
This forum
Search titles only
By:
Everywhere
Threads
This forum
Search titles only
By:
Forums
Search forums
What's New?
New Posts
Latest activity
Latest activity
Members
Registered members
Current visitors
Site Rules
Cookie Policy
Privacy Policy
Donate
Forums
Log in
Register
Search
Everywhere
Threads
This forum
Search titles only
By:
Everywhere
Threads
This forum
Search titles only
By:
Search forums
Log in
Register
Menu
Install the app
Install
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
Vortec 4.2L I-6
1
2
3
…
Go to page
Go
85
Next
1 of 85
Go to page
Go
Next
Last
Sort by:
Views
Descending
Filters
Show only:
Loading…
Sticky threads
Locked
Sticky
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
Maximizing 4.2 performance
smitty5150
Jan 4, 2012
Replies
28
Views
86K
Jan 26, 2019
Capote
Running rich, negative long term fuel trim
jbacklund
Jan 21, 2013
Replies
11
Views
64K
Jul 9, 2013
jbacklund
What size threads or adapter to check oil pressure at sending unit
gmcman
Apr 5, 2014
Replies
20
Views
59K
Jul 22, 2014
limequat
L
Rpm revving up and down while driving around 50-60mph.
Lacher
Jan 26, 2016
Replies
26
Views
58K
Dec 17, 2017
6716
4.2 Envoy Turbo Build
ConeKilrAutoX
Jul 17, 2012
13
14
15
16
17
Replies
663
Views
57K
Dec 18, 2013
ConeKilrAutoX
4.2 to 5.3 Engine Swap Talk
groundshock
Mar 13, 2013
2
Replies
77
Views
54K
Oct 5, 2019
mrrsm
The $85,000.00 GM 4.2L Engine Repair
mrrsm
Oct 23, 2015
2
3
4
5
Replies
189
Views
50K
Aug 10, 2022
03TrailblazerNut
0
F
Envoy with dreaded rough idle, no codes, UPDATE FIXED!
fatbutweak
Jan 27, 2017
Replies
24
Views
47K
Aug 21, 2020
gmcman
Vibrations when sitting in drive
Aukland
Jan 12, 2012
2
Replies
45
Views
47K
Sep 30, 2016
paulcmartin
Engine light with down arrow
Mrs Homer
Mar 8, 2012
Replies
13
Views
44K
May 14, 2012
sevendj
S
4.2 Engine Rebuild
m.mcmillen
Sep 10, 2016
2
3
Replies
91
Views
43K
Dec 26, 2023
mrrsm
Rough idle and misfiring, but no codes
Blckshdw
Mar 16, 2012
2
Replies
43
Views
43K
Dec 18, 2014
Dillyo82
M
GMC Envoy 2003 Engine Shake and Rough Idle.
mqayyum
May 15, 2012
Replies
7
Views
43K
May 18, 2012
Cooztwo
C
Removing Secondary Air Injection System
SBUBandit
May 21, 2012
2
3
Replies
90
Views
40K
Feb 20, 2022
Mooseman
M
WTF! Both gas tank strap bolt spins.....
moneypit
Nov 18, 2013
Replies
24
Views
40K
Jan 8, 2019
Lrndthehardway
L
D
Valve cover gasket replacement on 4.2L
dmtaurus
Jul 15, 2013
Replies
7
Views
39K
Jul 22, 2014
hotwheeler69
The dreaded P0017 CODE... Help me pleeeease !
LOWCLASS21
Dec 3, 2013
Replies
17
Views
38K
Dec 28, 2013
bobdec
B
D
Cranks but won't start
Dave347
Feb 18, 2014
3
4
5
6
7
Replies
265
Views
38K
Jun 15, 2021
Mooseman
4.2L vacuum line diagram?
David11946
Mar 3, 2013
Replies
9
Views
35K
Jun 29, 2021
TequilaWarrior
T
L
No oil pressure at idle
LawnRanger
Sep 8, 2012
Replies
32
Views
35K
Aug 6, 2018
Mooseman
R
Timing chain tensioner gone bad?
Revans381996
Mar 6, 2014
2
Replies
45
Views
35K
Mar 12, 2014
AbsoluteZero
A
Dreaded knock sound is starting
gmcman
Apr 13, 2014
2
Replies
72
Views
33K
Apr 20, 2015
gmac310
Stabilitrack and stabilitrack service light.
Inert_Static
Nov 30, 2013
Replies
20
Views
33K
Feb 15, 2018
mrrsm
Only getting 160 miles on 25gal tank
pcharm129
May 8, 2015
8
9
10
11
12
Replies
471
Views
32K
Aug 3, 2016
pcharm129
Why you may need to clean a 4.2L I6 Throttle Body
trailblazer075
Dec 17, 2011
2
Replies
41
Views
32K
Oct 1, 2013
bLAzen03
K
yet another lovely 4.2l valve tick
kickass audio
May 21, 2014
2
Replies
56
Views
31K
Jan 11, 2024
mrrsm
4.2 oil consumption
Vicompc
Dec 7, 2011
2
Replies
46
Views
31K
Aug 12, 2014
Vicompc
Locked
<FIXED> Lifter noise & dull knocking (bottom end?) troubleshooting
Capote
May 28, 2016
2
3
Replies
97
Views
30K
Sep 26, 2016
Capote
C
Engine running hot, clutch fan not engaging
cstern71
Jun 22, 2014
Replies
19
Views
29K
Sep 1, 2014
KNBlazer
The case of the mysterious misfire...
khill
Jan 7, 2012
2
Replies
47
Views
28K
Aug 7, 2012
fadyasha
1
2
3
…
Go to page
Go
85
Next
1 of 85
Go to page
Go
Next
Last
You must log in or register to post here.
Forum Statistics
Threads
23,330
Posts
637,974
Members
18,530
Latest member
jvest
Members Online
No members online now.
Share This Page
Share This Page
Share
Facebook
Reddit
Pinterest
Tumblr
WhatsApp
Email
Share
Link
Forums
TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
Top
Bottom