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Forums
TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
Repairs, tuning, modifications, & maintenance.
Vortec 4.2L I-6
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PO442
Friday at 11:06 PM
Stuntmanmike1977
Drivetrain
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1.1K
13.3K
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B
Normal Transmission Temperature?
Yesterday at 12:38 PM
Brian K
Vortec 5.3L V8
New
394
5.2K
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394
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M
Runs rough couple miles after starting
Friday at 10:43 AM
MD_Envoy_Driver
LS2 6.0L V8
40
839
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40
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839
H
Cylinder 6 Misfire Mystery
Nov 20, 2023
highlander
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L
Gas smell ONLY in cold weather.. 2002 Envoy 4.2
leinhit
Dec 23, 2012
Replies
7
Views
5K
Dec 28, 2015
Wooluf1952
Voltage drop when I come off the throttle
6716
Feb 24, 2020
Replies
9
Views
5K
Apr 6, 2020
MRB455
4X4 prob and now no forward or reverse...help
duluthsnow
Dec 17, 2013
Replies
10
Views
5K
Feb 22, 2014
The_Roadie
SOLVED: The Case of the Never Ending Misfire
therealsethallen
Dec 7, 2015
Replies
23
Views
5K
Dec 17, 2015
therealsethallen
4wd Axle Disconnect...Replace or Repair
BanditGTP
Mar 16, 2020
Replies
27
Views
5K
Sep 8, 2021
chris68369
C
R
Oxygen sensor
Razorback
Jun 20, 2012
Replies
35
Views
5K
Jun 21, 2012
Fire06
F
D
IS CASE relearn necessary?
dlnelsonroca
Dec 21, 2015
Replies
4
Views
5K
Dec 22, 2015
Mooseman
C
A.C. Delco Foaming Top End Cleaner....
c good
Nov 14, 2021
Replies
9
Views
5K
Nov 17, 2021
mrrsm
Front crankshaft seal leak... Additive?
zaid3ssaf
Sep 12, 2020
Replies
13
Views
5K
Oct 19, 2020
zaid3ssaf
J
15 codes after transfer case fluid change
jhenry999
Jul 5, 2015
Replies
6
Views
5K
Jul 5, 2015
djthumper
S
Intermittant 900 rpm Idle, P0171 Code & Reduced Fuel Mileage
scarecro
Oct 30, 2012
Replies
7
Views
5K
Feb 22, 2014
IllogicTC
Transmission works again after shutting engine off
BanditGTP
Feb 19, 2020
Replies
29
Views
5K
Jun 1, 2020
Mooseman
S
Poor gas mileage and Poor power
scottrgeorge
Sep 3, 2014
Replies
33
Views
5K
Oct 14, 2014
gmcman
Hopefully solved a high negative LTFT at idle
gmcman
Aug 17, 2019
Replies
1
Views
5K
Aug 17, 2019
Reprise
S
Very lean code idling at 900RPM no other drivability issues
Sagarin12
Mar 12, 2014
Replies
16
Views
5K
Mar 15, 2014
BRomanJr
B
S
I’d like to test compression on the 07 5.3 V8
Sprung Monkey
May 17, 2021
Replies
10
Views
5K
May 19, 2021
Sprung Monkey
S
S
SOLVED!
Trans oil cooler line connector issue
S13Hitman
Mar 22, 2020
Replies
16
Views
5K
Mar 6, 2021
matermark
Transmission slip or clunk between first and second
Iahawkeye
Mar 11, 2012
Replies
7
Views
5K
Mar 14, 2012
seanpooh
I
Preferred Transmission Fluid
Instrumental
Apr 6, 2012
Replies
29
Views
5K
Sep 4, 2012
Lima Tango
5
Ready to just drive it till it dies...
513lette
Apr 9, 2019
Replies
36
Views
5K
Apr 22, 2019
HARDTRAILZ
TCM LOCATION
John Koda
Jun 21, 2021
Replies
4
Views
5K
Jun 21, 2021
Chickenhawk
G
400hp at the crank on a 4200
gmc4flash
Nov 19, 2019
Replies
11
Views
5K
Nov 24, 2019
cornchip
D
NEED HELP
Rear Differential identification and possible rebuild!!
darknight76
Aug 16, 2017
Replies
16
Views
5K
Sep 25, 2017
darknight76
D
R
NEED HELP
06 Trailblazer EXT 4.2 Engine swap
Rick
Nov 8, 2021
Replies
30
Views
5K
Jan 10, 2022
NJTB
N
J
Grinding noise when putting transfer case in neutral?
jonb26b
Jan 12, 2015
Replies
2
Views
5K
Jan 13, 2015
marinegrunt
HPTuners trying to reset fuel trims
Shdwdrgn
Apr 5, 2013
Replies
8
Views
4K
Apr 5, 2013
Shdwdrgn
P
2005 GMC Envoy 4wd problem...any help appreciated
pshabou
Jan 2, 2014
Replies
4
Views
4K
Jan 3, 2014
C-ya
New Serp belt, but still getting noise...
Voymom
Feb 9, 2012
2
Replies
41
Views
4K
Feb 16, 2012
Voymom
S
Heater hose connector broken and stuck
S13Hitman
Mar 22, 2020
Replies
4
Views
4K
Mar 23, 2020
S13Hitman
S
M
rpm/voltmeter problem
mrm143
Feb 29, 2012
2
Replies
57
Views
4K
Mar 5, 2012
woody79
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