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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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Re-using Torque converters
Tuesday at 10:44 AM
JayArr
Vortec 5.3L V8
New
394
5.2K
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394
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5.2K
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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The fluid purge has started & ended.
movietvet
Jan 15, 2023
Replies
10
Views
776
Jan 16, 2023
movietvet
P
The dreaded Transmission Flush
pgibbzz
Aug 22, 2013
2
Replies
54
Views
13K
Sep 21, 2020
JayArr
That buttery smooth engine after an oil change never lasts
l008com
Nov 4, 2022
Replies
9
Views
1K
Nov 18, 2022
l008com
2
Thanks!
2envoy3
Feb 1, 2012
Replies
2
Views
1K
Feb 1, 2012
Wooluf1952
C
Testing 4WD Actuator/Disconnect?
coh998
Jul 11, 2022
Replies
22
Views
3K
Jul 22, 2022
coh998
C
Test for mis-matched axle ratio
TJBaker57
Jul 24, 2020
Replies
2
Views
655
Jul 27, 2020
TJBaker57
M
Temporary misfire
Machoman
Sep 10, 2020
Replies
14
Views
2K
Dec 18, 2020
joe mama
J
Temperature Sensor?
psa55
Aug 4, 2016
Replies
13
Views
2K
Dec 9, 2016
fletch09
NEED HELP
Temperature hoses???
JK171
Feb 23, 2016
Replies
9
Views
1K
Feb 24, 2016
Mooseman
Temperature gauge not working
SpeedUp
Nov 12, 2018
Replies
7
Views
897
Nov 15, 2018
Matt
T
Temp Transmission Cooler Line Question
tak13
Feb 4, 2020
Replies
30
Views
3K
Aug 10, 2021
matermark
temp raise after 15 min drive with AC on, but go back if i turn off AC
rolo95
Sep 1, 2023
Replies
21
Views
848
Sep 15, 2023
aaserv
TCM LOCATION
John Koda
Jun 21, 2021
Replies
4
Views
5K
Jun 21, 2021
Chickenhawk
TCCM flaky when cold?
Mooseman
Dec 14, 2013
Replies
10
Views
2K
Jan 20, 2014
zamimj222
Z
TCCM and Shift motor issue
Woodsman
May 3, 2014
Replies
8
Views
3K
Jul 2, 2014
Woodsman
R
TCC flutter Advice?
r-charger
Feb 9, 2014
Replies
2
Views
2K
Feb 18, 2014
r-charger
R
Tbss intake injectors and throttle body upgrade then I lost 2nd gear 😔
Yeagamyster04
Feb 10, 2023
Replies
3
Views
534
Feb 11, 2023
Yeagamyster04
TB won't start and am at wits end.
Bishop
May 26, 2014
Replies
7
Views
1K
May 27, 2014
The_Roadie
C
tb idling at 1000rpm
cmatb08
Oct 11, 2012
Replies
8
Views
1K
Oct 12, 2012
CaptainXL
C
NEED HELP
TB EXT dropping out of gear, overheating
Charles Austin Miller
Jul 17, 2017
2
Replies
40
Views
3K
Jul 26, 2017
jsheahawk
B
tach problem
billy6351
Apr 1, 2012
Replies
5
Views
1K
Apr 1, 2012
Ace1875
R
Synthetic oil
roamingphantom
Apr 11, 2012
Replies
32
Views
3K
Apr 30, 2012
03envoy
K
Switching to 4Hi
kmanz1
Jan 1, 2013
Replies
8
Views
1K
Jan 3, 2013
kmanz1
K
G
Supercharger kit?!
GreenMachineTB
Aug 22, 2020
Replies
2
Views
835
Aug 23, 2020
gmcman
B
Supercharged Trailblazer 4200 I6
bruhaba
Apr 23, 2013
2
3
4
5
6
Replies
233
Views
57K
Apr 4, 2017
Nexus1155
N
A
Super or turbo 4200? HORSEPOWER
AaronJefferson
Feb 18, 2017
Replies
7
Views
1K
Feb 21, 2017
Mooseman
Suggestions on my next step (mod)
Canary2323
Jun 13, 2012
Replies
21
Views
2K
Jul 14, 2012
oh05ext
O
E
Sudden Quick Flashing CEL, P0300 code
Envoy10
May 26, 2018
Replies
5
Views
1K
May 27, 2018
Mooseman
B
Sudden Overheating with New Water Pump
Buck36952
Sep 3, 2013
2
Replies
73
Views
5K
Sep 20, 2013
kkoether
B
Stuck in 4LO (4WD service light on and no light on TCCM)
battleborn
Feb 14, 2014
Replies
11
Views
3K
Feb 18, 2014
IllogicTC
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