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Forums
TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
Vortec 4.2L I-6
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4.2L (LL8) DTC Engine Diagnostic Parameters
Mooseman
Oct 7, 2019
Replies
3
Views
6K
Oct 7, 2019
TJBaker57
Locked
Sticky
FAQ: Vortec 4.2L I-6
Mooseman
May 1, 2017
Replies
1
Views
16K
Nov 13, 2020
Mooseman
Normal threads
4.2 Envoy Turbo Build
ConeKilrAutoX
Jul 17, 2012
13
14
15
16
17
Replies
663
Views
57K
Dec 18, 2013
ConeKilrAutoX
Only getting 160 miles on 25gal tank
pcharm129
May 8, 2015
8
9
10
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12
Replies
471
Views
32K
Aug 3, 2016
pcharm129
horrible mpg and weird idle drop
Gerbil21
Aug 11, 2014
4
5
6
7
8
Replies
294
Views
23K
Jan 24, 2016
Gerbil21
D
Cranks but won't start
Dave347
Feb 18, 2014
3
4
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6
7
Replies
265
Views
38K
Jun 15, 2021
Mooseman
U
Transmission removal inspection repair install
Uncleenvoy
Aug 23, 2020
2
3
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5
6
Replies
229
Views
12K
Oct 18, 2020
Uncleenvoy
U
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
Locked
Back to bad MPG heat range causing it?
AzTruckGuy
Jul 11, 2016
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3
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5
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183
Views
17K
Dec 20, 2017
Sparky
U
Power steering line removal and replace
Uncleenvoy
Oct 22, 2020
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3
4
5
Replies
166
Views
12K
Oct 10, 2021
coolride
U
Engine no acceleration
Uncleenvoy
Nov 8, 2020
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3
4
5
Replies
164
Views
10K
Dec 3, 2020
Uncleenvoy
U
NEED HELP
2002 Chevy Trailblazer no crank
BlueDazing
Mar 22, 2023
2
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4
Replies
158
Views
7K
Oct 27, 2023
TJBaker57
C
SOLVED!
Fuse 28 PCM-1 blows randomly
c good
Mar 15, 2018
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4
Replies
156
Views
20K
Oct 5, 2022
rolo95
Locked
Let the fun begin...pulled the head on my 4.2L
midnightbluS10
Feb 18, 2017
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4
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135
Views
20K
Jul 20, 2018
Mooseman
G
04 TB temperature needle drifts to the right when going up a hill
gica
Jul 26, 2019
2
3
4
Replies
125
Views
10K
May 24, 2021
Mooseman
C
Head removal
Catriderf7
Sep 16, 2014
2
3
Replies
118
Views
8K
Apr 23, 2015
Mooseman
Help to identify top end noise
gmcman
Mar 7, 2019
2
3
Replies
117
Views
13K
Dec 5, 2021
mrrsm
My "cursed" engine rebuild
Bondo07
Mar 6, 2017
2
3
Replies
117
Views
14K
Nov 25, 2018
m.mcmillen
W
Reduced engine power light outta nowhere
Whoy
Apr 27, 2014
2
3
Replies
110
Views
13K
Jan 9, 2016
Midnyteryder196
Supersparkz
07Blazerman
Dec 9, 2011
2
3
Replies
106
Views
21K
Feb 7, 2019
Blckshdw
Abandoned, 2007 Envoy 4.2 Turbo Build
Traz
Jan 29, 2018
2
3
Replies
105
Views
12K
Feb 19, 2019
Sparky
Synthetic oil question and oil change intervals?
Darkrider_LS
Jul 7, 2013
2
3
Replies
104
Views
8K
May 19, 2014
bspurloc
B
Locked
<FIXED> Lifter noise & dull knocking (bottom end?) troubleshooting
Capote
May 28, 2016
2
3
Replies
97
Views
30K
Sep 26, 2016
Capote
Idling Rough Lately
DenaliHD66
Jan 9, 2013
2
3
Replies
94
Views
6K
Apr 14, 2013
DenaliHD66
4200 Turbo Supra
limequat
May 27, 2012
2
3
Replies
94
Views
17K
Jan 14, 2019
limequat
Tune questions....
littleblazer
Aug 26, 2014
2
3
Replies
91
Views
5K
Oct 31, 2014
Purefection
4.2 Engine Rebuild
m.mcmillen
Sep 10, 2016
2
3
Replies
91
Views
43K
Dec 26, 2023
mrrsm
Removing Secondary Air Injection System
SBUBandit
May 21, 2012
2
3
Replies
90
Views
40K
Feb 20, 2022
Mooseman
S
Pcmforless Avantages
snowyredenvoy
Dec 7, 2011
2
3
Replies
88
Views
9K
Mar 7, 2012
borretje
S
Low oil pressure on DIC, check gauges light and oil pressure gauge is low
Steevo
Jan 10, 2018
2
3
Replies
86
Views
11K
Feb 17, 2018
Steevo
S
Z
NEED HELP
05 Trailblazer Fuel Gauge Problem. Bad PCM?
Zmoney
Jun 4, 2021
2
3
Replies
85
Views
7K
Sep 8, 2021
Mramses
M
Need engine: Pull from PickNPull or Buy already pulled?
limequat
Aug 31, 2018
2
3
Replies
83
Views
14K
Dec 25, 2018
Traz
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