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Forums
TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
Vortec 4.2L I-6
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GMC Envoy 2003 Engine Shake and Rough Idle.
mqayyum
May 15, 2012
Replies
7
Views
43K
May 18, 2012
Cooztwo
C
Rough idle and misfiring, but no codes
Blckshdw
Mar 16, 2012
2
Replies
43
Views
43K
Dec 18, 2014
Dillyo82
4.2 Engine Rebuild
m.mcmillen
Sep 10, 2016
2
3
Replies
91
Views
43K
Dec 26, 2023
mrrsm
Engine light with down arrow
Mrs Homer
Mar 8, 2012
Replies
13
Views
44K
May 14, 2012
sevendj
S
Vibrations when sitting in drive
Aukland
Jan 12, 2012
2
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45
Views
47K
Sep 30, 2016
paulcmartin
F
Envoy with dreaded rough idle, no codes, UPDATE FIXED!
fatbutweak
Jan 27, 2017
Replies
24
Views
48K
Aug 21, 2020
gmcman
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
4.2 to 5.3 Engine Swap Talk
groundshock
Mar 13, 2013
2
Replies
77
Views
55K
Oct 5, 2019
mrrsm
4.2 Envoy Turbo Build
ConeKilrAutoX
Jul 17, 2012
13
14
15
16
17
Replies
663
Views
57K
Dec 18, 2013
ConeKilrAutoX
L
Rpm revving up and down while driving around 50-60mph.
Lacher
Jan 26, 2016
Replies
26
Views
58K
Dec 17, 2017
6716
What size threads or adapter to check oil pressure at sending unit
gmcman
Apr 5, 2014
Replies
20
Views
59K
Jul 22, 2014
limequat
Running rich, negative long term fuel trim
jbacklund
Jan 21, 2013
Replies
11
Views
64K
Jul 9, 2013
jbacklund
Maximizing 4.2 performance
smitty5150
Jan 4, 2012
Replies
28
Views
86K
Jan 26, 2019
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TrailBlazer, Envoy, 9-7x, Ascender, Rainer, & Bravada
Engine & Drivetrain
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