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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
C
Only 3000 miles on oil, but One year old. Change filter too?
c good
Tuesday at 1:24 PM
Replies
6
Views
122
Tuesday at 4:41 PM
Redbeard
R
C
OEM Thermostat Temperature
Camdo
Apr 19, 2024
Replies
10
Views
167
Apr 19, 2024
Mike534x
2002 TB running great
movietvet
Apr 17, 2024
Replies
0
Views
78
Apr 17, 2024
movietvet
O2 Sensor Recommendation please?
jmonica
Mar 10, 2024
Replies
8
Views
334
Mar 16, 2024
jmonica
S
Heat shield
Stuntmanmike1977
Feb 25, 2024
Replies
2
Views
249
Feb 26, 2024
Mooseman
W
4.2 xuv water pump and coolant
WookieeUK
Feb 15, 2024
Replies
7
Views
357
Feb 17, 2024
WookieeUK
W
C
Electric oil pressure gauge or true oil pressure gauge?
c good
Feb 5, 2024
Replies
3
Views
251
Feb 5, 2024
mrrsm
NEED HELP
2002 tb Oil leak spilling in to the belt
rolo95
Jan 22, 2024
Replies
11
Views
585
Jan 30, 2024
Mooseman
C
Interesting 4.2 GM video
c good
Jan 21, 2024
Replies
0
Views
286
Jan 21, 2024
c good
C
T
part number search: rubber plug for flexplate bolt access hole
tcell70
Jan 11, 2024
Replies
2
Views
174
Jan 12, 2024
mrrsm
R
2004 trailblazer no crank no start
Randall350
Jan 4, 2024
Replies
8
Views
557
Jan 16, 2024
Mooseman
An Insurmountable Problem? Or Is There A Novel Way To Restrain The Timing Chain Against The Lower Crankshaft Cog?
mrrsm
Jan 3, 2024
Replies
1
Views
276
Jan 3, 2024
c good
C
J
SOLVED!
Alternator not charging
joe mama
Nov 22, 2023
Replies
3
Views
535
Nov 24, 2023
joe mama
J
B
Lost compression cylinder four
boredwild
Nov 19, 2023
Replies
5
Views
632
Dec 1, 2023
boredwild
B
G
NEED HELP
4.2 cylinder sleeve replacement
Gfmdesign
Nov 12, 2023
2
Replies
40
Views
2K
Mar 19, 2024
mrrsm
FIXED. Random P0300 misfire gremlin
Realism
Nov 7, 2023
Replies
9
Views
630
Nov 8, 2023
Realism
2005 4.2 P0455 Code
Petnatcar
Nov 3, 2023
Replies
13
Views
782
Nov 14, 2023
Petnatcar
P0325 - Which knock sensor is the culprit?
Mike534x
Oct 31, 2023
Replies
25
Views
1K
Nov 18, 2023
Mike534x
NEED HELP
Looking for info on testing COP, good ohm range
Drec
Oct 25, 2023
Replies
1
Views
324
Oct 25, 2023
TJBaker57
Help diagnosing an engine rattle?
Shdwdrgn
Oct 21, 2023
Replies
13
Views
642
Nov 13, 2023
Shdwdrgn
T
NEED HELP
After putting in new rebuild 4.2 Envoy can't get it to start up.
Tboy4u2nv
Oct 20, 2023
Replies
7
Views
568
Oct 24, 2023
azswiss
A
NEED HELP
Clean Throttle & MAF Sensor... Still Rough at Idle...
AC75TB07
Sep 21, 2023
Replies
8
Views
675
Sep 22, 2023
mrrsm
K
Which way do the main bearings go on 4.2?
KWG2005
Sep 6, 2023
Replies
25
Views
1K
Sep 10, 2023
mrrsm
S
2005 TB 4.2L engine noise
santon
Sep 1, 2023
Replies
10
Views
875
Mar 10, 2024
azswiss
SOLVED!
replacement cat
jak03TB
Aug 31, 2023
Replies
20
Views
1K
Nov 8, 2023
Realism
E
2005 Envoy Cranks will not start.
Envoywarrior
Aug 28, 2023
Replies
5
Views
479
Aug 29, 2023
Envoywarrior
E
A
NEED HELP
Belt Tensioner?
AC75TB07
Aug 19, 2023
Replies
14
Views
938
Nov 8, 2023
Realism
A
NEED HELP
Manually Adjust Transfer Case Position?
AC75TB07
Aug 19, 2023
Replies
21
Views
2K
Aug 22, 2023
AC75TB07
A
Weird Cooling problem
JayArr
Aug 18, 2023
Replies
30
Views
1K
Sep 3, 2023
JayArr
P0135
JayArr
Aug 13, 2023
Replies
23
Views
946
Sep 18, 2023
Mooseman
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Engine & Drivetrain
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