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2002 - 2009 TrailBlazer/Envoy Tech
02-09 Vortec 4.2L I-6 Engine and Drivetrain
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OEM Issues
Original Equipment Repairs and/or Problems
71.6K
46.9M
18 h ago
71.6K
46.9M
18 h ago
Air Induction
Performance Air Intake/Air Induction Modifications
11.9K
4.7M
15 d ago
11.9K
4.7M
15 d ago
Exhaust Mods
Performance Exhaust Modifications
12.1K
4.5M
23 d ago
12.1K
4.5M
23 d ago
Engine Tunes/Mods
Performance Engine Tuning/Engine Modifications
21.5K
10.5M
20 d ago
21.5K
10.5M
20 d ago
Transmission Mods
Performance Transmission Modifications
8.6K
5.6M
2 mo ago
8.6K
5.6M
2 mo ago
4x4 Drivetrain
4x4 Repairs & Problems
16.3K
10.2M
1 mo ago
16.3K
10.2M
1 mo ago
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Sticky
= = = New threads may not be posted in this catagory, please select a sub-forum = = =
Jman423
Mar 5, 2008
Locked
0
20K
Mar 5, 2008
by
Jman423
HELP!! Rough idle and exceptionally poor mileage
TopJimmy90
6 mo ago
2
25
1K
19 h ago
by
Schurkey
E
Vibration when stopped and in D, smooth in N or P
EnvoyXL_2006
8 d ago
3
175
6 d ago
by
Ravalli Surfer
I
Transmission leaking from bellhousing, what should I do?
Imjustauser
15 d ago
2
26
929
6 d ago
by
Imjustauser
I did a thing...
SR3000
16 d ago
Poll
9
644
7 d ago
by
SR3000
2003 chevy trailblazer 4×4 pulling code p0502
jessebelanger1068
7 d ago
2
130
7 d ago
by
Ravalli Surfer
New radiator came today.
2003evoysle
18 d ago
8
431
8 d ago
by
2003evoysle
2004 transmission in 2005?
LL1492
10 d ago
0
124
10 d ago
by
LL1492
Caution: Purely for entertainment purposes only!
SR3000
15 d ago
Poll
7
518
12 d ago
by
SR3000
Transfer case issues....again.
518js97
14 d ago
4
158
12 d ago
by
EnvoyBoy2004
O
4x4 not working
Ock
3 mo ago
10
514
14 d ago
by
Snicklefritz4
L
2003 Trailblazer 4.2L engine miss - NO CEL Illuminated - HELP
Lou
15 d ago
3
187
14 d ago
by
chem_man
O2 Oxygen Sensor
gpio230
21 d ago
4
349
17 d ago
by
metalmike187
rpm trouble
saiphak
25 d ago
10
413
21 d ago
by
Brad_
M
PRNDL Lever Moves Full Range But does Not Shift out of Park
mfeeney3
29 d ago
4
395
26 d ago
by
tinmanwpk
R
Mystery Plug
Rishae22
1 mo ago
2
550
1 mo ago
by
Ravalli Surfer
Need to change CO2 sensors
Dbwilliams807
1 mo ago
12
718
1 mo ago
by
Dbwilliams807
C
E15 Mistake:serious?
cprodave
1 mo ago
4
212
1 mo ago
by
cprodave
S
2008 Trailblazer - Disconnected wire
Srbscooby
1 mo ago
4
316
1 mo ago
by
Ravalli Surfer
J
Transmission fluid is black with only 100k miles - change or not?
Johny22
Apr 23, 2022
2
29
2K
1 mo ago
by
Ravalli Surfer
V
Alternator refuses to charge battery
VehicularVortex
1 mo ago
1
206
1 mo ago
by
Ravalli Surfer
2003 4x4 LT LL8 I6 w/ 200,000
scottjohnson247
2 mo ago
7
966
1 mo ago
by
Ravalli Surfer
M
Poll ... How many miles do you have on your trailblazer?
mikebuild
Aug 6, 2020
2
3
4
76
13K
2 mo ago
by
Mr. Peabody
S
Spark plug threads stuck in head
sw904
2 mo ago
2
24
1K
2 mo ago
by
Ravalli Surfer
G
P0016 - check engine - Help save my Envoy!
Gipper
2 mo ago
3
334
2 mo ago
by
Dsport5
Extreme negative camber after suspension install
Lemmiwinks
2 mo ago
1
251
2 mo ago
by
Ravalli Surfer
T
*FIXED* P2135
TerryJr.
3 mo ago
2
23
854
2 mo ago
by
Ravalli Surfer
W
05 Trailblazer 4.2 p0340
WindRider
2 mo ago
5
454
2 mo ago
by
chem_man
E
junk trailblazer
elrod309
2 mo ago
2
28
843
2 mo ago
by
elrod309
03 trailblazer LT 4.2 engine running rough
Octavious
2 mo ago
2
21
1K
2 mo ago
by
Schurkey
G
P0172 Couldn't find the answer in a search
Gegendrauss
2 mo ago
8
324
2 mo ago
by
Ravalli Surfer
M
Can someone explain how the engine thermostat works on the I6 ?
Mr. Peabody
2 mo ago
3
301
2 mo ago
by
Mr. Peabody
K
Front end pull to the right when I hit the gas then back to the left `
karayj
3 mo ago
1
217
2 mo ago
by
karayj
W
suspect my bcm has gone bad need assistance to troubleshoot
wes pierce
3 mo ago
2
30
835
2 mo ago
by
wes pierce
P
Ticking/Lawnmower Sound When Accelerating
paul2112
2 mo ago
11
385
2 mo ago
by
Ravalli Surfer
2004 Trailblazer 4200 transmission wont go into 3rd gear even after a known good tranny was put in. Wiring??
VoyBoy919
2 mo ago
6
479
2 mo ago
by
Ravalli Surfer
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02-09 Vortec 4.2L I-6 Engine and Drivetrain
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