02-09 Vortec 4.2L I-6 Engine and Drivetrain | Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

OEM Issues

Original Equipment Repairs and/or Problems

70.9K

45.5M

9 h ago

70.9K

45.5M

9 h ago

Air Induction

Performance Air Intake/Air Induction Modifications

11.9K

4.6M

6 d ago

11.9K

4.6M

6 d ago

Exhaust Mods

Performance Exhaust Modifications

12K

4.3M

2 mo ago

12K

4.3M

2 mo ago

Engine Tunes/Mods

Performance Engine Tuning/Engine Modifications

21.4K

10.2M

2 d ago

21.4K

10.2M

2 d ago

Transmission Mods

Performance Transmission Modifications

8.5K

5.5M

13 d ago

8.5K

5.5M

13 d ago

4x4 Drivetrain

4x4 Repairs & Problems

16K

9.8M

13 d ago

16K

9.8M

13 d ago

Sticky = = = New threads may not be posted in this catagory, please select a sub-forum = = =

0

20K

P0128 - Thermostat or sensor?

3

112

Oil consumption

12

158

by Ravalli Surfer

Knocking noise coming from engine

2

29

5K

by Ravalli Surfer

Rebuilt Transmission problems.

2

21

363

Engine oil drain plug leak

19

130

by MoneyMayo_TB

Transmission fluid leak

Ock
8 d ago

7

102

by Ock

Vibration or resonance before downshift

2

20

231

by Ravalli Surfer

Fan Clutch swapout to Electric Fan

2

32

3K

02 envoy throttle position sensor part number

2

100

Back In Limp Mode Again

10

271

Roaring sound ? On take off.

17

452

Vibration at idle, in or out of park

18

440

Transmission fluid is black with only 100k miles - change or not?

2

25

1K

by Ravalli Surfer

Engine Swapping Thoughts

4

201

by sKaTersensei

Envoy makes loud whine noise

17

453

HELP! My 03 Envoy is mad at me

14

920

1

172

by metalmike187

4.2 I6 Backfire and Random Misfire Issues

6

372

by wheresthepeanutbutter

4wd switch acting funny after accuator replacement

1

166

Should I replace or repair?

6

275

by GA Rob

2005 Trailblazer: After fixing long term P0017 code, now have P0171 code with a twist.

16

782

Had Axle Seal Fixed But Something Is Leaking Again. Help!

13

465

08 4.2 trailblazer lt cam position sensor

2

26

610

Using the Memory Saver

2

28

994

by Ravalli Surfer

02 envoy 2 new throttle bodies still P1221

16

411

2

194

Radiator stack/ sequence and fluctuating coolant temp

Ock
4 mo ago

5

327

by Ravalli Surfer

Leaking transmission line

4

181

08 GMC Envoy - Reduced Engine Power, Bogging, Misfire, Dead Spot in Throttle

11

708

P0016 Code for 2004 Trailblazer LT

3

282

Leaving oil pressure switch disconnected?

10

326

by metalmike187

2005 envoy 4.2 cylinder 2 misfire

9

385

by Joe_67

Operating Temperature

11

494

Hoo dat nockin my doe?

3

194

by Joe_67

Rough idle when foot is on brake, also feel a "miss" at times while driving.

15

490

by Joe_67