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  1. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    Hello all, I have a 2004 Envoy with about 150,000 miles and it is making this knocking noise from the engine. I have taken the belt off and none of the pulleys are bad. It has been making the noise for years now and it doesn't effect how the truck drives. below is a video of the noise.
  2. OEM Issues
    So I have my 5.3l 04 trailblazer throwing codes for the tps and knock sensor. Codes p0120 p0220 and p0332. First 2 are tps sensors a and b. Last code is knock sensor bank 2. Any suggestions before I tear both off and replace them. If not any tips on replacing them??
  3. TrailBlazer / Envoy Chat
    Hello all, i have a 3" Front and 2" rear lift. I added Tahoe springs and shocks last night. The Tahoe spring was about 1.25" taller than Envoy stock. The shocks were the same compressed and uncompressed lengths. I had to remove my rear 2" spacer as the height added by the new springs...
  4. Engine Tunes/Mods
    A month ago Ive got headers install which was great btw, everything seemed fine except getting the engine code P0420 which was the high flow cats. I got it removed from the tune but the light still pops out. But that's not the problem. A month later Im starting to hear knocking noise for the...
  5. OEM Issues
    I havent had many problems with the denali, except for the bad rod bearings and crankshaft. ouch!! I could hear a engine tap right b4 shifts, or if i would rev engine in park. I immediatlly got sick in the stomach. jk.It only has 66k, thought these engines were bulletproof??B4 I panacked I...
  6. OEM Issues
    I'm new to this so bare with me. I have a 2003 GMC Envoy sitting at approx. 96,000 miles, when I bought it in August last year it had 92,000. When we got it, it had a slight knocking in the motor, mainly when it was idling. Almost sounded more like a tap so I decided it needed better oil and...
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