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timing chain
1-9 of 9 Results
  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
    Good Evening, I'm new here and new to Trailblazers. I recently purchased a 2006 Trailblazer LT 4.2L with 127k miles it. It came with a laundry list of problems. I've managed to fix all of them except the P0017 code and what sounds like a timing chain rattle. The code is persistent but the rattle...
  3. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    2003 TB 4.2L I6, 190K miles. At idle, using a stethoscope, my deep rattling noise is loudest from the timing chain cover. All accessories and idlers have their unique "normal" sounds, each with a hint of the same sound in the background. It's also quite audible in the engine compartment...
  4. The 02-09 "How-To" and DIY Section
    I feel stupid asking this, I need to know the easiest way to get the timing chain guide screw. I took on the task of changing the head gasket on my 2004 Chevy Trailblazer V6 4.5L. I'm down to this last bolt and we will be able to get to the gasket. I say we because I have to get my brother to...
  5. 02-09 General Tech Q&A
    My trailblazer makes a loud rattling noise that sounds like a dancing gear or a dancing belt hitting something/rubbing on something. It's coming from the very front of the valve cover, the truck runs fine and doesn't have any issues, it just makes a concerning noise. Note: I'm running it with...
  6. OEM Issues
    alrighty so, I have myself a 2006 trailblazer. going in for inspection, it has a code P0017 for crankshaft position. the cam actuator, cam position sensor, and crankshaft position sensor were all replaced, but to no avail. then after some googling, people were saying the timing chain could have...
  7. Engine Tunes/Mods
    Alright, so I have a trailblazer engine I bought with 99k miles on it because I gave up repairing my trailblazer engine, I have the engine out and I have a new timing chain and oil pump, should I change them before I put the new engine in or should I just drop the engine in?
  8. General
    Hey all, The timing chain snapped on my 2003 envoy and cracked a cylinder. It will be missed. I will be trading it in for a 2004 subaru wrx sti. Thanks for all the help! :thx
  9. OEM Issues
    I just purchased a 2004 Trailblazer LS 4x4 with 88K miles. No sooner than I got it home, I noticed a rattle in the engine compartment. It seems to be at it's worse when the A/C is on. After inspection, I was sure it was the tensioner pulley on the passenger side of the motor because that is...
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