What does the tensioner do on a Chevy Trailblazer?

The tensioners job is to keep the right amount of pressure on your Chevy Trailblazer’s timing belt or chain. As the belt/chain stretches through normal operation, it would get loose and fall off or jump. The tensioner keeps this from happening by keeping a consistent amount of force on the belt.

What happens when the timing belt goes bad on a trailblazer?

Noise – A good indication that a timing belt has gone bad is going to be noise. There may be a sound of rubber beating against something. It’ll typically be a rough rattling sound, and it is often most noticeable right when you start up your Trailblazer.

When do I need to replace my tensioner?

If you are going to replace the tensioner, make sure to swap the belt as well. It’s so hard to get to, and timing belts/chains are relatively affordable. It’s just the TIME that it would take you or your mechanic to get to it that’s the problem. Most manufacturers will recommend changing the timing belt at 60k or 100k miles.

What causes a Chevy Trailblazer to not start?

Engine Won’t Start – If your Trailblazer’s timing chain or belt has fallen off completely, broken, or has jumped a few teeth, it is entirely possible that the engine won’t even start. You might hear it slapping around as the engine cranks over. If this is the case, the damage is already done.

When to change timing belt on Chevy Trailblazer?

Conclusion: Chevy Trailblazer Timing Chain Symptoms Most manufacturers will recommend changing the timing belt at 60k or 100k miles. There isn’t usually a service window at all for the chains. Although, it can vary.