2009 Chevy Trailblazer 4.2L L6 is clunking at 2000 rpm. The noise gets softer not louder at 30mph when I press the gas. Oil pressure stays steady at mid-range. I changed the oil and filter. Hoping its loose torque converter or something, and not rod.

Can you guys steer me right? Thanks.

Here is the video
DMVB5Md2vpM_Brio5g8q https://www.youtube.com/watch?v=Lo0wGcZvdew




I hate to say it, but that surely sounds like a rod knock to me. It's hard to say 100% that's what it is (diagnosing over the internet being what it is), but two things are telling me this:

First, when you first started the TB, you could hear the knock until the oil pressure caught up. That low pitched sound at first start up is never a good thing and stands out as an issue.

Second, the low pitched sound continues when you rev up the engine. It sounds like someone is hitting the block with a sledge hammer, putting it right in the ball park of a rod knock.

This is not going to get better on its own. You are either looking at a rebuild or a replacement.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.