Low oil pressure, knocking, stalling
So I have an '06 Chevy Trailblazer. It's V6 4.2 Liter.
Plugs, wires and air filter changed every oil
change. Recently we took a trip, was going about
80 on the interstate. It was fine getting there
however upon heading home and accelerating
back onto the interstate oil pressure dropped
suddenly, light came on as well as one telling us to
turn off the engine. We did so, let it sit for about
15 minutes, it started again. However every time
we slowed or came to a stop we had to turn it off
again and let it sit for about 10-15 minutes.
We got it to a friend's checked the oil, it was low
but there wasn't any leaking. Changed the oil and
oil filter but noticed a very noticeable knocking
sound and every time we went to accelerate the
vehicle would start acting like it wanted to stall.
It's now sat in our drive way for about 2 months. It
fires up just fine and idles great for about 15
minutes but upon stepping on the gas or revving
the engine it begins acting like it wants to stall.
The knock is still there.
I need opinions, I've had a few friends and
mechanics saw it needs lower engine work and
I've had a few friends and mechanics saw its a
A clogged exhaust won't cause engine knock. I suspect that the oil loss, or loss of oil pressure you experienced damaged rod & main bearings. You could just get a short block or you might be able to rebuild yours. The truck's new enough that there's value in whichever you choose.