1999 Chevrolet Blazer LT 4WD SUV engine knock from underneath
 

Hi, I am new here and would greatly appreciate some help

Car: 1999 Chevrolet Blazer LT 4WD SUV

Problem: engine knock coming from underneath engine, oil pressure rises as I press on gas (knocking gets louder).

What have I tried: Using stop knock to try to quiet lifters.


I would appreciate any insight I'm leaning towards a bad bearing or lifter due to the previous searches. :icon_attention:

anyone?

Post video please. We can tell which if sound quality is decent. Also sometimes bad bearings can cause lifters to tick by excessive bearing clearance starving a lifter for oil pressure. For example, #1 Main bearing/rod bearing and lifters draw oil from virtually the same place. #1 rod bearing goes out (last to be oiled and thus lowest pressure) and then a #1 lifter starts ticking.

When bearings go out, fine metal particles get into the oil. If you let a sample of old engine oil settle overnight you can see the metal particles as a shiny layer when you pour from one glass container to another.

Bearing knocks can also be diagnosed by inducing a miss into each cylinder, one at a time by pulling a plug wire. When you find the cylinder that quietens when it misses, you have found the one that is knocking.

Good luck