92 TBI Sub... burning oil... compression testing, etc

[shibbershabber]

So, Ive got a 1992 K1500 Suburban 5.7 with 144k

Im getting smoke intermittantly... usually in the morning, but also when Ive been out driving for a while I will see a cloud behind me as I take off from a stop.

I am also around a quart low after about 500 miles.

Havent pulled all of my plugs yet. But the two I got to on lunch today looked normal.

I put a compression gauge on there and got a variety of readings on the same cylinder. Im sure I am doing something incorrectly. I got as low as 90psi and as high as 130psi on the same cylinder within 3 minutes. I got the same on the other cylinder I tested (90/120/90/120) I cant imagine it would vary that much.

What is the proper procedure for testing compression with a gauge?

Also, is there another way to test if my rings are bad, or if it is in the valves?

Thanks!

 

[Blue95]

Have you replaced the PCV valve ever? cleaned the port in the TB?

 

[shibbershabber]

PCV is good, hose is clear all the way into a rebuilt throttle body...

 

[shibbershabber]

I did order a leak down tester so we'll see what that shows

 

[Blue95]

Any leaks from the pan, timing cover, oil filter adapter, oil cooler lines?