2001 GTX RFI compression question

[rkkoeb]

So I just picked up two extremely nice 2001 GTX that I am going to fix/clean up and eventually flip. One the first machine I did a compression test and the once cylinder is dead on 150 PSI. When I did the second cylinder it is showing around 200 PSI and I ran the test several times. What is causing this one side to be such high compression? The machine does run.

 

[burtshaver2021]

Excessive oil from leaking inner seal maybe. Take it on a good run and test again

 

[burtshaver2021]

Or worse, oil from fogging spray making both readings higher, I’ve seen that before

 

[Grim]

With Burt's idea you could take the plugs out ,ground the wires and turn it over a couple times to see if any oil/junk comes out. if so , do it a few times to clear it out and then repeat the test.