compression test

you can do it ether way. Hot or cold. Pull all the plugs.
Put the tester on each hole. Crank the engine over 4 times.
See what the compression is and go to the next hole. Do this
till you have all the cylinders covered. Then if compression is
low. Do it again on each cylinder with a couple squirts of oil.
If it come up then you got bad rings. Good luck, Green Duster.