HotDC5

I might be buying a used car and I want to get the motor compression tested to make sure its straight? Any shops do this and if so which ones?

Ick

I'm sure any shop could do it. It takes about 10 minutes(not including warm-up time).

HotDC5

can inlinepro compression test a motor already in a car? anyone know?

deeseetoo

you could compression test it yourself if you could get to the spark plugs. I think you have the wrong idea of what compression testing is

DragII

it takes about 10 minutes and basic hand tools to do a compression test.

90tegLS703

go to advance and buy the compression tester, it's like $40 even better yet get a leak down test on the motor.

HotDC5

Do I go to a shop for the leak down test or just buy a tool for that, whats the difference between the two?

HORNY4ZORNY

yeah man get the tester and do it your self

1max2nv

Compression test....you crank the motor with a pressure gauge in the spark plug hole.

Leakdown test....you pressurize the combustion with compressed air via the spark plug. You do this with all the valves closed. Measure how much pressure you loose after certain period of time.

If you don't know how to do it or what the factory spec is for the car. You are better off taking it to a shop.

HotDC5

thanks for the replies