Thread: Whats it worth?
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Old 08-23-2016, 11:37 AM   #44
Croustibat
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Quote:
Originally Posted by 240si View Post
how would i go about getting a compression check done?
Buy a compression tester, remove fuel pump fuse, try to start the car until the engine stops by being out of fuel. additionnal: clamp the fuel line.
Remove all spark plugs.
Install the tester in a cylinder, use starter motor with the throttle floored for some engine turns, until the compression tester gauge stops moving. Write down its number. Release the pressure in the tester with the button, unscrew it.
Repeat for the other 3 cylinders.

If compression is a bit low on a cylinder, you can try adding a teaspoon of oil through the spark plug hole and try it again. If compressions are back up, rings are the problem. If not, it usually is a valve not sealing well against its seat (worn valve, or seat, or valve guide, or bent valve)

If compression is low and similar on 2 adjacent cylinders, it usually is a leaking HG between the 2.

You can also test the coolant for oil contamination with strips, although i never did that so i cannot tell which one to buy.
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