compression check - Ford Mustang Forum
 
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post #1 of 4 (permalink) Old 11-07-2013 Thread Starter
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compression check

i was going to do a compression test on my car but i was a lil confused. am i supposed to unscrew each spark plug and test them one at a time? , some guy at autozone said i had to remove them all before i plug in the tester and crank my car over. idk bout that

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post #2 of 4 (permalink) Old 11-07-2013
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I allways do them one at a time.Be sure to disable the ignition and fuel.



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post #3 of 4 (permalink) Old 11-07-2013
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Reason you remove all the plugs and block open the TB, is to make it easier for your starter to spin the engine. You do not fight against compression and wear the starter/battery.

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post #4 of 4 (permalink) Old 11-08-2013
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Better to remove all the plugs and then test one cylinder at a time with the throttle wide open. It makes it easier to turn, but WOT makes sure the cylinders fill. If possible to a leakdown test as well, it can be very helpful.

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