Compression check?

1989Gt. · May 29th, 2008, 06:28 PM

how do i do it?

nolife · May 29th, 2008, 08:04 PM

General directions...

Get a compression tester (auto parts store for about $40 or they may lend you one for free). Warm up the engine. Shut off the engine and remove the ignition coil wire and take all the spark plugs out. Screw in the compression tester to one hole at a time. Crank the engine with the starter for about 10 revolutions. Read the pressure gauge, remove the compression tester. Repeat 7 more times for the other cylinders. Depending on how your readings look, you may have to go back and do further tests on some cylinders.

1989Gt. · May 29th, 2008, 08:23 PM

oh thanks bro valueable ifno alright sounds good bro thanks

SALIV8 · May 29th, 2008, 08:43 PM

he forgot u should chock open the throttle blade 100%.

nolife · May 29th, 2008, 09:04 PM

Yes, that would help, you want to make sure you can actually get air into the cylinder.

1989Gt. · May 29th, 2008, 10:40 PM

alright thanks guys

86gtconvert · May 30th, 2008, 12:04 AM

aslong as they are all around 5 lbs or so of each other you should be ok..depending on milage...if one reads 135 and the next one to it reads 120 chances are you have a leaky or blown gasket between those..

1989Gt. · May 30th, 2008, 12:48 AM

i have 57 k miles on it

May 29th, 2008, 06:28 PM	#1
1989Gt. Hardcore Enthusiast 1989 Mustang GT Join Date: Apr 2008 Posts: 2,799 iTrader: 0 reviews	Compression check? how do i do it?

May 29th, 2008, 08:04 PM	#2
nolife MM Fanatic 91GT, 88GT, 02GT Join Date: Dec 2006 Posts: 3,057 Blog Entries: 3 iTrader: 0 reviews	General directions... Get a compression tester (auto parts store for about $40 or they may lend you one for free). Warm up the engine. Shut off the engine and remove the ignition coil wire and take all the spark plugs out. Screw in the compression tester to one hole at a time. Crank the engine with the starter for about 10 revolutions. Read the pressure gauge, remove the compression tester. Repeat 7 more times for the other cylinders. Depending on how your readings look, you may have to go back and do further tests on some cylinders. __________________ Last edited by nolife; May 29th, 2008 at 08:13 PM.

May 29th, 2008, 09:04 PM	#5
nolife MM Fanatic 91GT, 88GT, 02GT Join Date: Dec 2006 Posts: 3,057 Blog Entries: 3 iTrader: 0 reviews	Yes, that would help, you want to make sure you can actually get air into the cylinder. __________________

May 30th, 2008, 12:04 AM	#7
86gtconvert Regular 1986 mustang gt convert Join Date: Apr 2008 Location: wyoming Posts: 72 iTrader: 0 reviews	aslong as they are all around 5 lbs or so of each other you should be ok..depending on milage...if one reads 135 and the next one to it reads 120 chances are you have a leaky or blown gasket between those.. Last edited by 86gtconvert; May 30th, 2008 at 12:05 AM. Reason: typo

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May 29th, 2008, 08:23 PM	#3
1989Gt. Hardcore Enthusiast 1989 Mustang GT Join Date: Apr 2008 Posts: 2,799 iTrader: 0 reviews	oh thanks bro valueable ifno alright sounds good bro thanks

May 29th, 2008, 08:43 PM	#4
SALIV8 all motor 92 coupe 9.94@136.40 Join Date: Dec 2006 Location: Chicago Posts: 576 iTrader: 0 reviews	he forgot u should chock open the throttle blade 100%.

May 29th, 2008, 10:40 PM	#6
1989Gt. Hardcore Enthusiast 1989 Mustang GT Join Date: Apr 2008 Posts: 2,799 iTrader: 0 reviews	alright thanks guys

May 30th, 2008, 12:48 AM	#8
1989Gt. Hardcore Enthusiast 1989 Mustang GT Join Date: Apr 2008 Posts: 2,799 iTrader: 0 reviews	i have 57 k miles on it

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