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Compression Test?

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Old May 5, 2007 | 03:43 PM
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Compression Test?

How and where i can do compression test? ive finally decided to install a turbo
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Old May 5, 2007 | 06:33 PM
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Originally Posted by Defcon5Es
How and where i can do compression test? ive finally decided to install a turbo
You could run down to the local shop and pick one up for around $50. very easy to do. disconnect the relay that sends fuel into your engine so gas wont be pumping into your engine then disconnect all spark plug wires and take out the spark plug of the cylinder you want to test. screw in the end of the hose that is on the gauge and crank the engine over 3 or 4 times to see what the compression is. put the plug back in and move down the line.

all of the compressions should be somewhere within 20-30 of eachother? (just a guess) closer the better

I believe that is what you wanna do if i understand you correctly. any objections please post.
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Old May 5, 2007 | 07:36 PM
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^^^he is pretty accurate. it just might be easier to disconnect the cam sensor on the right hand side of the head when youre facing it.
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Old May 5, 2007 | 08:36 PM
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Originally Posted by petey pab
^^^he is pretty accurate. it just might be easier to disconnect the cam sensor on the right hand side of the head when youre facing it.
that could work as well
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Old May 6, 2007 | 03:28 PM
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i'm still a newbie when it comes to engine...is there a possible way i can take it to a mechanic shop and do the testing there? cause i might screw my engine up if i do it by myself.
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Old May 6, 2007 | 04:04 PM
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i guess but its very easy. if you dont feel comfortable with it, just do that and take it to a shop.
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Old May 6, 2007 | 04:18 PM
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what does compression determine exactly? thanks.
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Old May 6, 2007 | 04:23 PM
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if there is bad compression something is wrong with your cylinder. exp. bad rings, head gasket, or something having to do with the valves

Good compression lets you know your cylinder is functioning ok
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Old May 6, 2007 | 06:53 PM
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hey thanks LancerRally! here's a :cheers: ill take it to the mechanic shop tomorrow. im hoping my engine is ok, but if it fails what should i do?
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Old May 6, 2007 | 07:00 PM
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Just did a comp test yesterday all were 190-195psi across the board. I know someone already explained it but warm your car up to operating temp,remove plugs,disconnect fuel pump fuse(under the hood fuse box)it will tell you which fuse it is in your owners manual i forgot.screw in you comp tester gauge, like the guy said before crank your engine over 4-5 times with the throttle plate open(hold the gas pedal down) and check compression and the move to the next one. Very easy and i would rather pay the 40 bucks and have the tester the rest of my life then pay a mechanic 50 every time. Hope this helps.
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Old May 6, 2007 | 07:23 PM
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If your taking it to a dealer and it fails.....tell them to fix it. haha, if you dont really feel safe doing the compression test yourself, you prolly wont feel safe replacing a head gasket, rings, or even doing valve work. good luck with it all. let us know wut it reads
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Old May 8, 2007 | 02:13 PM
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changed of plans!taking it to the mechanic shop this weekend...cant do it on the weekdays. cause i have too much ******* work to do hahaha. i still have to finish my website project. sorry for the delay u guys
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Old May 8, 2007 | 02:17 PM
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most shops usually cost more on weekends. but u might get lucky
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Old May 8, 2007 | 04:17 PM
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oh really!!!i didnt know that!? i might take it to my family friend's mechanic shop then=)
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Old May 8, 2007 | 06:36 PM
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It usually depends on the shop. id call around and ask
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