2nd Generation Specific 1986-1992 Discussion

Compression Check?

Old 02-28-2005, 05:02 PM
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Well I have a compression tester and I want to do a Check but I'm not sure what to do is there a site that will show me how to do it?
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Old 02-28-2005, 05:22 PM
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jsut put the thing in the hole and turn the car over with no fuel
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Old 02-28-2005, 05:25 PM
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Shane,

I'm writing you to tell you that I followed your compression check advice and can honestly say you gave the wrong information. Shoving "the thing in the hole" only ended up making me have to get stitches in my ***. I ask you to please refrain from posting information that is misleading.

Jared



[/joke]
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Old 02-28-2005, 05:41 PM
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Remove the egi fuses, block open the throttle, hook compression tester to trailing plug holes and crank over.
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Old 02-28-2005, 06:10 PM
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ok I'll go and do a check but I'm just wondering my car stalls when i turn it on from a cold start and also when I turn on the AC also the rpm is erratic could this problem be form low compression?
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Old 03-01-2005, 12:46 AM
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Originally Posted by Seppuku' date='Feb 28 2005, 03:41 PM
Remove the egi fuses, block open the throttle, hook compression tester to trailing plug holes and crank over.

And remove the valve stem from the tester if its a regular one Then count or check what u get on all three sides of each rotor
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Old 03-01-2005, 12:43 PM
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Originally Posted by Zelgadis21' date='Feb 28 2005, 06:10 PM
ok I'll go and do a check but I'm just wondering my car stalls when i turn it on from a cold start and also when I turn on the AC also the rpm is erratic could this problem be form low compression?



i doubt compression would be the problem if it only happens when you turn on the ac, thats prob something with the bac, maybe a vac problem or something
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Old 03-01-2005, 01:32 PM
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Originally Posted by 85turboGSLse' date='Mar 1 2005, 01:46 AM
And remove the valve stem from the tester if its a regular one Then count or check what u get on all three sides of each rotor

Forgot about that . On my tester its none removable so i taped the button open.
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Old 03-13-2005, 10:07 AM
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Originally Posted by Seppuku' date='Feb 28 2005, 07:41 PM
Remove the egi fuses, block open the throttle, hook compression tester to trailing plug holes and crank over.



First I warmed the engine. Then I pulled the green fuel relay. I also disconnected the big grey plug below the cruise control cable controller, which is behind the battery.

I got that information from:

http://www.scuderiaciriani.com/rx7/c...sion_test.html



The needle bounced consistently at 95psi for both the front and rear rotors. If you have two needle valves on your compression tester then you need to remove the on that is at the end of the hose that screws into the spark plug hole. Not the one just below the guage or you'll get really low readings. My compression tester just screws into the spark plug holes finger tight. Even with an O-ring there as a seal, I'd imagine some pressure is lost out where tester screws into the hole. If I loosen a pipe fitting on my air-compressor to finger tight, then run 95 psi through it, it leaks air rapidly. So I wonder about my results. Well my car barely uses any oil so it can't be that bad.
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Old 03-13-2005, 01:44 PM
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Coming from experince here,



Go find someone that has a MAZDA ROTARY compression tester. Bc if you look in you FSM (if you have one) almost everything related to engine problems says.... check compression. Rotary's use a different compression scale then piston engine cars.



I did what you guys are talking about on my FC and it bounced high 80's low 90's, get to someone that has a comp checker and it turned out real bad, two chambers had zero comp. So save yourself the headach and go to a Rotary specailized shop and pay them to check you car out, unless you want to spend 1600 dollars on the comp checker from MAZDA.



Just my two cents.
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