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2nd Generation Specific 1986-1992 Discussion

How to use a compression tester

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Old 11-21-2006, 02:50 PM
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Originally Posted by MtnRacer' post='846203' date='Nov 21 2006, 01:58 PM

Unplug the fuel pump and crank it over a few times to get rid of any fuel left in the delivery system.



Steve
There's also a fuse under the hood, either EGI INJ or EGI, I forget which. I pull that to unflood my car.
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Old 11-30-2006, 03:46 PM
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Ok so i know we went over tis before but when you check it, i know 3 even bounces but what about should they bounce at? or does it matter?
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Old 11-30-2006, 03:57 PM
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I don't think it really matters if you're just trying to find out of an apex seal is busted, and I'm pretty sure it'll be different based on what engine you have (S4 vs. S5, n/a vs. turbo, etc.), or the mileage on your engine. My good rotor bounced at about 70 psi.
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Old 12-01-2006, 01:06 PM
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ok thanks
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Old 12-01-2006, 05:21 PM
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This is probably a stupid question but do i need to check all 4 plugs or just 1 on both sides?
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Old 12-02-2006, 10:46 PM
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Both plugs on the same housing will get the same compression reading.



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Old 12-04-2006, 06:22 AM
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Ok thats what i figured.

Thanks
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