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2nd Generation Specific 1986-1992 Discussion

Compression Check

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Old 04-27-2003, 09:59 PM
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Can i check my compression with my upper intake manifold and tb off? Will it mess up the readings with the manifold and tb off?
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Old 04-27-2003, 10:03 PM
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as long as there is nothing resticting the flow into the engine it's alright. Your numbers will be a little higher though.
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Old 04-27-2003, 10:05 PM
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Do you know how much higher?
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Old 04-27-2003, 11:02 PM
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you're not really looking for a number, you are looking for even compression



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Old 04-27-2003, 11:03 PM
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I got exactly 100 on mine with just WOT, then I detached the intake pipe (the one with the filter and air flow meter on it) and i got about 102 psi. So it shouldn't be more than 5-10 psi higher with missing manifolds.
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Old 04-28-2003, 08:04 AM
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thanks alot guys!!!
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Old 04-28-2003, 11:50 PM
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Originally Posted by j9fd3s' date='Apr 27 2003, 08:02 PM
you're not really looking for a number, you are looking for even compression



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well, when I tested mine, I looked for even bounces, then I put the valve back in to see what the actual pressure was.
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Old 04-29-2003, 01:35 AM
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This is kind of funny, I'm going to check the compression on my AE tonight without the UIM/LIM, turbo, or manifold. The car wasn't running too well, and wasn't pulling as much vac at idle as normal. I got a little over motivated last night and pulled everything off.
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Old 04-29-2003, 10:56 AM
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:crosses fingers:



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Old 04-29-2003, 02:49 PM
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My compression was great with all that stuff off I was getting nice consistant bounces over 90 psi almost to 100 psi. So I'm happy. Time to put the bitch back together.
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