Respectfully disagree. Compression is low. - Saab 900 Bulletin Board - Saabnet.com
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Respectfully disagree. Compression is low.
Posted by jjacob [Email] (more from jjacob) on Wed, 21 Aug 2013 09:52:48
In Reply to: Re: Compression seems low., Simon S, Mon, 19 Aug 2013 12:33:27
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The compression numbers are low for this engine. Differences in atmospheric pressure would not make for more than a few psi unless he is at the top of a mountain.
His compression gauge is bad, he did the test incorrectly, or the compression is truly low.
I agree that cylinder differences are very important, but he needs to rerun the compression test.
Make sure that the throttle is held wide open during the test and that the fuel pump fuse or relay is pulled. You need at least 5 or 6 compression pulses on each cylinder.
John
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