<![CDATA[Madison - compression / leak down test help]]>Hi all,

Anyone around Madison that knows how to do a compression and leak down test?  Trying to determine if i have a bad headgasket on a 98 M3.  Thanks

Andrew

]]>https://wibimmers.com/topic/4695/madison-compression-leak-down-test-helpRSS for NodeWed, 16 Sep 2026 04:55:58 GMTMon, 09 Jan 2017 12:21:25 GMT60<![CDATA[Reply to Madison - compression / leak down test help on Mon, 09 Jan 2017 13:45:44 GMT]]>Disconnect the crank sensor, pull out a spark plug, stick compression tester in spark plug hole, crank engine, compare results to OEM range.  Do this across all cylinders.  *If you have a bad cylinder do a wet test.  Just add a few drops of oil to the piston before testing.

Cylinder leak down - acquire cylinder leak down tester>pull the spark plug>put engine at TDC>insert cylinder leak down tester>zero gauge>add air pressure>measure loss> should be less than 20% air loss.

That simple.

]]>https://wibimmers.com/post/75537https://wibimmers.com/post/75537Mon, 09 Jan 2017 13:45:44 GMT