Re: Finding TDC - Saab 900 Bulletin Board - Saabnet.com
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Re: Finding TDC
Posted by Saabnutt (more from Saabnutt) on Mon, 24 Aug 2009 15:48:08
In Reply to: Re: Picture of the spark plugs, Bob_SAAB_101 [Profile/Gallery]
, Sat, 22 Aug 2009 20:00:26
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To find exact TDC. Remove a spark plug and shine a light into the hole and turn engine until you see the piston top. Do this on # 1 cylinder. Use a wooden dowel and look for movement of up and down movement of dowel. When you get an approximate TDC, mark to flywheel when the dowel start to move down. Do this on both rotations and then when you have two marks on the flywheel, divide the difference. This should be exact TDC since there is a few degrees where the crankshaft will just swing the piston around without any up and down movement. That's why I always divide the difference from the marks I made on the flywheel. I"m wondering if you ECU is suffering a loose connection. Try unplugging and replugging the ECU harness.
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