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Old     (rgoranson)      Join Date: Jul 2004       07-22-2009, 1:57 PM Reply   
My 2005 Sanger with Black Scorpion has been running poorly all season. I had a mechanic out to the lake. He ran his computer. Nothing was wrong according to his computer, but he agreed that I had a misfire. The misfire happens under load at 1500-3000 rpms. The boat has new cap, rotor, and plugs. Prior to coming to the lake, the mechanic did a drop down test to check the valves, and checked intake manifold pressure at his shop. No problems with either. He has been working with Mercrusier and his shop is certified. They came to the conclusion that we need to have the ECM recalibrated. I asked if I should run it through the season and send the ECM in this winter. They said this would be a good plan. I have had other mechanics look at the boat and have found no problems. The backfire continues... Any advice?

 
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