I have had problems with low power, surging at lower Rpm's and complete dying while powering up. The boat was in the shop for 6 weeks with no fix done. 1 coil changed (Lower than others on KV Test), 1 head gasket changed (Merc.Rep. said might have a head gasket leak), head temperature sensor changed (Getting low readings). The shop mech.says he has checked everything. When run in the shops tank there is a lot of unburned fuel. On the computer everything looks fine except on the pulse widths of the injectors. At idle they are all consistant, at 2650 rpms (A) will read approx.2.85 while (B) & (C) will read approx. 3.45<br />I don't know if that makes a big difference or not.He was going to check with the Mercury rep. <br />Next I went and got a Merc. manual and started reading. I've done a few tests and all checked ok until I got to the detonation module test. The book I have shows two ways to check it. The first is to run the motor up to 3500 -4000 rpms and see if the timing is electronically advanced to 26 degrees btdc. I did this and the most advance it got was 17-18 btdc so I went on to the second test. The book says start and let idle until warmed up disconnect white with blue wire coming from det. module, voltage at idle should be 1 volt <br />well the first time I checked it (the motor might not have been quite warm yet) was 6.75 volts after that I could not get a solid reading, the numbers were jumping all over the place both positive and negative. The book says that if it is doing this the motor is detonating. What could cause this.Detonation sensor checks ok.Is the detonation module bad. Any help with this would be great.<br /><br />Thanks, Gary
