I am running A 98 Road King Clasic, With magneti Morreli fuel system. Just Installed a PC3, and am having some strange issues. I reset my hot and cold idle settings,and everything seemed good. next day on my way to work, it would not come down from high idle setting for about 10 miles.

I checked for intake leak, seems good, pulled the fuses and let sit overnight. went to work today and same isue, and today at lunch it actually was fine then for no reason it went up to high idle again, after it was allready warm. plus the temp outside was a about 96 deg today.

Any thoughts or advise would be a help.

 

Make sure you reset the throttle position calibration in the PC3 drop down menu at the top of the page, it might not be calibrated and not returning to the 0% colume on the map.

If it continues to act up, put the ECM connector harness back onto the ECM and see if it continues to find high idle, if it still continues, best bet is a temperature sensor out of parameters. In cold mode (high idle) the ECM is locked and is released by the temperature reading of the temp sensor, when released it will then start altering fuel by head and inlet temperature, it is also possible that the temp sensor is at its edge of designed parameters and not strong enough for the PC3 to operate correctly but will feed the MM ECM without the PC3, it happened to me on a engine position sensor with a PC3.

Note: the temp sensor will mess up and not send a trouble code.

 

Thanks for the good info 97 Bagger. I rechecked my manifold gaskets, and found A leak. I Hope a new set of gaskets will do the trick. Is there any aftermarket gaskets that hold up better.

Thank's Again