Help Heavyd

Hi, I may of figured out problem of random miss, but need further info from you. I changed throttle position sensor in foot pedal about 2 years ago, Random miss has been around since then. I was recently told by justanwswer, that throttle sensor needs to be calibrated when changed... is this true? I explained the idle with cruise on, is much worse than using just the pedal. He stated that ecm uses different parameters for cruise and foot, and the ecm must be recalibrated using Insite, after changing sensors. Does this sound right? I don’t need to be wasting money on chasing ghosts. Thanks for your input.

 

P.S. I changed timing/metering actuators, fuel shut-off solonoid, checked for air in fuel, fuel pressure, and water in fuel. Injectors are all newer, and overhead just done. The miss does seem to be electronic in nature.

 

It’s a 2009 ISX CM871, in a 2011 International 9900. Ok tried key on, full application/ return. Started, set cruise/idle to 1100rpm. Still has slight miss, then high idle kicks out on it’s own after approx. 1 minute. Rev to 1100rpm using only foot, miss is noticeably reduced. If I set cruise/idle to 1050rpm or less, it stays idling on it’s own. It has to be electronic-cruise control/idle related, no?

 

Ok thanks Heavyd. Guess I’ll just run it. Already wasted enough money trying for a smooth idle.