International Prostar Accelerator position sensor...

Rawze of rawze.com knows a lot about Prostars. He also has some youtube videos.

 

jet farmer
Hey Iam a grain farmer and I have the exact same issue with the same truck!. Did you ever find out what was causing this SPN 91 code?
Thanks so much

 

Have you tried anything yet. Majority of the time it’s in the wiring, if you’ve tried a pedal and it’s still happening best bet would be an overly harness from the pedal to the ECM.

 

Ok I have found my problem. I pulled off the most rearward connector on what i believe to be the Fuel Control Modual (Behind the fuel filter housing) NOT the ECM.
I soaked the pins with electrical contact cleaner and blew off with compressed air and cured the spn 91 problem. Iam missing my little black plastic splash shield in front of the connector and recently washed the engine, Iam guessing there was some corrosion on the tiny pins as they are so small it is hard to see.

Also something to know about when your DPF light is on...
-You cannot do a parked regen when you have an active engine code ("engine warn") is illuminated on the display. You have to fix that problem first. It will inhibit the regen otherwise.

-Not that it was my issue, but I successfully removed and cleaned my DPF filter myself, rather that send in for baking. I removed the filter, and started to pressure wash it, however hardly any water made it through the other side. I soaked it with engine degreaser and pressure washed, soaked again with degreaser and pressure washed, and again and again and the pressure washer stream of water was dampened (of course) but was now making it through the filter all the way around. It washed out Alot of black soot collected and very clean water coming out at last.

 

Forgot to mention I have the Maxxforce 13 Engine. 2011 International Prostar.

 

Did the code ever come back? Or was it a for sure fix?