Sensitive throttle?

[MechanicMike]

In recent weeks my truck has developed what seems to be a sensitive throttle while cruising on the highway. At highway speed and steady throttle ( foot position) I can feel the truck almost surging. When I turn on the cruise control it goes away. With in the last year I've replaced the APPS sensor due to a check engine light. There are no codes stored at this time. Around town the truck is fine. Truck still has plenty of power, and I just serviced it with all new filters ( was doing it before the service). I just notice it on the highway at a steady speed. Anyone else experience this? If so what was your cure?



I was gonna try removing the smarty to see if the problem goes away. If not I was gonna try to do a voltage sweep of the APPS and graph it to see if there is a dead spot in the sensor.



any info is much appreciated. Thanks



Mike

 

[JLandry]

Mike,



Another way to verify (or eliminate) the APPS as the root of the problem would be to connect something like a ScanGauge or a Chrysler DRBIII Scan Tool that displays APPS output real-time. If the throttle position is fluctuating while you're holding your foot steady, well then that would highly support the APPS as being at fault.



Best regards,



John L.

 

[MechanicMike]

Thanks John for the reply.



I have access to both a DRBIII and the Cummins insite program. I believe Cummins insite will graph Thottle position voltage realtime/ I will give it a try.



Thanks, Mike