Throttle sticks. At times

2005 Freightliner Argosy 14L series60 pre egr , on occasion when I change gears(no clutch) the engine RPM do not drop and I have to push the clutch in then the RPM drop, any ideas ?

 

Ok thanks, I suspected it may be that, do u have specs for ohms. its ok i found this info:

The DDEC III and DDEC IV engine controllers do not use an idle validation like Caterpillar and Cummins engine controllers do. This means before you start going through all the diagnostic tests for testing intermittent power loss you should take a hard look at the throttle positioning sensor. Firstly, use a voltmeter to compare the voltage of the throttle positioning sensor wire with the ecm sensor return wire. You should see about half a volt if your foot is off the throttle. If you floor the accelerator you should see no more than 4.5 volts. Anything outside this range will cause the engine controller to recalibrate the sensor.

 

Thanks Pablo, so that is idle 0.8 volts to 1.2 volts and full throttle 4.2 volts

 

Still got same problem, volts Are 0.68 v at idle and 3.9 v full throttle on throttle sensor and all fuel line r good(no leaks, all sealed) Anyone got ideas? ENGINE is pre EGR

 

Ok thanks,
I found when it stays at say 1500RPM, if I feather the throttle it will drop rpm back down, I'm thinking maybe the throttle sensor has dirty contacts