Small hesitation at frwy speed on ISX CM871

[Dieselboy]

(01-26-2024 )Rawze Wrote:  

(01-26-2024 )Dieselboy Wrote:  It has a brand new EGR valve on it about 7k miles ago. As well as pipe.

and the delta-P sensor.. and its cross-pipes?.. IMAP and all the other sensors that are old?.

Delta-p alone can cause the accel. to hesitate like your describing.. nonetheless several other sensors if they are reading incorrectly.

I remember when mine acted up, It refused to accel. for several seconds at a time, like your foot was not on the pedal, .. then took off like a rocket once it caught up to itself. - It was the delta-p sensor cross tubes dirty that caused it on mine.

of course, there are many reasons that one can act up like that aside from just sensor reading incorrectly.

worse case scenario, someone can monitor all the important engine data and see what is triggering it too. Fuel control state, and what it switches into/out of in particular...
ref: http://rawze.com/forums/showthread.php?t...3#pid58693

Upon some research it seems that if could likely be the pedal assembly/throttle position sensor. It is made by Kongsberg and there is a magnet that rotates with the pedal movement that the sensor reads. Quite a few other RV'ers have reported having to replace theirs and it cleared up the problem. I need to bust out the multimeter to see if it gives me any insight. Process of elimination I suppose.