DC72 Posted May 15 Share Posted May 15 Looking for help! This unit runs as a yard truck with PTO for auger/blend system. Normally runs at 1100rpms while pto is engaged. Problem is it will intermittently stumble/hiccup while running on the high idle, sometimes once or twice other times repeatedly. I cannot run this down the road to a dealer to get it plugged in and no one will come here due to age and software needs, internet etc. Any thoughts on what could be causing this? I have already replaced accelerator pedal with solved the problem of occasionally not staying on high idle, originally thought they were the same problem but apparently not! Appreciate any help...Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/ Share on other sites More sharing options...
Joey Mack Posted May 15 Share Posted May 15 is the mil light on? Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/#findComment-575767 Share on other sites More sharing options...
DC72 Posted May 15 Author Share Posted May 15 just the lightning bolt, not check engine light Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/#findComment-575771 Share on other sites More sharing options...
Solution Popular Post steeler Posted May 15 Solution Popular Post Share Posted May 15 Yours doesn't have a check engine light, just the lightning bolt and red shut down light. You can get the lightning bolt to blink any active codes for you by turning cruise off, then hold down (I think it's down?) the set/decel switch until the light starts blinking a 2 digit number... 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/#findComment-575781 Share on other sites More sharing options...
fjh Posted May 15 Share Posted May 15 What trans? Allison? Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/#findComment-575782 Share on other sites More sharing options...
Joey Mack Posted May 15 Share Posted May 15 Retrieve the codes. They are in pairs. Then oost them here. Follow Steelers instructions 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/#findComment-575791 Share on other sites More sharing options...
fjh Posted May 16 Share Posted May 16 4 hours ago, fjh said: What trans? Allison? K so no nibbles on that ! So check and clean the flywheel sensor if it’s a standard! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/#findComment-575812 Share on other sites More sharing options...
DC72 Posted May 16 Author Share Posted May 16 I get code 64 Eaton fuller trans...I changed both cam and crank sensor, cruise will not raise idle at all now Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/#findComment-575848 Share on other sites More sharing options...
Joey Mack Posted May 16 Share Posted May 16 Cruise wont work with active codes Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/#findComment-575855 Share on other sites More sharing options...
DC72 Posted May 16 Author Share Posted May 16 abs light is also on, I did not think that was relevant at first but maybe it is. I was hopeful with crank sensor as plug crumbled in my hand truck side cleaned up okay but sensor side was junk, also sensor was covered with metal dust. Checking ohms as instructed above next. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/#findComment-575856 Share on other sites More sharing options...
DC72 Posted May 16 Author Share Posted May 16 abs ecu resistance across yellow and green is 97 Ohms Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/#findComment-575859 Share on other sites More sharing options...
Popular Post Mackpro Posted May 16 Popular Post Share Posted May 16 You’re probably on the right track. The cam and crank sensors ( same part number) can cause this issue. The camshaft sensor needs to be adjusted with shims. I’ve seen the where the camshaft floats to close to the sensor and sets a code 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/#findComment-575860 Share on other sites More sharing options...
Popular Post DC72 Posted May 16 Author Popular Post Share Posted May 16 UPDATE... Had a guy in truck holding the cruise control accel button and I started wiggling wires, when I got to the connector on the ECU idle ramped up and worked as it should. It is working right now I have product to blend on Monday I am curious to see if it will maintain the high idle throughout the process after that I will pull that connector and check for any corrosion. Thanks to all for your input and help, everyday is a learning experience! 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75521-2006-mack-cv-713-120l-ami-370-stumble-on-high-idle/#findComment-575868 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.