Sergeant York had a CAT scan...

[serpico760]

My neighbor's grandson is a mobile mechanic with the local CAT dealer. An exchange for a nice brass CAT belt buckle, he plugged into my truck and gave it a full scan and analysis. Everything looked good!

 

[GeneralDisorder]

Have him enable your cruise control. It takes 2 minutes.

 

[serpico760]

Will do when I have the hardware to control it

 

[MatthewWBailey]

How is fast idle #2 setpoint triggered?

 

[GeneralDisorder]

How is fast idle #2 setpoint triggered?

Not sure but could be with some combination of the cruise control stuff. When the trans is in neutral you can control idle speed in small increments with the cruise control accelerate and decelerate buttons.

 

[MatthewWBailey]

Not sure but could be with some combination of the cruise control stuff. When the trans is in neutral you can control idle speed in small increments with the cruise control accelerate and decelerate buttons.

Is it possible to trigger it on the A1? Mine seems to switch over from high to low fast idle occasionally when cold. Happens a lot

 

[Wingnut13]

My A1 will slightly raise idle when cold and idling on its own. But it waivers and never really reaches a high idle. However, if I use the rocker switch in the cab, it idles right up.

 

[GeneralDisorder]

Is it possible to trigger it on the A1? Mine seems to switch over from high to low fast idle occasionally when cold. Happens a lot

My A1 will slightly raise idle when cold and idling on its own. But it waivers and never really reaches a high idle. However, if I use the rocker switch in the cab, it idles right up.

@Lostchain was telling me about this effect. It seems to be a quirk of the 3126 engine computer. The C7 trucks don't do this. Their idle is the same at all temps on my truck and every other one I've worked with.

I'm not sure what the idea was with that programming.

 

[ckouba]

@Lostchain was telling me about this effect. It seems to be a quirk of the 3126 engine computer. The C7 trucks don't do this. Their idle is the same at all temps on my truck and every other one I've worked with.

I'm not sure what the idea was with that programming.

Mine (3126) goes to fast idle on the switch or if it's cold and has been idling for a while without being exercised. It doesn't waiver, but more ramps up to the fast idle of the switched function. Not a aggressive ramp, but not an overly casual one either. It does hold the idle speed when it gets there.