mmurphydds
Bronze Member
I had a 2005 JD 4320 that had a glow plug preheater for cold weather (or any weather) starting...push in the key switch, indicator light on dash lights up, count to 20, start-er-up. I get that, no problem or confusion. Now I have a 2011 JD 4720, theoretically the same machine with higher turbo-boost. But they went and did something different with the starting protocol, and the manual is really no help in terms of explaining it. They call this newer system an "air-box preheater".
So here's the question: How does this new system work or differ form what I had before?? The new system has a scrolling text in the dash display that says "Wait to Start" when the key switch is pushed in. But when the weather is cold, it seems that the "Wait to Start" text never goes away, just keeps scrolling. Am I just not waiting long enough? And what exactly is happening while I'm waiting...I assume a coil somewhere is heating up intake air?? How is this system better than the tried and true method diesel engines have been using since just about forever??
The engine starts fine, sometimes takes longer to crank than others, I can't tell if the new system is working or not...not like the older model's glow plug heater that let the engine pop right off when you started it up. I don't want to gum up the works or damage anything by mistreating it.
I feel stupid with all the electronically controlled stuff that is not well documented...what ever happened to a choke cable/lever...or a well written manual to educate the users. So, I'd be grateful for user tips and some education from some of you guys that are a lot smarter than I am!!
So here's the question: How does this new system work or differ form what I had before?? The new system has a scrolling text in the dash display that says "Wait to Start" when the key switch is pushed in. But when the weather is cold, it seems that the "Wait to Start" text never goes away, just keeps scrolling. Am I just not waiting long enough? And what exactly is happening while I'm waiting...I assume a coil somewhere is heating up intake air?? How is this system better than the tried and true method diesel engines have been using since just about forever??
The engine starts fine, sometimes takes longer to crank than others, I can't tell if the new system is working or not...not like the older model's glow plug heater that let the engine pop right off when you started it up. I don't want to gum up the works or damage anything by mistreating it.
I feel stupid with all the electronically controlled stuff that is not well documented...what ever happened to a choke cable/lever...or a well written manual to educate the users. So, I'd be grateful for user tips and some education from some of you guys that are a lot smarter than I am!!