Cold Start & Throttle Response on x728
This morning in my still dimly lit garage I made a short video as follows:
Cold start on a 38° Morning and Throttle Response
· Setting throttle to 1/3
· Turn key to on, let fuel system pressurize
· Start Tractor
· Let tractor engine settle for 10 seconds
· Gradually throttle up to full
· Dump throttle to low quickly
http://youtu.be/37IV7cEGIGA
Sorry about the lighting, but I think you are mostly listening anyway. I made no comentary while recording so you can hear all the sounds the tractor makes:
· Sticking throttle lever at first
· Return spring on brake
· Electronics and fuel system
· Starter system
· And of course, the engine
When I dump the throttle there is a momentary seek, then settle. Is that what many of you are reporting. Certainly not hunting or surging "for a few seconds", but there is a very brief surge. I've been under the impression that was an emissions thing to burn off excess fuel during decelleration.
Let me know if you need better light, I can push it out in the sun and reshoot
Just some facts:
· 2010 John Deere x728 placed in service November 2009
· 160+ hours