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Ed
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Extended Cold Crank with Direct Injected Engines
February 20, 2014
The 4.3L, 5.3L, and 6.2L (RPOs LV3, L83, L86 and LT1) direct injected (DI) engines available on some 2014-2015 Corvette, Silverado 1500, Suburban, Tahoe, Sierra 1500 and Yukon models may have an extended or long crank time during cold ambient air temperatures.
Direct Injection engines may have slightly longer cold crank times than that of port fuel injected engines. Direct Injection systems run at higher pressures and the mechanical pump on the engine must build up the required pressure before the first injection event occurs.
If the temperature is below -22°F (-30°C), the recommendation is to perform an assisted start (such as with the use of a block heater).
For ethanol fuel, see #PIP5174: Extended Engine Crank Times When Using E85
Following are typical DI engine crank times using gasoline:
That's great info, I very much appreciate you posting that. Makes me feel better about it for sure.
the high pressure fuel pump is driven off a camshaft lobe (not the same ones that open valves) so it takes some engine rotations to get it pumping. i can post a screenshot of the table when i get home from work if someone doesn't beat me to it.
Last May, had the opportunity to speak to Kirk Bennion on this and a few other observations. Your response above pretty much described what he said. I personally love to her her roll up to start. Just makes me smile each and every time
My personal opinion is that you just have to live with it. People seem to forget that the starting of a production engine is a very important part of setting the engine up. The engine has to fire in all weather conditions and at a vast temperature range. The slow fire up will be designed in and could be nothing to do with fuelling! It could be to ensure the engine has sufficient oil pressure and flow before firing up (most race engines hold off ignition for several seconds to ensure oil pressure is up before firing). It could even be to add a little drama to the event. Suffice to say the cleaver guys at GM will have designed this in for a reason.
since I have the 2LT, I have memory seats. So when I get into the car I turn the ignition on and let my seat "get into position" and then press the ignition to start the car. As a result, my DI fuel system is already primed by the time I am ready to start the car up and always starts up right away..
since I have the 2LT, I have memory seats. So when I get into the car I turn the ignition on and let my seat "get into position" and then press the ignition to start the car. As a result, my DI fuel system is already primed by the time I am ready to start the car up and always starts up right away..
I do the same !! And it starts right up every time !!
I wonder if the seat adjusting is not a built in time delay to your pressing the ignition? I think most people would follow this approach so there would not be any delay in starting.
