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Cranking Pulse Width's
Posted: Fri Dec 14, 2007 8:22 am
by marcusp_88
Does anyone know these for a cold start on a zetec, as im having mighty trouble getting it running in the cold weather.
all advice hugely appreciated
Posted: Mon Dec 17, 2007 8:57 am
by strain
Hi, Do you have a Wideband? if it's not then start from less to more until you get a good start, How the engine start hot?, What PW?, try double the hot PW for cold.
I hope it helps you.
Regards,
STRAÃŽN
Posted: Mon Dec 17, 2007 9:50 am
by marcusp_88
yes i have wideband, how can i tell from using this?
cheers
Posted: Mon Dec 17, 2007 10:19 am
by efahl
A few years back another board member sent me some Ford calibrations with cranking pulsewidth given as a function of engine coolant temperature. I plotted the data on a log scale for PW and both engines turned out to be linear, so from that I gather that cranking PW has exponential decay.
Try this in the standard MS-II cranking pulsewidth table and you'll see the shape of the curve that is appropriate. If you have a good hot cranking number, try scaling the numbers (minus open/close time) that I give below and see if that works for you.
