My 2008 F150 King Ranch will not start when it get's below 20 degrees--works fine when warmer outside. New battery and cranks fine--thoughts?

Asked by 2008F150 Jan 19, 2016 at 09:05 PM about the 2008 Ford F-150 King Ranch SuperCrew SB

Question type: Maintenance & Repair

When we tried to start it the other day after sitting outside in 15 degree temp--
no go.  Towed it to the garage, it sat inside and 5 hours later started right up.  
Any ideas?

3 Answers

100

A Block Heater is a must and if you can get a truckers blanket and cover it at night. Also check relays.

100

As temps. drop the resistance of the primary circuit reduces rapidly so at 20 degrees the instantaneous current increases. At subzero temps. a temperature controlled resistance introduced into the ignition primary circuit has successfully solved this problem

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