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 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?

4 Answers

92,405

Yes - add a block heater and if you can, park it in a garage at night.

107,745

I have seen a few of these have sensor misreads so the computer is getting a wrong reading so it is setting the systems too lean to start the truck cold. I had 1 rig that the sensor grounds had disappeared and the sensors were combining readings so the ECM was trying to average them out to make the truck run, it did run but badly and no codes were present and there should have been, so I recommend getting a good system code reader, one that has live data with freeze frame capabilities would prove very valuable in diagnostics on this truck.

40

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

40

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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