I have a 2006 Expedition. I live in Wyoming and last August/September, our Expedition began stalling out while driving. Typically in situations like breaking for turning or coming to a stop. Usually it would start right back up. On occasion, the first restart attempt would fail, but would start on the second attempt. I first replaced the ignition switch, then a new throttle body with new IAC and TPS. No change. I then took it to the local Ford dealership which their first recommendation (I know the Ford Tech), was to replace the fuel pump which I agreed with. However, even after the fuel pump the problem persisted. After the fuel pump failed to remedy the issue, I spent time driving it (my wife typically drives it), to see if I could duplicate the stall out on command if you will. I would have the best luck getting it to stall when I would drive and somewhat hard break while turning to the left. 3 out of 5 times, I could get the truck to stall. Also, the engine would have to be at full operating temp. It spent the next 8 weeks at the dealership of who couldn't duplicate the issue. I even went in and drove with the Ford Tech. No stalling. I ended up taking it home the 2nd week of November and have been driving it every day since without any issues. Then, yesterday we hit upper 60's and low 70's for the first time this year and what do you know.....the issue is back. It's apparently affected by the outside air temperature. Has anyone experienced anything like this? What would be affected by the outside air temp??

 

I have a 2009 expedition and have the exact same problem. It runs fine all winter. As soon as we hit the mid 70's the vehicle dies after it has heated up. The hotter it is the worse it is. If it shuts off while I am traveling fast enough and I keep my foot on the gas it fires back up, so stalls going down the highway are minimally disruptive. In town or stop-and-go traffic is another story. Any luck on a solution for this problem?

 

I have the same problem on my 2012 limited, but only happens when the tems are cold and before the engine reaches operating temperature. I have checked the battery and alternator, changed the mass airflow sensor, and checked the filters. It doesn't give a check engine light or store any codes. I'm struggling to find any answers.

 

The temperature and abrupt driving moves may point to a wiring harness problem. A signal wire may be making contact with the frame or something else. Maybe it is more likely when plastic looms are hot and flexible?

I would use Forscan to watch and record the values for all the sensors that affect the engine operation.

 

Hi,
Did you find the cause of your stalling issues?

 

Unplug the VCT Solenoids: Next time the truck is fully warmed up on a 70F day, unplug both VCT solenoids under the hood and drive it. If the truck does not stall while they are unplugged, your VCT solenoids are sticking or your engine has low hot-oil pressure.
Check the Wire Harness: Inspect the main wiring loom near the back of the engine and the steering shaft for any signs of rubbing or exposed copper or battery cables chafe against the air conditioning lines.
Fuel Pump Driver Module can overheat cutting power to fuel pump.
Your engine oil gets much thinner when the weather is warm. When the outside air is 70°F, your engine runs hotter than it does in a freezing Wyoming winter. Thin, hot oil causes the engine’s hot oil pressure to drop at idle. The thin oil and low RPMs cause the oil pressure to drop too low to properly control the VCT solenoids. The cam phasers get "stuck" in an advanced timing position instead of returning to base idle timing. The engine essentially chokes itself out and stalls. When you try to restart it, it might fail on the first crank because the timing is still advanced, but it succeeds on the second try once the oil pressure equalizes and the phaser snaps back into place.