intermittent no start, low coolant light, O/D lockup buck
2001 Ford Taurus 3.0 Duratec, 118000 miles
Slight miss/buck at 40 in O/D for past few months with very low load. Thought it might be torque converter lock up problem, but car runs/ran fine and with mileage figured drive till it drops tranny out of it. Only does this in O/D. Could be a miss, but feels like TC lock up issue. NOT a coilpack problem, had this before, much different.
Sometimes when cold will idle high for about 10 seconds, then calms.
Has had a Low Coolant light that comes/goes. Coolant level is fine. No overheat even during hot summer we just had. Light would simply come on and stay on, then turn off and stay off, then turn on again.
3 weeks ago I pull into a gas station 100 miles from home. 1/4 tank. Put $20 in it to get home. Went to start it, no start. Motor spins and spins. Let it set for a minute, tried it, stayed on key for 30 seconds, started. Ran fine for another 500 miles with plenty of starts. Dismissed it as oddball thing.
1 week ago I go to get gas, car won't restart. I was close to home, called my wife to bring my truck with tow rope etc. Right before hooking up, tried car again after sitting 20 minutes, started immediately, drove home.
Today stop at walgreens. back in car. no start. let it sit 3.5 hours, still no start, long attempts with starter. another 2 hours, no start, long attempts with starter. 3 more hours, starts in 5 seconds. drive it home, back into driveway, shut it off. no start. 2 minutes later it starts immediately.
No engine codes. No missing at idle. No wierd sounds, no vac leaks. I tapped crank/cam sensors, jiggled all wiring, tapped map/tps sensors...no changes. purrs. Fuel pump sounds like it should.
I was thinking a crank sensor or fuel pump, but am not sure. Don't want to go throwing parts at it.