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#4571267 - 11/11/17 08:41 PM '14 F150 no codes...no start
travlnman Offline


Registered: 03/30/09
Posts: 258
Loc: Western North Carolina
3.7L, 130k , no CEL, running fine. Drove down to Tractor Supply for a few things, got in truck, turned the key and it spun fine (no battery issue), stumbled and died. Tried again, spun and spun and no start. Plugged in my Torque Bluetooth, no codes. Popped hood, checked all relevant fuses for PCM, fuel pump etc...no problem. I was about to call the tow truck, when I remembered that I changed the MAF earlier in the year after getting an Intake Air Temp code (part of MAF assy). As a matter of course,when I changed it out I threw the old one in the box and threw it in my toolbox. I located it, popped it in and it fired right up (yes I checked the connections on both the throttle body and the MAF prior to this). Not sure why it all happened the way it did...but hopefully it will help someone else. Enjoy !

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#4571281 - 11/11/17 08:52 PM Re: '14 F150 no codes...no start [Re: travlnman]
01rangerxl Offline


Registered: 04/08/06
Posts: 9252
Loc: Birmingham, AL
Interesting... aftermarket or OE MAF?

Odd for it to fail to the point of a no start like that. Good thing you had the old one on you.
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#4571286 - 11/11/17 08:55 PM Re: '14 F150 no codes...no start [Re: travlnman]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Something else is going on. Your car stars on an "Open Loop" system with factory preset values (other than the coolant temperature sensor) and then it closes the loop and starts listening to all the sensors. It's a coincidence that it started. I bet if you put the old one back in place it will still start.


Edited by StevieC (11/11/17 08:58 PM)
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#4571328 - 11/11/17 09:34 PM Re: '14 F150 no codes...no start [Re: travlnman]
travlnman Offline


Registered: 03/30/09
Posts: 258
Loc: Western North Carolina
Autozone brand....and something else may be happening...but to work through all those things, only to have it start....could be a coincidence , time will tell.

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#4571332 - 11/11/17 09:37 PM Re: '14 F150 no codes...no start [Re: travlnman]
travlnman Offline


Registered: 03/30/09
Posts: 258
Loc: Western North Carolina
A detail I left out...the first time , each time, after I would remove key, open door and check something it would kind of start, but never got to rpm, stumbled and died. If I never removed key...each time thereafter it would just spin but never catch.

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#4571333 - 11/11/17 09:37 PM Re: '14 F150 no codes...no start [Re: travlnman]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
I'd be interested to know just in the off chance that a particular OE is doing something off from other OE's.
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#4571345 - 11/11/17 09:43 PM Re: '14 F150 no codes...no start [Re: travlnman]
travlnman Offline


Registered: 03/30/09
Posts: 258
Loc: Western North Carolina
I've got a lot of things to accomplish tomorrow...so I'm going to make a point of lots of stops and starts to prove it out. Fingers crossed.

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#4571361 - 11/11/17 10:11 PM Re: '14 F150 no codes...no start [Re: travlnman]
bdcardinal Offline


Registered: 06/03/05
Posts: 11008
Loc: Santa Barbara, CA
I was going to say that isn't a Ford replacement MAF, they have core charges on them, even the new ones.
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#4571376 - 11/11/17 10:50 PM Re: '14 F150 no codes...no start [Re: travlnman]
FowVay Offline


Registered: 06/02/02
Posts: 2679
Loc: Southeastern USA
I know it's premature but you have the symptoms of a failing fuel pump.
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#4571387 - 11/11/17 11:20 PM Re: '14 F150 no codes...no start [Re: StevieC]
Ethan1 Offline


Registered: 12/29/14
Posts: 1632
Loc: 'murica
Originally Posted By: StevieC
Something else is going on. Your car stars on an "Open Loop" system with factory preset values (other than the coolant temperature sensor) and then it closes the loop and starts listening to all the sensors. It's a coincidence that it started. I bet if you put the old one back in place it will still start.


Plenty of cars will crank but not start if the MAF is disconnected

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#4571419 - 11/12/17 01:32 AM Re: '14 F150 no codes...no start [Re: Ethan1]
Colt45ws Offline


Registered: 08/15/06
Posts: 9648
Loc: Central Washington
Originally Posted By: Ethan1
Originally Posted By: StevieC
Something else is going on. Your car stars on an "Open Loop" system with factory preset values (other than the coolant temperature sensor) and then it closes the loop and starts listening to all the sensors. It's a coincidence that it started. I bet if you put the old one back in place it will still start.


Plenty of cars will crank but not start if the MAF is disconnected


Fords Ive played with will start and even run reasonably well without the MAF. Ive done it a few times on accident (left MAF unplugged). What tips me off when I do it now is the transmission shifts rougher. The load in the failed MAF table is higher than what it would actually be probably for safety so it calls for more trans pressure.
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#4571451 - 11/12/17 04:39 AM Re: '14 F150 no codes...no start [Re: travlnman]
Lubener Offline


Registered: 01/22/11
Posts: 2577
Loc: N.Ohio
Originally Posted By: travlnman
Autozone brand....and something else may be happening...but to work through all those things, only to have it start....could be a coincidence , time will tell.

I have tested these before disconnecting them and the engine should run.


Edited by Lubener (11/12/17 04:41 AM)
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#4571525 - 11/12/17 07:30 AM Re: '14 F150 no codes...no start [Re: travlnman]
Miller88 Offline


Registered: 04/09/08
Posts: 12704
Loc: Onondaga County
I always forget to reconnect the MAF when,changing air filters and never had one not start or idle. Driving is a different story.

It sounds like a fuel pump or heat soaked failing sensor
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#4571544 - 11/12/17 08:07 AM Re: '14 F150 no codes...no start [Re: travlnman]
spasm3 Offline


Registered: 05/30/10
Posts: 8662
Loc: North Carolina
I would also think the crankshaft position sensor could do this.
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#4571735 - 11/12/17 11:30 AM Re: '14 F150 no codes...no start [Re: Colt45ws]
Ethan1 Offline


Registered: 12/29/14
Posts: 1632
Loc: 'murica
Originally Posted By: Colt45ws
Originally Posted By: Ethan1
Originally Posted By: StevieC
Something else is going on. Your car stars on an "Open Loop" system with factory preset values (other than the coolant temperature sensor) and then it closes the loop and starts listening to all the sensors. It's a coincidence that it started. I bet if you put the old one back in place it will still start.


Plenty of cars will crank but not start if the MAF is disconnected


Fords Ive played with will start and even run reasonably well without the MAF. Ive done it a few times on accident (left MAF unplugged). What tips me off when I do it now is the transmission shifts rougher. The load in the failed MAF table is higher than what it would actually be probably for safety so it calls for more trans pressure.


Zetecs won't. From what OP is saying, it sure sounds like the Duratec/Cyclone 3.7 won't.

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