2007 F150 4x4 stalling

As I pull into a parking space, it stalled. Started right up. Backing up it stalled. I can feel it going to stall and put it into N rev the engine and can complete parking it or rev engine and complete backing it. It nearly stalled at traffic light but put it into N and rev it several times and was able to continue on.

Not always but occassionally. I also feel it, for just a moment, miss.. while driving???

Mech. put his computer reader on it and nothing, also no check engine light ever comes on.

This truck is new to me by approx. 6 months. 165k miles. has the larger engine.

At first, it was getting approx. 14 mpg. Yesterday, upon checking it got 6 mpg. Something is definitely wrong. Mech. I use is very good and always the same person. Have not told him about the mpgs yet, thought I would ask here as he is stumped.

Any ideas as to what this might be that I can tell him?

 

Have you pulled/looked at the plugs? inspected the ignition wires? Do you know when it was tuned up last? fuel filter?

 

I would start by cleaning the MAF sensor (it's a spray... no scrubbing involved!) and also the throttle body butterfly valves. Check all hoses for vacuum leaks. Test the IAC sensor resistance to see if it is within specs.

 

no idea when it was tuned up last, thought about the fuel filter too, will ask mech. to inspect ignition wires. Will ask mech. to clean the MAF sensor, throttle body butterfly valves, hoses and to test the IAC sensor resistance.

Thank You, will get back to what is found.

 

The 5.4L with 3-valve heads? New plugs can fix many performance problems, but good luck with changing plugs. Engines of that vintage with the 3-valve heads are notorious for for breaking plugs off when attempting to remove them. A plug change can easily cost $500 to $600. That's just one reason why I traded mine before it hit 100,000 miles.

 

Does the 5.4 have the coils on the plug like the 4.6?

I had a stalling 4.6 and new coils and plugs solved the issue.
The coils on plug are notorious for going bad, but pretty cheap to replace

 

Don't know but will keep in mind for when weather permits. 3 degs. here, 5 is the high today and windy. Called off work.

I put Marvel Mystery oil in the gas tank about a day or two after posting the thread. Since doing that, no more stalling. Have put it in once more since.

There is a ticking/knocking??? that men ALWAYS remark upon which my mech. says a LOT of F150's have this sound to the engine. One man mentioned it has to do with a sensor and the timing belt (does this 2006 have a timing belt) which next time I'm into the mech. I will mention to him as well.

But, no more stalling or suggestion of stalling -- YEA FOR THAT!

Thank You.

 

Lots of possibilities. Besides what has been mentioned, a vacuum leak can cause stalling. Difficult to find unless you do a smoke test

 

The ticking/knocking could be cam phasers or even an exhaust leak at either of the exhaust manifolds. I had neither problem with mine. If the ticking goes away as the engine warms up I would lean toward an exhaust leak. At the beginning of the thread you said this was a 2007 so which is it..........a 2006 or 2007? By the way, no timing belt, it has a timing chain.

 

2006, my bad, sorry. It does not go away once warmed up. So, with a timing chain, it could still be sensors?

 

Mine was a 2006 too, but I never had that problem. The problem could be sensors, but I would lean more toward the cam phasers. If you want to try to diagnose this yourself I would suggest you read through some topics about your model and engine on the Ford F-150 Forums. You can find threads on almost every issue ever encountered.

https://www.f150forum.com/f4/


Here is a thread on the cam phasers.

https://www.f150forum.com/f4/timing-...253334/index3/

 

Thanks...mech. is going to look at truck later this week as it is now making a grinding/rubbing noise when I use the brakes. Just put new brakes on a couple of months ago.

also, seems to grind/rub even when I turn the wheel with no brake pressure at slow speed.

I have to use 4x4 to get up my driveway every day this time of year. He mentioned it may be a bearing or hub lock. He'll put it up on his hoist and take a look.