Blown Ford

Wow you guys on this thread have been through hell. Ian T S i see you had LT headers installed and now you have the good ole Cataylic System Efficiency below threshold. There are two reasons for this linked to the Lt's. The O2 sensors are placed in the exhaust system at a precise location from the factory. This position is based upon an area that will maintain 600 degrees. The timing between exhaust pulses is also a factor as the O2 sensors take readings at precisely the time the exhaust pulse will hit it. Locating the O2's further away offsets this timing and in some cases (very rare) can even take you out of the 600 degree range. You will need a custom tune to correct the timing of readings so they are in harmony with the exhaust pulses. A custom tune can also provide you with much better throttle response throughout the rpm range and much better trans function.

Ian_T_S

Is this also the cause of the hesitation? I had the hesitation prior to the LT's...but prior there was pretty nasty exhaust leak which a CEL but never had the hesitation...either way the other thing left is to change the sensors and a custom tune from PHP is in the works.


Thanks for the help! The faster I get this problem fixed this becomes the project and a S/C is in it's near future

Blown Ford

Could be causing the hesitation. It's odd that it went away but then came back. Bad sensors could also be the problem. A code will only be thrown if the condition persist for 10secs or more. So whenever it acts up try to make it hapoen fir at least that long.

Fur Away 07' Screw

2007 f150 5.4 3 v. 49000 miles.
I get a harmonic vibration under load. ( boat / air-condition and hot weather).
Usually going up a onramp. Slow acceleration ( long on ramp)
Took it in last Friday Ford had it all day could not duplicate the sound. Service advisor said come back Monday and leave the truck with us for a few days.
But do a ride along. So I had the mechanic and service manager. I duplicated the sound 3 times. 1 time the mech says is that the worst it gets? I said no. They recognized the sound each time it happened. And still insist the truck is running normal.
Well I expressed my un satisfaction with the end results. I will be getting a second opinion.
As for the symptoms does anyone else have this issue?

Update: new test run today. Made sound barely. But scan shows 1 miss fire in cyl 3.
Abs issue is separate matter. Bad wheel sensor.

UPDATE:
Vibration still there. After reading all the posts I did the adjustment of the TC through my edge. For shift change 3-4 and locking of 3-4 and 4-3. +3 and +4. All I can say is that the sound, vibration and bogging down is gone. Convinced its the TC. Somewhere in the programming of the transmission it's wrong.

Same scenarios. Going up hill. Hot day. A/C on. Loan on engine. Towing. All points to TC. Right it wrong. I changed it and all Is good. Who needs Ford.

Ian_T_S

That's not the first time I've heard TC...I am hard pressed to start troubleshooting towards a torque converter when I had this problem before and MODS were done i.e. exhaust, programmer, wheels and tires and pulley's.

This did start right after I had the cam phasers, plugs/COPS, tensioners changed and re-flashed the PCM. I was told by the Ford "genius" that it was the computer re-learning itself from the update they did. I took him for test drive and when the truck falls on its face, he says, that's worse than I thought but i don't think it's anything out of ordinary....some genius.

Ian_T_S

[/QUOTE]UPDATE:
Vibration still there. After reading all the posts I did the adjustment of the TC through my edge. For shift change 3-4 and locking of 3-4 and 4-3. +3 and +4. All I can say is that the sound, vibration and bogging down is gone. Convinced its the TC. Somewhere in the programming of the transmission it's wrong.

Same scenarios. Going up hill. Hot day. A/C on. Loan on engine. Towing. All points to TC. Right it wrong. I changed it and all Is good. Who needs Ford.[/QUOTE]

Let me get this straight- it's the programming of the transmission and not the TC itself??????

Well since I just picked up an EVO CTS, I may have to give this a shot! I just find it hard to believe the programmer can fix a problem that cannot be done be re-programming the PCU at the dealership.

Fur Away 07' Screw

Its working good for me. It keeps the transmission from down shifting to soon and hunting for that right gear. Going to slow while the transmission is in 4 th gear. Seems to be causing the vibration and bogging down.

Ian_T_S

Well, the CTS couldn't save it...the truck is in the shop getting the tranny replaced. I lost O/D while driving...apparently these trucks are known for some ring breaking and ****ting O/D.

Oldrice

Keep us posted. . .


Oldrice-

greengo

As for the ticking sound, I just dealt with that on mine. I replaced the exhaust manifold on the passenger side and found the gasket cut just enough to leak. Once the truck was hot, it would expand enough to stop.