Hello all, new guy here, I have a 2009 f150 5.4l with 255,000km on it, engine is out of a 2007 f150 and has around 180,000km. my issue is this:


under acceleration the truck is very slow, it takes a long time to get up to speed, like I'm pulling a huge trailer behind me, engine sounds good other than the diesel sound that we all know and love, truck also shifts fine.


the following have been replaced in an effort to fix the issue.
-brand new cats and manifolds
-spark plugs
-air filter
-fuel pressure tested good
-no misfires/no engine light or codes


I have taken it to a ford dealership and they plugged it into their laptop and did a diagnosis, they didn't find anything wrong but agreed with me that it should pull a lot harder than it does.


any ideas would be greatly appreciated!

 

Well, I guess it depends what you are comparing it to, and what rpm you are letting it rev up to while accelerating.

That engine never did win any races, but when it was running well it pulled strongly in the high rpm range. Despite the few people in the Triton fan club, that engine has done a lot of work in so many applications.

The newer engines are miles ahead in power, economy and speed. I know none of that answers your question, but there may be no answer.....

I guess here's the test, if you have a freeway on-ramp or similar situation, what happens if you put your foot to the floor and let it rev up to redline on shifts? Does that feel faster to you, or does it seem to fall on its face?

 

When I tromp on it going uphill it almost feels like it goes slower

but it shifts normally

 

Does it feel differently than it used to?

 

I have only had the truck a couple months and it has been like this since the purchase, previous owner owned it for 4 months and he is useless, he said he did the timing and the cam phasers looked good when he was in there (not sure if that would be related).

 

Don't see fuel filter on the list of things done............

 

no filter other than in the pump in the tank, (started with the new body style)

 

another thing to add is i can do a break stand no problem and smoke the tires.

is the torque converter a possibility?
or cam phasers?

im at a loss. i did some runs and the truck does 0-60 in around 15 seconds (stock is 8 seconds according to motor trend)

 

Can you verify that the throttle body is opening all the way?

Can you verify that the pedal is telling the PCM to go full throttle?

Serving ideas.

 

could this be checked with intake off and ignition to on position while putting the pedal to floor?

 

If you have a obd2 adapter and a phone you can download forscan lite or forscan for windows and view the data in real time for fuel flow, air flow, throttle body position, pedal position, etc. That might lead to what is happening and why you aren't getting power.

The 2009 might be limited in what it can view but you should still be able to get some of that information out of it.