Power loss/poor throttle res. in 2006 5.4L

Gruz7 · Jul 27, 2016

Well now that I've done some research I think it is supposed to have a slight gap on top and bottom of butterfly and it isn't supposed to be flush.... Correct me if I'm wrong

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stamp11127 · Jul 27, 2016

I'm not seeing any pics, only place holders.
If the tps is going you will have a dead spot or the pcm will throw a code for the voltage being out of range.

Gruz7 · Jul 27, 2016

So the throttle body i cleaned a bit more and and MAF was cleaned and also i put on a brand new air filter... all back together i drove the truck down the road for about a quarter mile and it almost seemed fine but i stopped at the end of my road for a moment or 2 and got going again and it did the same thing only a little bit less aggressive.
What it is doing is shifting slightly early and then bogging down and slugging while i'm pressing the accelerator. it gets up and goes if i punch it but it still have even some bogging and bucking with the throttle matted. *seems to be the worst with light/moderate throttle...
anybody have any ideas?
thank you guys so much!

stamp11127 · Jul 27, 2016

I would take a look at the tps operation next if you have access to a good scan tool that is able to log data on specific inputs.

Gruz7 · Jul 27, 2016

stamp11127 said:
I would take a look at the tps operation next if you have access to a good scan tool that is able to log data on specific inputs.

been testing things all night stamp with help from my uncle and found out the truck stuck in 4wd... it was a bad IWE solenoid, luckily i had already bought the updated solenoid so i installed it and fixed that problem but i still have the same issues as before...
before reading your post the nest thing i was going to check was the TPS.. my uncle has a great scan tool at his house and i'll head down there tomorrow to test the TPS and see if it needs replacing.
thanks once again for all the help guys as always

Habbibie · Jul 27, 2016

stamp11127 said:
I would take a look at the tps operation next if you have access to a good scan tool that is able to log data on specific inputs.

That's what I suggested he do if the MAF doesn't fix the problem, also reason I said go to a private owned shop is cause they'll prolly do it for free compare to a big corporation like Firestone or similar companies.

Gruz7 · Jul 27, 2016

Habbibie said:
That's what I suggested he do if the MAF doesn't fix the problem, also reason I said go to a private owned shop is cause they'll prolly do it for free compare to a big corporation like Firestone or similar companies.

Idk if you already my post in response to stamp but mu uncle is a retired mechanic, over 30 years, and he has an excellent scanner at his house i'll be headed down there tomorrow and see what its telling me.... on f150 forum there is a group of people with the same exact issue and one guy had his fixed when he simply got a reflash at the stealership... sounds somewhat convincing but might not be my issue... i'll know tomorrow afternoon and post promptly
thanks

Jb14 · Jul 28, 2016

The TB on our vehicles do not close flush. I would be interested to hear your results, just a couple months ago I developed an occasional dead spot. It is hard to diagnose since it does not happen all the time and only when almost flooring it and it will go flat as though not getting gas. I replaced, plugs, COPs, cleaned MAF and TB. I am thinking it may be a reflash. I read about 4 years back that Ford had an issue in this regards and a reflash fixed the issue.

Gruz7 · Jul 28, 2016

I'm leaning more and more towards the reflash... im going to scan it all today so i'll see anything pending and all percentages and that should give me a good idea... i got a quote from a MA ford dealer for a reflash at $112...

Gruz7 · Jul 28, 2016

Well today i tested about everything i could in a driveway an we are thinking that it could be the shift solenoids in the tranny... reason being is that everything seems relatively of ok but the tranny shifting way too early on its own is what is seeming to be the problem .... will do some more tests and scan a bit more tomorrow so i know for sure

Power loss/poor throttle res. in 2006 5.4L

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