Gas Pedal issue
 

here is some info

2004 f150 5.4 xlt 2wd with 3 custom tunes but only use custom 91 octane

so my issue is that when i press my gas pedal it doesnt go until i really press on it...so basically i have no clue what it is

for example: when i press the pedal it doesnt move or accelerate until i push the pedal down about 3/4 on an inch or inch...and it has a really late throttle responce...

i cant remember if i had this issue before the programmer or not....

can anyone please help?

can anyone help?!

It SOUNDS like the truck isn't downshifting or having the torque conver unlocking as soon as you'd like.

Try lowering the torque converter lock/unlock points for the 4th gear.

i changed the tune back to stock and disconnected the gryphon and it responded a little better but still had a little hesitation

How long had you been runing the custom tune? How long have you been running stock?

I think there is a way to "recalibrate" the gas pedal, but I can't remember how to do it. (It may be in the owner's manual.) 88Racing posted on this several months back and it involves depressing the pedal all the way with the ignition ON and engine off maybe while you're reciting "Ford is God!" and so on. :hehe: I don't have time to search for it right now - have to get to a Grandson's birthday.

- Jack

I remember it too, I'll see if I can find it.

Ok, found the posts!

Since it seems like the only thing you need to do is to try disconnecting the battery for 5 mins do clear the memory, then do that. The pedal pushing probably wont do anything but I copied it for refrence that these were the posts.

i have done that like 5 times already and it doesnt seem to help, would i have to turn the gryphon back to stock then do this or?

well tomorrow i am going to switch it back to stock for a week then switch it back and see what happens, maybe it might fix it? idk

Yeah, give that a shot and we'll go from there.

ill keep this thread posted day by day and see if it gets better on stock or not

hopefully i figure this thing out because my throttle response is way to slow

I think that MAY be the answer. When we apply an "advanced tune", the "drive cycle" code is erased. Now, no one has actually said this, but my feeble little brain tells me that possibly this "kills" the "adaptive learning" strategy built in to our PCMs. After all, we would not want our trucks to start rejecting the new tune's "improvements" in favor of going back to Ford's factory settings. So, set the tune to stock, disconnect the battery for 30 minutes or so and then reconnect. I'd drive it in stock for a couple of days after that before reloading the tune.

- Jack

ok so today i returned it back to stock and drove it for 40 miles, HUGE DIFFERENCE!!!!

before on the freeway when i was crusing at about 80 mpg my rpm was at 2000 rpm and when i cruised at that speed i heard my intake bog really loud so i had to let go of the gas pedal then speed back up

now when i am crusing at about 70mph my rpm is at 2000 rpm and my intake doesnt bog at all!!

and also before when i put it into park my trucks idle went extremly low or just went low and turned off on it own.....

when it is in stock it runs a lot better and seems better in a general but when its in stock it has no way near the same amount of power as it did in 91 custom tune

I wonder what could have changed since you initially installed the Gryphon and custom tunes to cause this problem to surface all of a sudden. :shrug:

How long have you had the custom tunes? How many miles have you driven on the custom tunes?

Have you made any other modifications since you installed the tunes? Performed any maintenance?

Have you changed any of the settings in the Custom Options?

Just tryin' to get some ideas flowing...

i have had these issues since i bought it on 2/17/2010

its just i thought i was normal because i have never driven another f150, but i went to my trucks house and he had the same truck as mine with a svt or sct something like that programmer with a custom tune and his truck ran awesome

and i have about 5000miles on it the most i cant remember the exact maybe 3500

and i havent messed with any of the custom tunes and the only thing i changed on my truck is i went from a 3in spacer to a 6in suspension lift

If you're showing 2000 rpm now at 70 mph, and with the tune you were showing the same rpm (2000) at 80 mph, your Tire Size (TS) is probably set too high in the tuned state, or, you have non-OEM tires on the truck and since you are runnig the "stock" tune now, your PCM "thinks" your tires are smaller than they actually are. So, with your lift, did you install bigger feet?

If so, your engine has to work harder than before to maintain that 2000 RPM in 4th gear with the Torque Converter locked. That will be noticed as an increase in engine sound.

And, since you have a 2004 truck, you may really need to clean the throttle body (and possibly the MAF sensor). Your symptoms sound like that could be the case and the problem is aggravated by custom tunes. I'd certainly pull the air cleaner housing and have a look at the throttle body. If if looks "gunky", clean it. Bill writes about this problem here: Power Hungry Performance - Frequently Asked Questions It's the first FAQ after "FAQs about Everything Else".

- Jack

my truck runs 35in tires now, and i dont want to pull the throttle body apart since its electronic i dont want to mess with it

It's not that hard to check. All you have to do is undo one hose clamp enough to slide the black intake off of the silver throttle body. Then just look at the throttle body to see if it needs to be cleaned.

The TB is not electronic! It is a mechanical device that is actuated by an electric "positioner". If the TB and the MAF sensor are not clean, then a custom tune will not work right. Cleaning these two things is simply part of routine maintenance. If you don't feel competent to do it, take your truck to a dealer!

And, those big, 35 inch feet explain the difference in RPM between a tune and the stock setting (where the truck thinks you have OEM tires).

- Jack

One of the moderators would like you to complete a service ticket.

Here's the link:

http://www.readydeskhosted.com/phptune/customer/rdlogin.aspx

I'll sent you a PM too.

thanks guys well i just submitted a ticket thing to bill and i will see what happens.....tomorrow ill try and pull the Tb out and see if its dirty or not

but if it was dirty why would it have a better response in stock then in a custom tune?


and sorry that i replied late didnt have a chance to log in earlier

Ok, and dont worry, it's not very hard as long as you pay attention to the hoses and wires coming from the rest of the intake.

I'm not 100% sure but I think the stock programming allows a larger tolerance for gunk. Then after a while the adaptive learning takes effect.

i know how to take everything apart and put it back together thats not the issue

but i heard since it has a electronic module connected to it and the tbs that there is a chance it might mess up when i pull it apart

You only have to go as far as looking at the butterfly valve. You'll be able to see if it is dirty. If it is then you just get a can of throttlebody cleaner and that is when you worry about disassembling it.

for the butterfly valve do i look around the corners or just the whole inside?

Look along the edges of the plate for dark gunk and dirt.

Google "dirty throttle body" and you'll see pictures of lightly gunked to awfully gunked.

if it does end up being dirty can i use carborator cleaner?

I would not use a straight carb cleaner unless the can specifically says it's meant for intakes (too). Head to AZ, Napa, etc. and get yourself a can of

http://ecx.images-amazon.com/images/...dL._SS500_.jpg

or this:

http://ecx.images-amazon.com/images/...8L._SS500_.jpg

EDIT: And here's a good article that might help: http://www.mobiloil.com/usa-english/...le_bodies.aspx

ill figure something out, im going to take it apart today

so it helped, still havent checked how its on the freeway though



http://i612.photobucket.com/albums/t...A_IMAG0142.jpg
http://i612.photobucket.com/albums/t...A_IMAG0141.jpg
http://i612.photobucket.com/albums/t...A_IMAG0143.jpg

after i was done cleaning it, it was like brand new with not sludge spots

Hmmm, yeah I could use a cleanin'. How does it run now?

its runs a little better, the hesitation is a lot less...but i still need to drive it on the freeway to see if it still has the bog