Gas Pedal issue

[Jackpine]

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

[Unleashedford]

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

[Longshot270]

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.

[Jackpine]

Originally Posted by Unleashedford

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

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

[shotgun]

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.

[Unleashedford]

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

[Longshot270]

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.

[Unleashedford]

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