Issue with dtc codes

[Jackpine]

I hope Bill does too. I tried looking for the engine code in the VIN - and it's not there. It doesn't appear to be on the door sticker either (but I may not be recognizing it if it does).

I wonder if the accelerator position is measuring accelerator position or if it's getting its reading from the TPS? (And, I'd bet on the TPS). If I'm right, and the position changes "smoothly" with accelerator movement, you've discovered a super easy way to test the TPS and, it sounds like your TPS is ok. So, the next question is why the RPMs don't go up until you get about 7%.

If, the TPS is registering open and the RPMs don't change, then that DOES sound like something that could possibly be a programming fault in the PCM, doesn't it?

Like you, I hope the Mad Doctor comes in on this. I think you've done a good job in troubleshooting and reporting of the symptoms.

- Jack

[Power Hungry]

I also forgot to mention this thread....

http://www.f150online.com/forums/chi...t-numbers.html

This was regarding a full throttle body replacement on an '04. There are apparently plenty 'o issues with the earlier throttle bodies and they have been updated to a new version.

Hope these help.

[jerodr]

Later today i'm going to take a look at my throttle body to see what number it is(i'm sure its the old one). I'm not really all that fond of replacing the throttle body but I guess if I have to I will. I would like to try something else before that like custom tunes if it would help at all. The truck runs fine right now and it never had any problems before the programming so i'm not sure the right direction here.

Jerod

[Jackpine]

Originally Posted by jerodr

Later today i'm going to take a look at my throttle body to see what number it is(i'm sure its the old one). I'm not really all that fond of replacing the throttle body but I guess if I have to I will. I would like to try something else before that like custom tunes if it would help at all. The truck runs fine right now and it never had any problems before the programming so i'm not sure the right direction here.

Jerod

If it's the old one, then I suppose you are looking at a replacement. On the bright side, the new one will be nice and clean!

I wish Bill had commented on what you found by monitoring the "accelerator" position though. (I imagine he was in a hurry to get back to writing tunes and didn't read through our rather lengthy conversation).

- Jack

[jerodr]

I think that I am going to wait on the throttle body because everything is running fine. If the problem gets worse then I will reconsider, but for now everything seems to be working fine. I'm hopeful that I just happened to stumble upon the right sequence of events for it to happen.

[Jackpine]

Originally Posted by jerodr

I think that I am going to wait on the throttle body because everything is running fine. If the problem gets worse then I will reconsider, but for now everything seems to be working fine. I'm hopeful that I just happened to stumble upon the right sequence of events for it to happen.

Oh - DO NOT jump into a throttle body change with no more information than this! (That sounds like a whole lot of "double negatives", doesn't it)? In your place, I'd just sit tight and see what happens.

- Jack

[jerodr]

Yep thats the plan...thanks for all your help Jack

Jerod