There's movement on this, but it will take time - since Dave is on the road for a couple of weeks.

 

I think the deal with Brian was when I went to go get my tranny built I was already set on being live tuned. He knew that and I think he was just being kind and not gonna bust my bubble about tunes. When I went to bts I had my 38r and stage 1's installed. One thing Brian did say while I was there was man, the shift is ridiculous. But he kind of expected that cause my tuning was set for a factory tranny. While I was there I did have a chip burnt for a friend of mine who just happens to have a truck like mine except 6speed. 4 door crew dually with replacement bumpers front and rear. Now his truck is stock except for the chip and can run circles around mine as far as pulling and fuel economy.

 

If you have the means an this goes for anyone, can you check the accelerator pedal position at rest, wide open throttle, and at what point the ivs is switched, and when your truck actually responds to throttle. If you can write these thing down in % and voltage I would like to compare. This would all be done with the truck off except to find when the throttle actually responds to engine rpms.
Rich I know we said mine was in spec, but I just got off the phone with Brian at bts and he thinks there is more going on, mainly because after swapping PCM and pedal assembly with my other truck, there was no change. He is thinking we new to check voltage to my system to be sure it's reading 5 volts.
It's gonna kill me not bring at my truck to compare results!

 

There is one more twist to all of this that I forgot to mention before... and it's important.

I have trepidations about running the rig at the weights discussed in OD (with his gearing) for this reason: Flat with no wind - Dave tells me he's running 1000 degrees F EGTs, and his data shows Engine Oil Temperature hovering between 200 and 210 degrees F. I don't tow that heavy, so with this additional information - I again put it to the heavy haulers for input.

As for the IVS, Dave's truck pulls off the Idle Validation Switch at 1.0 volts on the TPS. While I prefer to see something closer to 0.2V, 1.0V is still within factory specs. I suspect if this voltage was known by the tuner at the time, the tuning could have been easily adjusted to accommodate it.

I have never seen a MAX TPS of 5 volts, but I've seen it go as high as 4.5 volts. The most common WOT voltage I've seen is 3.88V (which is what Dave's truck shows). With that, we have a 2.88V range to work with from MIN throttle to MAX throttle on Dave's truck. It's important for the tuner to know these numbers, so he can incorporate them into the tune. Dave's throttle voltage may very well be "the root of all evil" in his truck.

 

Pedal off = 0.58 volts

Pedal floored = 3.72 volts

Reference Voltage = 5.01 volts

Vehicle Voltage = 12.6 volts

Truck off during check.

 

Thanks, did you happen to notice when the truck actually responds to the pedal and when the ivs is activated?
Come on guys get me a few results to compare to. If you have AE it's really easy.

 

Y2KW57's TPS MAX is slightly less than yours, and with his MIN at just 0.4 volts less than your IVS trigger point (all taken with the factory NGS), this confirms your TPS is doing what it should. Knowing how thorough Y2KW57 is with his truck, I'd say he's probably the best reference to use.

With that (and all the previous work you've done), I'm completely satisfied your TPS is normal... and I strongly feel it's time to look elsewhere.

 

By "when the truck actually responds to the pedal"... do you mean you want us to measure pedal deflection before a change in rpm is detected?

On the IVS, I was able to isolate the turn on voltage to be at exactly 0.78v.

So, from 0.58v to 0.76v, the IVS is OFF. At 0.78v, the IVS is ON.

I removed the three floor mats I have in the truck, and re-measured maximum AP. If I really mash on the go pedal, I can squeeze 3.74v.

This isn't quite the 3.85v to 3.95v that Oregon Injection Service claims that one should be looking for.

I'm not sure if my truck qualifies as a "reference" or not. I will say that mine is not influenced by any chip, tune, or program, and Tugly is correct in that I used a factory scan tool to measure the AP voltages reported here.

Also, I do not have adjustable pedals, and I remember in years past there were some issues with those when they first came out. I also remember that a popular mod that ran it's course over dozen years or so ago was a reworked fixed pedal assembly. People would send their original pedal in to a guy who would modify them to make the truck feel like it was going faster. I don't remember what the guy did... if he extended the voltage range, or moved the range around... or what. In fact, I had completely forgotten about this mod until just now.

 

from a thread Pop posted in....

If it were mine, I'd pop it out (it's only three small nuts that hold it in). That way you can use a DVM to see if the switch is electrically operational, whether you can hear it or not.

Here's a schematic of the wiring for the IVS part of the truck:
http://www.e-toolbox.com/ads/wiring/va137402.pdf

and here's the accelerator pedal position sensor part:
http://www.e-toolbox.com/ads/wiring/va137404.pdf

What you're looking for is at the bottom of each of those pages.

These diagrams are for what's called "early production", and "late production" are the ones with a single plug instead of two, but the WIRE COLORS are the same in both cases, so test the IVS by reading the continuity between the pins that are attached to the RED/LT GRN and RED/YEL wires.

Here is the diagram for "late"
http://www.e-toolbox.com/ads/wiring/va163297.pdf

The IVS should read "closed" at the idle position only.

 

I myself have been kicking around the idea that something isn't right with my TPS which sometimes causes a shifting issue. And this thread has some great info here for me to see if I actually do have an issue. Here is a thread from another forum about blueprinting the throttle pedal assembly it was writiten for OBS but I do believe specs are the same for the SuperDuty. Please correct me if I am wrong.
Blueprinting the Throttle pedal assembly - Ford Diesel Power Forums

 

I think there is one on FTE here with pics and all. I would like to play around with this but you would have to disassemble the assembly and not sure I could get it back together.

 

So I'm back home for two days, AE locked and loaded! First thing I'm checking for comparison is the pedal assembly. I know rich, just covering the basics.
Vehicle voltage: 12.3

Vehicle ref volt:4.99

Acc ped percent @ rest: 12.94%
Volt: .64

Floored:82.75%
Volt:4.11

Ivs activated:20.0 %
Volt:0.99

Truck responds to pedal:23.92%
Volt:1.15
Meaning a fluctuation in the rpms begin to change.

 

Scribing. Good one to keep up with.

 

Bout to do some logging, prolly take a video and post. I was driving to town earlier and noticed in my stock tune at 65 my truck won't shift into od unless I let out on the throttle. This is an empty truck.

 

Without going back and reading all the posts again, did you remove your tuner for all this trouble shooting?