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for those of us who have never seen the DiamondBird Mod...

Originally Posted by BLACKOUT FX4 The Diamondbird Mod
Not sure if anyone has seen the posts by DRE23 within the "Throttle response 2009+" thread. Member DRE23 posted an interesting method to recalibrate the throttle on EFI engines, Apparently this method has been posted on other forums with great success. I was skeptical at first so I tried it on my Tacoma work truck and to my surprise, It actually made a difference.. So this morning I tried this method on my 2010 FX2 and no BS, It made a big difference in my throttle response, The front end of the truck actually raises up and the tires let loose when i punch the gas pedal. I did some research on other forums about this and the common consensus is that this resets the factory throttle setting and can be put back to factory by disconnecting the battery if need be.

Does anyone know how and why this works and how the heck someone figured this out? It's pretty cool and FREE!

TRY IT!

Throttle Calibration

Throttle calibration can substantially improve throttle responsiveness over "factory standard." Many people notice what appears to be sluggish throttle response or a "dead area" at initial accelerator depression. Throttle calibration can take care of these.

1) turn the key in the ON position (don't start the engine)
2) press the gas pedal down slowly all the way down
3) let go of the gas pedal fast so it come back up
4) turn key into the OFF position
repeat steps 1-4 two more times then start engine.

Most drivers notice an immediate change in throttle response, but depending on your driving style, you may need to repeat this procedure periodically due to the computer's adaptive programming. You likely need to repeat this procedure any time the battery is disconnected.

Thanks to DRE23 & Diamondbird for the info!

Bill

 

I just tried it and can't say for 100% it was the recalibration as it's 37 degrees here in ChicagoLand but I'd say it made a difference...throttle response is quicker and crisper (less lag)...YMMV...

Thanks everyone

Bill

 

I hadn't, but didn't realize y'all were waiting with such baited breath.

I just called on my lunch break, and tech support said my PCM and throttle body are fine, that the #1 cause of the Edge tuner causing the issues described is a poor connection between between the PCM and one of its connections. He advised to unplug, check, and clean all contacts, then firmly replug. He also said to always disconnect the battery before unplugging the PCM, most especially with a tune. This makes complete and perfect sense to me, but is something I often forget to do, as this is the only vehicle I've ever owned that removing the PCM is required to complete routine maintenance (plugs, COPs), as all my others are up under the dash or in kick panels.

Later this week I'll be replacing all COPs, so I'll have good opportunity to remove and inspect the PCM connections... starting to chase random misfires and lean codes, and after 13k on Autozone COPs, it's time for a full set of Motorcrafts, as I suspect the Autozone COPs of soft failures now that temperatures are warming, so I'll eat crow on my previous stance of using them due to the warranty. That Autozone purchase was borne of necessity and can now be corrected.

 

i'm changing my coils in the near future as well. i also just put on an edge evo about 2 weeks ago. was wondering how to go about it as well.
initial thought was keeping it as safe as possible by
returning it to stock on the edge
disconnect the battery
change the coils
reconnect the battery
cycle the truck on stock mode for a few days for the computer to learn the routine
then reprogramming with the edge again
this thread was a good read for me at the right time

as far as limp mode, i too went through that about a year ago with no edge programmer then
i did follow the steps and cleaned my tb, which made it a little better but without success. in my case the tb actually did go bad and i had to get another one which upon install worked right away.
i find it weird , in your case, for the codes to be thrown off right after you "I'd pulled the PCM to check the coils on the passenger side". and just plugged everything back in after?
considering i am a rookie to some extent, what exactly did you do? unplugged the edge? or unplugged the actual computer? then unplugged coils to visually inspect them or to electrically check them?

from the recent reading about the edge, once programmed, unplugging it will continue to run the last program installed. the edge does not physically need to be plugged in to operate under the last program inputted. the problem comes in if plugged or unplugged the truck computer gets re flashed somehow. either by a dealer after a service or possibly disconnecting the battery. not sure if the latter constitutes a re flash, although for sure it erases the short term data which i referenced above as "cycling the truck for a few days"

depending on what you unplugged and how you checked those coils on the passenger side.... some electrical gremlins could have attacked your tb somehow. for reference, my tb went out the morning after a huge rain , that somehow drained mostly on top of it causing it to be submerged under water up to the level of all the "maze walls" around it on the intake manifold. apparently this too is a common problem with our trucks. deteriorating windshield cowls cause water to be dumped right on top of our tbs' and the plastic maze walls around it can cause i'd say more then an inch of sitting water to be trapped there.

that's all i got...

 

I have had my ECU disconnected several times with my tune loaded and never had a problem.. Battery was disconnected prior to maintenance.

 

In my case, issues were only after messing with the Edge/PCM. I'll recheck connections at the PCM when I change all the COPs tomorrow and try a tune again, but if not, it'll be left in stock tune.

Throttle body received a cleaning a few months/thousand miles ago. Could it be on its way out, only having noticeable issues with different TB mapping from the different tunes? I supposed. Could soft misfires of the Autozone COPs become more pronounced with a higher performance tune, leading to limp mode? Also possibility. New COPs (which I'd planned to do anyway) and careful inspection of the PCM connections and we'll see, but I find it entirely too coincidental that the most recent time, the limp mode was caused simply from going from Level 2 to Custom Level 2 (changing only tire size).

I should have also mentioned (that I'd only just remembered): after removing the PCM for COP inspection the first time this happened, when I started the truck, there was NO display on the Edge, only a blank red-backlit screen with the crosshairs for the 4 quadrant display, but no numbers display. Restarting the truck solved that, only to have the trouble code appear, also leading me to believe a Tuner-PCM communication issue.

 

Once a Tune is loaded into the ECU.. you do not even need the Edge plugged in.. you can dis-connect it and put it in your glove box. Not required to be connected. It is not a connection problem with the Edge and OBII port.

 

Threw all Motorcraft coils on (runs the same, Duralasts for sale), and put a new TPS on... the mentioning earlier in this thread made me need to do it, as I also preventively replace sensors that have lived a life in salt air. As before, truck runs great in stock tune (after clearing capacitors and unhooked battery, still taking some time to "learn" to downshift 2 gears when I floor it... it's improving). After a 20 minute drive, I attempted to go to a level 1 tune... the Edge showed some error code (F1 perhaps?) with a message that went something to the effect of "that option is not supported with this unit." The screen then froze and was only resolved by unplugging from the ALDL.

Yeah, I'm going with the tuner's programming has been corrupted. Taking the bike NY-FL in 2 weeks in the back of the truck, not going to press the matter with the truck, I can sense when the universe is telling me to leave well enough alone.

 

tried the Diamondbird Mod and the truck seems to shift faster and responded better...after a couple of days mine was hesitating and wouldn't as easily downshift for passing or getting on expressways...I also noted (not a scientific conclusion ) that the truck needed two tries a few times to start...might as easily been me not holding the key long enough to start but there it is...

I have since done a OE type throttle body relearn and the truck this far has started as it should, seems to run like it should and always downshifts the transmission for passing or when I need it to...

Good luck with yours...

Bill