I just mailed off the chip today so I hope to have some sort of feedback on it in the next week or two! F&$&%G computers man, and they're suppose to make our life better!

 

If it's not the tuner , try to reset the APPS. If you have a buddy with an extra APPS swap it out for a little bit and see if the same problem show's up on his.
JMO.

 

Ok, so I had about million things happen and this is where it is now. I took the truck to several outfits to diagnose and found my first problem. The data port under the dash was bad so we replaced it. Now we can communicate with the pcm. The pcm was not giving any codes. I then spoke with Superchips and they asked me to resend the programmer back to them. I sent it back and they updated it again because the first time we could not communicate. So I got it back and found out that the guys who installed my VP44 recently had un-installed the chip so I re-installed the chip and that only made the surge worse.

I then attempted to reset the APPS and that did not work. So I adjusted it from .499 to
.564 which the APPS states .567 that i replaced in Nov. of 08. I took it for a test spin and the surge seems to be gone finally!!!!!!!! I hope this will help fuel mileage as I was getting 20+ and now am right around 17 towing a small utility work trailer. I plan on cleaning the map sensor today then see what I got.

Does anyone know if I need to reset the APPS after this process or run it as is? I did get a check engine light and pulled the code for a voltage issue from the TPS and MAP sensor right when I left my driveway. I just deleted it and finished my test run and it has yet to happen again. Thanks

 

Sounds like you might have found your problem. Clean both your MAP and IAT sensors.

 

Opps... Now you might of screwed up... Did you check the idle validation switches for proper state???



This a FAILED proceedure... A lot of people I talk to trying to correct this find out they push the APPS to far and got the idle state switch wrong. Also they keep measuring the voltage at the PCM. PCM only controls trans and cruise control! The ECM controls the engine and fueling parmeters. Also this proceedure is only good for NEW APPS sensor. Trying to re-tune a old one usually results problems.

The other thing is to check the voltage again after a day of driving if the voltage keeps changing then the APPS is total wore out and you'll fight to hit the mark continuely.

 

The APPS is only 8 months old and I replaced it 4 months before the lift and injector pump went out. I would assume that it would not be worn out as of yet (it has better not for how much they are to replace)!!! This surge started right after I replaced the lift and injector pump which I am guessing are responding differently due to these new components.

After the last week of driving, the truck seems to be running good, no surge and no change in voltage readings as of yet. I am concerned that I screwed something up but I have not gotten another engine code. I am no expert, and I do not completely understand what your diagram is regarding the idle switch. Everything seems to be running smooth but a better explination would be greatly appreciated on this procedure or a website, etc. Thanks for the info!!!