Here is my situation. My 99 smoked the tires from day one. Adding a chip just made it better. Life was good. Then came "the miss." Dealer got no bad codes to explain the miss so he believed chip damaged computer. He still replaced it without charge. Miss did not dissappear but I now "believe" that low end power did but was masked by the continuing miss. Later replacement of #4 plug & tightening of coolant hose fixed miss.
Now truck runs smooth as silk and will still kick when punched at speed but she will not even try to turn the tires over when stopped. Dealer called Ford & was told that maybe CUX2 was not matching up with 99 vehicle & old CUX1 programing should be restored. Dealer tried but claimed it was not possible saying this computer recognizes nothing but the updated program. I am sick. Why doesn't the engineer know the program cannot be reversed? Why doesn't the computer tell the dealer that a plug is so wet it's rusting & causing a miss? Why doesn't everyone know that a truck with 360+ horses & an empty bed should spin the tires? I would greatly appreciate any help or ideas any of you have on this. I want my old 99 back.

 

I think you got a detuned program...

 

Sounds like your dealer "cooled your jets" with a non-performance program in your computer. You said they replaced the computer, with no charge to you? Maybe they wanted to make sure they didn't have to replace it again. What happens with the chip back in?

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2001 Silver Bolt
Adopted 3/24/01
Red Line Water Wetter Wet Okole's Bedrug JL Ram Air

 

I have not reinstalled the chip because I don't believe it would work with the new program & I'm not through with this dealer yet. Detuning my truck is not the way to get rid of me.

 

There isn't any way to reprogram your pcm with the CUX1 program. You will need to get your chip reburned. Start looking for wrecked 99 L's and buy the old CUX1's off them. The only way to maintain the old codes.

Its a Bummer.

 

check your computer and see if they used one of these...

 

Andre is correct. You cannot get the CUX1 back into that PCM. Once Ford decides to update a calibration, the previous one no longer exisits. And if you buy a new PCM, it will still be a CUX2. And yes, you will need your chip reburned for the CUX2.

As for the "performance" difference between the two PCMs, there is not really much. Most of the calibration changes are emissions related. The fuel and spark stuff is all the same. The drivability may be a tad different, but the truck should perform the same.

I'm honestly really surprised that they didn't look for the coil problem first. That has been a very common problem on all F-150s, Expys and Navigators for a few years now.




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SAL - TEAM PSP

 

Sal

Interestingly I have experienced the same loss of off idle grunt after getting a miss fixed. All they did in my case was replace 8 plugs and 2 coil packs. What would cause the loss of jump off the line ?

If the demise of the plugs ( broken electrodes ) damaged the valves how would I know ?

Thanks in advance ....
Doug

 

Sal,
My 2001 L, will not smoke the meats from a dead stop either. All it will do is just barely sqeal the tires at launch. BUT, if I hold the brake, I can melt them to the ground. The truck is bone stock with 3000mi. What's up with that??????

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• 2001 Lightning (WHITE)
• 2001 SuperCrew (RED)
• '90 Pro Street Mustang GT 1/4 7.50ET@185MPH.
• '23T Altered 1/4 8.90ET@150MPH.
  2001Bolt@group1320.com

http://www.group1320.com

 

Well, I wasn't going to mention it in the other post, but 95% of all the trucks I've worked on, including my own 99, never smoked the tires from a standstill. Not even barely a squeal. It required some good powerbreaking for that to happen. A chip usually fixes that "problem" . But in nonsmokers case, his truck is obviously different from before. For him and Doug, if you had any kind of valve damage, it would probably show up as a miss at the least. But you can bring your truck to the dealer and have them to some tests with the SBDS or WDS, like power balance, relative compression, and some others that can pinpoint a power loss problem.

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SAL - TEAM PSP

 

This might sound stupid, but is there a tempature difference from then to now. I know that before when my truck was stock in the cold winter I could spin them all day, but in the heat of summer the truck, hooks up allot better and launches, it also runs a bit slower due to the heat. The heat could make all the difference in the world. when y intercooler went bad, it was empty once and the truck was a dog compared to before. Maybe check the intercooler also.

Just a few things that came to mind?!?!

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Built 5/4/99
# 917 of 4000
P.S. I DON'T CARE!!!!!!!

 

I have a hard time launching this thing with 150lbs in the bed!

 

The Paperwork says they did a relative compression test so.... I will take the old time approach of assuming it is fine and drive it till something tells be obviously it is not OK.

Thanks for your input Sal !!

Doug

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Picked up Silver 2000 Lightning 2/28/00!!
1st run 13.9 sec 1/4 !! Best Run 13.025
drbdkb@hotmail.com

www.SVTLightnings.com

2000 Lightning, FMS 3.73 gears ( Expensive ), PSP 4 Way Chip, PSP Intake, Valentine 1, Snuglid, Bedrug, Lighted Ford Logos, Superchip R9, and 3m Panther Black nickel tint, Clear corners., Boston Acoustics 5x7s and Components, Alpine v12 5 channel Amp and JL Sub, Chrome SVT Rims and G Force R1a Autocross Tires, .

 

Thank you all for your comments. But unless you have some mods, that last one was cruel.

 

My 2001 will turn the tires over & often shifts into 2nd gear still spinning, if nailed from a standstill.