The Revs/Mile for 275/40/17's should be set at 813. This is the rounded figure and obtained via Ford's formula.

Revs per mile = 20850 / { (2 * 275 * 40) / 2540] + 17 } = 812.504 which rounds up to 813.

Once you have that dialed in, don't change the revs per mile on the tires, and adjust the gear ...

List all of your available tunes. You may have one for high octane and automatic transmission performance. If so, you can run that one and turn down the timing several degrees. This would typically be 1 degree for every octane point. That will give you the firm shifts you want and the lower timing ...

Check the TPS voltage and verify that it is the proper range. You can adjust it by turning the hex screw that is on the top driver side of the throttle body. Google for the procedure and proper range of the voltage.

Try this one:

https://www.fleet.ford.com/maintenance/owners_manuals/

The fan settings are changed with the tune for better performance, so that is normal. There are a lot of changes within the tune if the car was running the factory tune before you loaded the 91 tune. You should be able to change the Miles to Km from inside the car without the tuner. Look it up in ...

Uncle Ben?

+1 Only tune for higher octane if you are running higher octane fuel.

The best thing to do at this point is to start using 91 or higher octane fuel, tune for 87 Performance and buy the CAI kit. You'll run a bit rich, but the car should run fine. Once you install the kit, start running the ...

Try the stock MAF sensor. The only other thing I can think of is the Charge Motion Control Plates are not opening, but I would think that would throw a code if that was the case. Not sure about the splice wiring you are talking about, but that could cause bad voltage/metering. Try to return ...

Wives' tale for sure... truth is higher octane burns cleaner ... and a clean engine is a happy driver.

If I were you, I'd tune to stock until speaking with them. You will be running excessively rich without modifying the tune. They will give you a heads up.

The other approach would be to tune by ...

Try cleaning the MAF sensor. Look it up, and be delicate with your technique. Aftermarket cotton/oil filters can gum it up if over-oiled...

Do you have your Traction Control on? What is the measured throttle angle?

I just checked one of my logs, and in first gear, not spinning I got 178.1 g/s at about 4150 rpm. This was with the measured throttle wide open 100%.

When shifting from 2nd to 3rd with the Traction Control engaging it hit ...

The tune is expecting the CAI kit to be installed as well. You're running too rich, and that's why the car runs rough with the performance tunes. You will need to get the CAI from C&L to run any of the tunes, or modify the tune you install.

Call C&L and they should be able to tell you how much to ...

Thanks Mike.

So if I add an Off-Road mid-pipe, which out of the three should be set to OFF to keep the car running right and not show the CEL?

Thanks again!!!

What are these settings under OBDII for?

I guess they are ON by factory, but what are they used for?

Maybe an Off-road H/X-pipe? ...and why 3 settings???

Please give me a senario where each would be changed.

Thanks.

Trick is to turn off the radio before turning the car off, unfortunately.