I thought i remembered troyer recomending to pull a fuse when loading a tune using the XCAL2. Was it the maxi 19 fuse? I cant remember - just seeing if anybody knew real quick -

thanks!

 

Hi. No - check yer owner's manual - each model year appears slightly different - it should be the one in the under-hood dist box labelled as 'fuel pump' in the manual. Maxi ( 20 amp).

If you don't have an Owner Guide, you can download one from here: http://www.motorcraftservice.com/vdi...&menuIndex1=18

EDIT - ok, had a look at the 1998 guide - position #19 - Fuel Pump Relay - 20 amp (page 140 in the guide)

 

Thank you MGDFan!

I appreciate you taking the time to look that up i just wasn't sure which one to even look up. thank you very much! I dont wanna mess anything up ya know

 

what's the difference if you pull a fuse or not???? does it hurt the tune changes???

 

X2 Why would you need to pull a fuse?

 

From what I've seen most times you can get away with not pulling fuses. However most times when someone is having trouble programming, simply pulling a certain fuse can remedy the problem. The reason behind this is things like a fuel pump or satellite radio may activate and cause a drop in voltage large enough to interrupt the tuning process.

 

On a pre-04 trucks, there have been some cases of the fuel pump/injectors activating during the tuning process, which caused some spillage directly into the cylinders. Not common, but enough of a concern that SCT, Superchips, etc, put that boilerplate text into their documentation - more of a 'better safe-than -sorry' CYA thing. On the 04+'s this isn't a concern - different PCM architecture.

Apart from all of that - a fully charged battery and elimination of any non-essential loads by pulling fuses (eg. amps, lights, fans etc) is a very good practice to follow - you need to ensure that supply rail has adequate voltage - flashing is a relatively demanding process.

bubba