Hi guys - I'm new to the site and have a question. I have the SCT 9100 tuner and presently have the performance program installed. I have a 75mm throtle body that I would like to install (w/ port and polish intake elbo). Before disconnecting the battery should I return the PCM to stock or is it OK to leave the performance program on? Mike Troyer already created the program to account for the 75mm TB. Just not sure if I should return to stock b4 the install b/c I will be letting someone else turn the wrenches. Any advice is appreciated.

Thanks,
Mike

2003 SuperCrew
5.4L
K&N Series 77 HFIK
Flowmaster Force II Cat-back

 

I would not. leave the 9100 on there that way when the 75mm goes on the truck will run. with stock tune you would think that the new TB would make it run rough until you load the tuner.
just my thoughts

 

I would leave the program installed also. The truck will be running lean until you reload the program. Just my 2 cents.

 

Thanks Guys! That's what I was thinking.

 

Hi 03,

No, you don't need to return it back to stock tuning first when disconnecting the battery - not at all. Just leave your performance tuning in there & it'll be fine.

I *do* recommend making sure that any time you are either disconnecting or reconnecting the battery, make certain your ignition keys are out of the ignition - don't just turn the ignition off and leave he keys in the ignition - REMOVE the keys from the ignition. That way you can't fry the chip in the key with a current surge.

It doesn't matter what program is installed in your PCM, you can disconnect & reconnect the battery at will just as long as your keys are out of the ignition. That isn't going to cause you to lose the programming in the PCM, it just clears out the adaptive strategy adjustments & you go back thru the relearn cycle again.

Have fun!

 

Hi Mike - Thanks for the information. I do have another question.
I was running the diagnostics with the 9100 and recieved a code of P0230 Fuel Pump Primary Circuit Malfunction. I did get this DTC when I had the fuel pump fuse removed. I cleared the DTC's and put the fuse back in and ran the diagnostics again and got the same code. I'm still running the 94 performance tune and the truck runs great with no (SES) lights. If there actually was a problem with the fuel pump circuit wouldn't the (SES) light be on all the time and the performance suffer considerably?

Thanks in advance for your input!

Mike H.