is there anyway to retard timing manually? what im getting at is i know if you put a 4.7k ohm resistor in the IAT sensor you can increase timing as much as 1.5 to 2 degrees. can a different resistor be used to retard the timing??

 

Yep, sure can. Check out the links section of my web site, couple schematics on how to and what resistor.
Robert