[mwebb]

Originally Posted by greenkz

ive been using a fixed value resistor ( 203*) instead of the iat sensor for about 8 months with no ill effects. im currently running it at 248* for this tankful to see what i get.

no ill effects ?
you mean except for the 27.22 mpg on a 2000 saturn sl1 of course .

the problem with this line of thinking is the first hint of an ill effect caused by tampering with the ignition timing map is a burned valve causing misfire on the offending cylinder -

the ECM does not see resistance , it sees voltage , a slight increase in voltage drop on the ground side will allow the IAT to report a slightly skewed colder temp while maintaining the ability of the IAT to influence the ECM according to air temperature ,
a much more desirable way to tamper IF YOU MUST Tamper with that which you have no knowledge of .