Service Engine Light and No Code????

[GSP]

99 GT, auto, ceramic long tubes, new primary 02s

Off rode H, no egr, predator tune with egr off, secondary 02 off, mil off.

Been running this setup over a year and no Service Engine Light.

Now, Service Engine Light is on,,,, no codes,,, driven over 10 drive cycles and 100 miles,,, light on and no codes,,,

What is the deal?

 

[Coreyned]

im not too sure about this but maybe the ignition timing is set too advanced or too retarded?

 

[lazerred02]

99 GT, auto

Off rode H, no egr, predator tune with egr off, secondary 02 off, mil off.

Been running this setup over a year and no Service Engine Light.

Now, Service Engine Light is on,,,, no codes,,, driven over 10 drive cycles and 100 miles,,, light on and no codes,,,

What is the deal?

Just use the Predator and clear the code (even though there is not a code just go thru the steps like you were clearing one) get at least 3 good distance drives in and see if it pops back on.