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XfireZ51 · 05-07-2013

Lee,

A 90 won't run very well w an EPROM using a 91 calibration. Must be same BCC for that year car. Now it will run in any year ECM however. One other issue w the 90 prom is the knock filter on board later year chips while 90 is external.

05-07-2013	#38
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,685	Re: DIS Failure symptoms? Lee, A 90 won't run very well w an EPROM using a 91 calibration. Must be same BCC for that year car. Now it will run in any year ECM however. One other issue w the 90 prom is the knock filter on board later year chips while 90 is external.