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ChevyTech · 07-24-2009, 10:36 AM

Look at the ECM numbers.
The same ECMs where used for both engines for a number of years but the chips (Prom) would be different, but look at the numbers on the ECM. Depending on the vehicle and equipment some vehicles used a different ECM.

07-24-2009, 10:36 AM	#19
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,620	Re: 1990 Chevy 4x4 low speed miss Look at the ECM numbers. The same ECMs where used for both engines for a number of years but the chips (Prom) would be different, but look at the numbers on the ECM. Depending on the vehicle and equipment some vehicles used a different ECM.