C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

ECM Change Issue

Old Oct 4, 2006 | 11:39 AM
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Default ECM Change Issue

I just replaced my ECM. My INST. Fuel mileage indicator now seems to change values faster, to lag changes in the engine speed/load, and to indicate far greater mileage.

The new ECM is the same service number as the old one (16159278) but tag said 1992 while my car is a 93.

Is this correctable?

Thanks in advance!!

Joe
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Old Oct 4, 2006 | 11:50 AM
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Did you keep the chip from your old ECM and put it in the new one?

Tom Piper
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Old Oct 4, 2006 | 12:13 PM
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Yes, I installed the PROM from my old ECM into the new unit. Apears to run great with no DIC codes.

Joe
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Old Oct 4, 2006 | 12:17 PM
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If you're speaking of the MPG average, it'll change more frequently when first reset. But the longer it goes, the more it will even out and changes will occur less frequently.
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