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

ECM Question.

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Old Oct 12, 2006 | 10:32 AM
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Default ECM Question.

I am looking for a replacement ecm to use as a spare. I am wondering if a 1986 165 ecm is the same as a 1987 ecm? Anyone know?
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Old Oct 12, 2006 | 10:41 AM
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I believe they are, I don't think they changed until 88 or 89 when they did away with the CSV.
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Old Oct 12, 2006 | 01:18 PM
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Originally Posted by Pete K
I am looking for a replacement ecm to use as a spare. I am wondering if a 1986 165 ecm is the same as a 1987 ecm? Anyone know?
The ECM's are the same...just the memcal changed....
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Old Oct 12, 2006 | 02:00 PM
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Be sure and retain your PROM chip, too....
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Old Oct 12, 2006 | 05:05 PM
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late 80's s-10 , s-15 pick-ups with 4-bangers used the -165 ecm..toss the prom....
also f-body cars with tpi...all -165's are the same

Last edited by redrose; Oct 12, 2006 at 05:08 PM.
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Old Oct 12, 2006 | 05:40 PM
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Thanks for confirming it for me. I will buy the one listed in the for sale section.
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Old Oct 12, 2006 | 05:42 PM
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Originally Posted by onedef92
Be sure and retain your PROM chip, too....
The EPROM is on the Mem_Cal.
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Old Oct 12, 2006 | 10:34 PM
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Originally Posted by Pete K
I am looking for a replacement ecm to use as a spare. I am wondering if a 1986 165 ecm is the same as a 1987 ecm? Anyone know?
Yes, 86-89 will work. 89 being the better.
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