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ECM Replacement ECM Replacement
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Old 08-14-2010, 11:22 pm   #1
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Paul what is the percentage of C4s would you say you had to replace the ECM and what years?
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Old 08-15-2010, 01:14 am   #2
 
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A HIGH number of early ones, including mine. Have you verified yours is bad?

Be sure to properly install both the CalPak and the ECM program chip and be sure to mount and ground it properly, or you'll simply go into a loop.
1985 Z51 4+3 trans rebuilt 5.7 TPI,(.10 over) w/ CompCams 12-262-4, 52MM Throttlebody, underdrive pulleys, reworked heads, Hypertech Thermomaster chip, & cat back exhaust
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Old 08-16-2010, 09:45 am   #3
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Chuck what was the reason for your change?
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Old 08-16-2010, 12:53 pm   #4
 
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There was a short of some manner we traced to the box. I believe it was blamed on poor soldering in the manufacturing process at the time. A buddy at dealership scored me a new ECM box for $96, so I jumped.
1985 Z51 4+3 trans rebuilt 5.7 TPI,(.10 over) w/ CompCams 12-262-4, 52MM Throttlebody, underdrive pulleys, reworked heads, Hypertech Thermomaster chip, & cat back exhaust
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Old 08-16-2010, 06:16 pm   #5
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Sounds like a great buy!
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Old 08-17-2010, 01:05 am   #6
 
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About three years ago, so if you have a friend at a dealership--great! Bet they still have a few around the country collecting dust.

If not, plenty of rebuilt units out there.
1985 Z51 4+3 trans rebuilt 5.7 TPI,(.10 over) w/ CompCams 12-262-4, 52MM Throttlebody, underdrive pulleys, reworked heads, Hypertech Thermomaster chip, & cat back exhaust
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Old 08-17-2010, 07:42 am   #7
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HI there,

There are so many different ones for different years.

I know personally, I have done all from 84-96, although the 94-96 much less frequently.

Yes, there are many cores out there.

Allthebest, c4c5
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Old 08-17-2010, 09:39 pm   #8
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Thanks Paul see you at Carlisle.
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Old 08-17-2010, 10:51 pm   #9
 
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Bright side? Yours is WAY easier to get to than Early C4s.
1985 Z51 4+3 trans rebuilt 5.7 TPI,(.10 over) w/ CompCams 12-262-4, 52MM Throttlebody, underdrive pulleys, reworked heads, Hypertech Thermomaster chip, & cat back exhaust
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