Purchase ECM
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Pro
Joined: Jun 2018
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From: Louisville, Ky
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Purchase ECM
As you may know I'm having a real problem clearing a code 14 on my 85 Z51 Auto. I'm going to do some more checking and testing but the only thing left is to replace the ECM. So where is the best place to purchase one?
TIA,
Joe K
TIA,
Joe K
Drifting
Joined: Dec 2000
Posts: 1,785
Likes: 91
From: Leander TX
Good time to upgrade to the dynamic EFI or at least the 86+ computer. Fairly simple swap over. I've got my old ECM but the chip set was modified by TPIS to a different style prom or I'd offer it up to you. After a couple mail in tune tries to get my miniram ZZ4 swap running right I gave up and went dynamic EFI. Best thing I've done to the car since I bought it 23 years ago.
Last edited by 85WHITEZ51; Apr 27, 2021 at 11:12 AM.
Thread Starter
Pro
Joined: Jun 2018
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From: Louisville, Ky
2022 C4 of the Year Finalist - Unmodified
Finalist 2020 C4 of the Year - Unmodified
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Good time to upgrade to the dynamic EFI or at least the 86+ computer. Fairly simple swap over. I've got my old ECM but the chip set was modified by TPIS to a different style prom or I'd offer it up to you. After a couple mail in tune tries to get my miniram ZZ4 swap running right I gave up and went dynamic EFI. Best thing I've done to the car since I bought it 23 years ago.
Joe K
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From: Louisville, Ky
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No one has any opinion on the one's available from places such as Corvette Central, Eckler's, Zip and etc?
Joe K
Joe K
Melting Slicks
Joined: Jun 2011
Posts: 2,383
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From: Leland , North Carolina
Good time to upgrade to the dynamic EFI or at least the 86+ computer. Fairly simple swap over. I've got my old ECM but the chip set was modified by TPIS to a different style prom or I'd offer it up to you. After a couple mail in tune tries to get my miniram ZZ4 swap running right I gave up and went dynamic EFI. Best thing I've done to the car since I bought it 23 years ago.
By the way TPIS could never get my 408 cid built motor to run correct. It was a joke. After 3 proms the owner at Street & Performance burned me one and ran superb not one glitch for half the cost. Sadly he passed away and they closed up.
Last edited by TommyFox; Apr 27, 2021 at 04:53 PM.
Instructor
Joined: Oct 2018
Posts: 225
Likes: 81
From: Vancouver, WA
I bought a rebuilt ECM for my 85 Z51 (Blue Streak Electronics #ECC6870) from Autozone. They had it in stock. I did not end up needing to replace my ECM, so I cannot comment on quality. ( I kept it as a spare.) However, I bought a rebuilt Blue Streak Electronics MAF for my 85 and it works very well, and is a perfect match with all the burnoff circuitry.
Oreilly Auto has the Cardone rebuilt ECM (#77-6870) in stock as well. I have no experience with Cardone products.
I just checked on Rock Auto and they have both in stock (less than $100 + Core charge).
Oreilly Auto has the Cardone rebuilt ECM (#77-6870) in stock as well. I have no experience with Cardone products.
I just checked on Rock Auto and they have both in stock (less than $100 + Core charge).
Thread Starter
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Joined: Jun 2018
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From: Louisville, Ky
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I bought a rebuilt ECM for my 85 Z51 (Blue Streak Electronics #ECC6870) from Autozone. They had it in stock. I did not end up needing to replace my ECM, so I cannot comment on quality. ( I kept it as a spare.) However, I bought a rebuilt Blue Streak Electronics MAF for my 85 and it works very well, and is a perfect match with all the burnoff circuitry.
Oreilly Auto has the Cardone rebuilt ECM (#77-6870) in stock as well. I have no experience with Cardone products.
I just checked on Rock Auto and they have both in stock (less than $100 + Core charge).
Oreilly Auto has the Cardone rebuilt ECM (#77-6870) in stock as well. I have no experience with Cardone products.
I just checked on Rock Auto and they have both in stock (less than $100 + Core charge).
Joe K
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Team Owner
Joined: Sep 2003
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A few weeks ago a fellow '85 owner was very happy with his $60 buy off of eBay. That seller has raised his price to $75 now but it seems it's a 'satisfaction guaranteed' or money back!! I'd stick with your diagnostics and I didn't follow your post but there's much to think on. If you've got quality meter and understand diagnostics there's much to do before you buy a thing. You might just for the he!! of it reseat the PROM and calpak in what you've got. While doing that see if yours is original or a replacement already.
Racer
Joined: Feb 2020
Posts: 483
Likes: 109
From: Fairfax, Virginia
I have an 85 4+3 ECM sitting on a shelf I've been wanting to get rid of...
One thing to look at if you are of the electronic curios type, the pull-up resistor inside the ECM may have a cracked solder joint, I can walk you through checking it if you are interested.
I also thought my ECM was faulty, so I went standalone, but as it turns out 35+ year old wires aren't super robust, it was a harness issue the entire time.
One thing to look at if you are of the electronic curios type, the pull-up resistor inside the ECM may have a cracked solder joint, I can walk you through checking it if you are interested.
I also thought my ECM was faulty, so I went standalone, but as it turns out 35+ year old wires aren't super robust, it was a harness issue the entire time.
Last edited by ThatOneKid; Apr 27, 2021 at 09:42 PM.
Thread Starter
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From: Louisville, Ky
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Joe K
Racer
Joined: Jan 2013
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From: Cincinnati OH
I bought one from autozone like 8 years ago that worked for a while then stopped getting pulse to the injectors. Took it back on a warranty and got another one. It worked fine til i pulled everything for LS swap.
Racer
Joined: Feb 2020
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From: Fairfax, Virginia
Thread Starter
Pro
Joined: Jun 2018
Posts: 658
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From: Louisville, Ky
2022 C4 of the Year Finalist - Unmodified
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Ordered one from O'Reilly's should be here in the am. Will know something tomorrow night. Thanks for all of the help!
Joe K
Joe K
Last edited by Joe K; Apr 28, 2021 at 12:11 PM.
Drifting
Joined: Dec 2000
Posts: 1,785
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From: Leander TX
Did you stick with a MAF or go speed density? Growing weary of junk MAF sensors. I have a low mile used Bosch coming I hope this the last one for a while.
By the way TPIS could never get my 408 cid built motor to run correct. It was a joke. After 3 proms the owner at Street & Performance burned me one and ran superb not one glitch for half the cost. Sadly he passed away and they closed up.
By the way TPIS could never get my 408 cid built motor to run correct. It was a joke. After 3 proms the owner at Street & Performance burned me one and ran superb not one glitch for half the cost. Sadly he passed away and they closed up.
Thread Starter
Pro
Joined: Jun 2018
Posts: 658
Likes: 239
From: Louisville, Ky
2022 C4 of the Year Finalist - Unmodified
Finalist 2020 C4 of the Year - Unmodified
C4 of Year Finalist (appearance mods) 2019
Cardone ECM from O"Reilly's did the job. Running great! Thanks everyone!
Joe K
Joe K