Is Vendor Steering Me Correctly?
Thread Starter
Cruising
Joined: Sep 2020
Posts: 12
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From: Houston, TX (metro area)
Is Vendor Steering Me Correctly?
Hey team. First time post so please be gentle with me. I am seeking an ECU for my 1989 C4 with auto transmission. To my surprise, I found one that was "In Stock" and so excited that I immediately jumped on it. After I placed the order I started looking at the details (yeah, I know, kinda backwards) and noticed that it says that it replaces OE part #1227747. I have not yet pulled my existing ECU but everything that I have read seems to indicate that my part number should be 1227165. From what I could tell, it seems like the 1227747 is for manual transmission cars not for my automatic. I called back to the vendor and he did some checking and came back and said that "yes" his part W0133-2204705 (1227747) was a match for part number 1227165. I am still skeptical. Are there any ECU gurus out there that can clarify for me? Many thanks in advance.
Melting Slicks
Joined: May 2014
Posts: 2,895
Likes: 592
From: New Port Richey FL
A brief slide around on internet of the part #1227747 came back as pick-up truck and Astro Van so I'm sorry to say it to makes me nervous and not your part, My local supplier that I use shows this
https://corvetteparts.com/item/rebui...6-1989#details
. Ebay shows some and I'm sure Mirrock will probably have one used
Rock even is showing a limited number of them
AUTO zone even sell them
https://corvetteparts.com/item/rebui...6-1989#details
. Ebay shows some and I'm sure Mirrock will probably have one used
Rock even is showing a limited number of them
AUTO zone even sell them
Last edited by s carter; Oct 12, 2020 at 09:58 PM.
Drifting
Joined: Apr 2020
Posts: 1,925
Likes: 610
From: Orange, CA
http://www.gearhead-efi.com/Fuel-Inj...Information-42
This ECM was used in 1987 to 1991 C/K Truck, Van, 4.3L, 5.7L, 5.0L & 7.4L engines.
http://www.gearhead-efi.com/Fuel-Inj...Information-6E
1989 Y & F CAR 5.0L & 5.7L
They're totally different ECMs. I can find nothing to suggest that you can use the code from 1227165 on 1227747.
This ECM was used in 1987 to 1991 C/K Truck, Van, 4.3L, 5.7L, 5.0L & 7.4L engines.
http://www.gearhead-efi.com/Fuel-Inj...Information-6E
1989 Y & F CAR 5.0L & 5.7L
They're totally different ECMs. I can find nothing to suggest that you can use the code from 1227165 on 1227747.
Drifting
Joined: Apr 2020
Posts: 1,925
Likes: 610
From: Orange, CA
But it's not true outside of the Corvette, which is where the problem lies.
Also, for OP, did you really need to buy a new ECU? SIA Electronics can professionally repair your existing ECU if you have one, and that's the route I'd go, personally.
Last edited by Nomake Wan; Oct 12, 2020 at 10:04 PM.
Thread Starter
Cruising
Joined: Sep 2020
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From: Houston, TX (metro area)
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Thread Starter
Cruising
Joined: Sep 2020
Posts: 12
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From: Houston, TX (metro area)
This is true for the Corvette, yes. The physical computer on the Corvette is the same between 86-89, and all 86-88 can be updated to 89 code by altering the code on the MEMCAL and making a few other minor changes.
But it's not true outside of the Corvette, which is where the problem lies.
Also, for OP, did you really need to buy a new ECU? SIA Electronics can professionally repair your existing ECU if you have one, and that's the route I'd go, personally.
But it's not true outside of the Corvette, which is where the problem lies.
Also, for OP, did you really need to buy a new ECU? SIA Electronics can professionally repair your existing ECU if you have one, and that's the route I'd go, personally.
Thread Starter
Cruising
Joined: Sep 2020
Posts: 12
Likes: 0
From: Houston, TX (metro area)
This is true for the Corvette, yes. The physical computer on the Corvette is the same between 86-89, and all 86-88 can be updated to 89 code by altering the code on the MEMCAL and making a few other minor changes.
But it's not true outside of the Corvette, which is where the problem lies.
Also, for OP, did you really need to buy a new ECU? SIA Electronics can professionally repair your existing ECU if you have one, and that's the route I'd go, personally.
But it's not true outside of the Corvette, which is where the problem lies.
Also, for OP, did you really need to buy a new ECU? SIA Electronics can professionally repair your existing ECU if you have one, and that's the route I'd go, personally.
Pro
Joined: Aug 2020
Posts: 647
Likes: 126
From: Liliha Bakery stuffing my face with coco puffs!
Thanks, Nomake Wan. I kinda want a spare. It seems that these ECM's are becoming scarce. I just got this '89 but it only has 16K miles so I hope to keep it a while. Right now it has an ignition issue that I would like to see if the ECM fixes and then keep the original as a backup. The previous owner had tried several fixes for the long cranking time on start up and the shop that I took it to tried a few more things but concluded that it was likely the ECM. I hate to just throw parts at it but I thought it would be nice to have that spare anyway.
This is one for the dart board...is the memcal stock for your 1 year cold start injector delete?
My '90 seemed to do the same and was attributed to having Bosch III injectors. Changing the battery offsets in the tune seemed to make it worse so I increased the frequency of crank multiplier in the tune. YMMV
Thread Starter
Cruising
Joined: Sep 2020
Posts: 12
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From: Houston, TX (metro area)
Definitely 1227747 is a truck TBI ECM. ^^^Did you check that your fuel pump relay is working? If the fuel pump relay is bad, your fuel pump won't turn on until the ECM sees oil pressure.
This is one for the dart board...is the memcal stock for your 1 year cold start injector delete?
My '90 seemed to do the same and was attributed to having Bosch III injectors. Changing the battery offsets in the tune seemed to make it worse so I increased the frequency of crank multiplier in the tune. YMMV
This is one for the dart board...is the memcal stock for your 1 year cold start injector delete?
My '90 seemed to do the same and was attributed to having Bosch III injectors. Changing the battery offsets in the tune seemed to make it worse so I increased the frequency of crank multiplier in the tune. YMMV
Drifting
Joined: Feb 2017
Posts: 1,274
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From: Tacoma WA
2024 C4 of the Year Finalist - Unmodified
You mention old gas! How old? If the car only has 2000 miles in 5 years that is a tank full a year. I would empty the tank, make sure the lines are clear, install a new filter and troubleshoot after that is taken out of the equation.
Thread Starter
Cruising
Joined: Sep 2020
Posts: 12
Likes: 0
From: Houston, TX (metro area)
Agreed, I think is the cheapest and simplest next step too. Thanks for taking time for me.