Got new 1226870 ecm, part numbers different...does it matter?
05-10-2008, 12:13 PM
#1
Member
Thread Starter
iTrader: (3)
Join Date: Sep 2006
Location: middletown ny
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1986 trans am, 1985 TRANS AM WS6
Engine: 305 4bbl,305 TPI
Transmission: 700r4,700R4
Axle/Gears: STOCK POSI DISC
Got new 1226870 ecm, part numbers different...does it matter?
swapped my 85 Ta tpi ecm today. the part #s on the boards and proms are different on both units. want to make sure this board isnt for a 6 cyl or a stick vehicle. It ran pretty rough when I plugged the new setup in.
Here are the differences:
Original ecm:
Board p/n 255001205745116
Prom: supertech p/n 11 522
small chip:16042431 2 8448
New ecm:
board p/n 255005106945050
prom: delco 9550 32500 E5012 U5G23057
small chip:16042431 2 8450
The car ran kinda rough with the ALL NEW ECM COMPONENTS.
I then switched the prom and chip from my original board onto the new one, and it ran better.
Does it make a difference in boards still being different #'s though?
Im assuming that supertech chip was programmed for my car originally differently than the new one is, so maybe this was the only problem?
The new ecm DID fix my main problem though:
The fuel pump was running CONSTANTLY instead of just priming for 2 seconds with key in RUN position, then shutting off.
THIS IS NOW GOOD!!!!!
I also checked for error codes with the new ecm, and my fan runs when the pins are jumped in the aldl cable now in test mode.
That NEVER happened with the original ecm. Is this ok?
I just dont wanna screw anything up again!!!
Thanks, Paul
Here are the differences:
Original ecm:
Board p/n 255001205745116
Prom: supertech p/n 11 522
small chip:16042431 2 8448
New ecm:
board p/n 255005106945050
prom: delco 9550 32500 E5012 U5G23057
small chip:16042431 2 8450
The car ran kinda rough with the ALL NEW ECM COMPONENTS.
I then switched the prom and chip from my original board onto the new one, and it ran better.
Does it make a difference in boards still being different #'s though?
Im assuming that supertech chip was programmed for my car originally differently than the new one is, so maybe this was the only problem?
The new ecm DID fix my main problem though:
The fuel pump was running CONSTANTLY instead of just priming for 2 seconds with key in RUN position, then shutting off.
THIS IS NOW GOOD!!!!!
I also checked for error codes with the new ecm, and my fan runs when the pins are jumped in the aldl cable now in test mode.
That NEVER happened with the original ecm. Is this ok?
I just dont wanna screw anything up again!!!
Thanks, Paul
05-11-2008, 09:17 PM
#3
Member
Thread Starter
iTrader: (3)
Join Date: Sep 2006
Location: middletown ny
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1986 trans am, 1985 TRANS AM WS6
Engine: 305 4bbl,305 TPI
Transmission: 700r4,700R4
Axle/Gears: STOCK POSI DISC
Re: Got new 1226870 ecm, part numbers different...does it matter?
Thanks z 28 jari.
Im glad that its ok for the fan to run, seems strange though. Is this normal for it to change (fan running) with different ecms?
I also have tried to search the boards and google for these board and prom numbers, and can't find any info.
I cant find anything on supertech proms either.
I also cant find a burnoff module or connector ANYWHERE under the dash.
Does anyone know if this new ecm board would still function in my setup even if it IS for a 6 cyl. or stick vehicle (after i swapped the prom to my original) Some of the resistors and the varistor colors are different too.
Is it possible that they are the same, but GM may have used different vendors for board components????
Also:
What does the little chip next to the prom operate?
Thanks, guys.
Im glad that its ok for the fan to run, seems strange though. Is this normal for it to change (fan running) with different ecms?
I also have tried to search the boards and google for these board and prom numbers, and can't find any info.
I cant find anything on supertech proms either.
I also cant find a burnoff module or connector ANYWHERE under the dash.
Does anyone know if this new ecm board would still function in my setup even if it IS for a 6 cyl. or stick vehicle (after i swapped the prom to my original) Some of the resistors and the varistor colors are different too.
Is it possible that they are the same, but GM may have used different vendors for board components????
Also:
What does the little chip next to the prom operate?
Thanks, guys.
05-11-2008, 10:01 PM
#4
Supreme Member
iTrader: (13)
Join Date: Sep 2005
Location: Bellville,Texas
Posts: 1,245
Likes: 0
Received 26 Likes
on
22 Posts
Car: 1985 Iroc-Z
Engine: 440LSX
Transmission: l460e
Axle/Gears: 3.55 Wavetrac
Re: Got new 1226870 ecm, part numbers different...does it matter?
Have a 85 Iroc-Z 305/TPI and when you pin the aldl the fan always comes on. Had the car since new, always has done that.
05-11-2008, 10:54 PM
#5
Member
Thread Starter
iTrader: (3)
Join Date: Sep 2006
Location: middletown ny
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1986 trans am, 1985 TRANS AM WS6
Engine: 305 4bbl,305 TPI
Transmission: 700r4,700R4
Axle/Gears: STOCK POSI DISC
Re: Got new 1226870 ecm, part numbers different...does it matter?
Good to know..... mine wasnt funtioning properly since I owned the car then !
05-13-2008, 05:40 PM
#6
Member
Thread Starter
iTrader: (3)
Join Date: Sep 2006
Location: middletown ny
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1986 trans am, 1985 TRANS AM WS6
Engine: 305 4bbl,305 TPI
Transmission: 700r4,700R4
Axle/Gears: STOCK POSI DISC
Re: Got new 1226870 ecm, part numbers different...does it matter?
Does anyone know the answers to my ecm matching ?
Please????
Please????
Thread
Thread Starter
Forum
Replies
Last Post
1992 Trans Am
History / Originality
27
05-10-2023 07:19 PM
IrocZ'85
Engine/Drivetrain/Suspension Parts for Sale
0
08-17-2015 06:24 PM
