If I look for an ECU at a salvage yard - what do I need?
1989 GTA Trans Am - 5.7 - automatic

My car suddenly has the SES light on, and throwing 8 different codes. Car and ECU are well grounded.

As you have already been told in other posts
The memcal fitted inside is what determines the application ; Not the ECM itself

Need a ECM # 1227165
( a reman '165 ECM may have # 16198259 or 16198445 )

'165 ECM used in many different vehicles
Some listed
ASTRO 87-90 (2.5L)

BLAZER S10/JIMMY S15 87-88 (2.5L)

BLAZER S10/JIMMY S15 91 4.3L


CAMARO 86-89 (5.0L), EFI

CAMARO 87-89 (5.7L)


CAVALIER 86 ECM Cont (less PROM); 4-121 (2.0L), MT

CIMARRON 86 ECM Cont (less PROM); 4-121 (2.0L), MT

CORVETTE 86-89 ECM Cont (less PROM)

FIREBIRD 86-87 ECM Cont (less PROM); 8-305 (5.0L), EFI

FIREBIRD 87-89 ECM Cont (less PROM); 8-350 (5.7L)

FIREBIRD 88-89 ECM Cont (less PROM); 8-305 (5.0L), MFI

FIRENZA 86 ECM Cont (less PROM); 4-121 (2.0L), MT

S10/S15/SONOMA 87-91 ECM Cont (less PROM); 4-151 (2.5L)

S10/S15/SONOMA 91 ECM Cont (less PROM); 6-262 (4.3L), ID 1227165

SAFARI (GMC) 87-90 ECM Cont (less PROM); 4-151 (2.5L)

SKYHAWK 86 ECM Cont (less PROM); 4-121 (2.0L), MT

SUNBIRD 86 ECM Cont (less PROM); 4-121 (2.0L), MT

So... I should try a new MEMCAL? NOT the ECU?

Got find the right one for your car 1st

This 3rd Gen member can help you out with a memcal

https://www.thirdgen.org/forums/post...781-post4.html