ECU swap question

El_supracabra · 03-29-2011, 02:01 PM

i have a question....Im getting ready to swap out my old ECU due to the "unfixable mystery problem" (elimination of variables etc..)

and i was wondering...I have an 86.5 supra, but i think my new ECU is out of an 88. Im pretty sure the injectors in the 88 were "high impedence" and my 86.5 were "low impedence". Is this going to be a deal breaker??

Thanks guys!! (first time supra owner)

Conga1991 · 03-29-2011, 03:16 PM

I'm assuming your supra is non-turbo, any ecu of a pre-89 will work on any pre-89 wiring harness as well as post-89 ecu will work on post-89 wiring harness. but it's better to match up the same years. Also, im not sure about the injectors low impedance. Im pretty sure they are the same, but would be interested to know.

El_supracabra · 03-29-2011, 03:29 PM

thanks for the reply congo, screw it i say, im headed out the door to plug this baby in and see if she works! hahaha

wish me luck!

El_supracabra · 03-29-2011, 04:11 PM

well i installed the new ECU and its doing the same EXACT thing......

crap.

cre · 03-29-2011, 06:13 PM

For the benefit of the next person asking: The change to high impedance was with the '89 model and up. The low impedance (88 and earlier) had yellow tops; The high impedance (89 and up) had green tops. You can run high impedance injectors on a pre89 MKIII by bypassing the injector relay; You cannot run low impedance injectors on a 89+ (not by just adding the resistor).

03-29-2011, 02:01 PM	#1
El_supracabra Intake Join Date: Feb 2011 Location: South of Columbus, Ohio Posts: 45	ECU swap question i have a question....Im getting ready to swap out my old ECU due to the "unfixable mystery problem" (elimination of variables etc..) and i was wondering...I have an 86.5 supra, but i think my new ECU is out of an 88. Im pretty sure the injectors in the 88 were "high impedence" and my 86.5 were "low impedence". Is this going to be a deal breaker?? Thanks guys!! (first time supra owner) __________________ 86.5 Supra NA: milled head .020, decked block .007, .5mm+ pistons, port & polished intake manifold and cyl head,OBX header, 3-angle, cold air intake, Cometic MLS HG. ALL NATURAL! CHEVROLET- Cracked Heads, Every Valve Rattles, Oil Leaks Every Time FORD- Flipped Over, Rebuilt Dodge DODGE- Dirty Old Dust Gathering Engine I'd rather drive a Toyota, than push a ford.

03-29-2011, 03:29 PM	#3
El_supracabra Intake Join Date: Feb 2011 Location: South of Columbus, Ohio Posts: 45	thanks for the reply congo, screw it i say, im headed out the door to plug this baby in and see if she works! hahaha wish me luck! __________________ 86.5 Supra NA: milled head .020, decked block .007, .5mm+ pistons, port & polished intake manifold and cyl head,OBX header, 3-angle, cold air intake, Cometic MLS HG. ALL NATURAL! CHEVROLET- Cracked Heads, Every Valve Rattles, Oil Leaks Every Time FORD- Flipped Over, Rebuilt Dodge DODGE- Dirty Old Dust Gathering Engine I'd rather drive a Toyota, than push a ford.

03-29-2011, 04:11 PM	#4
El_supracabra Intake Join Date: Feb 2011 Location: South of Columbus, Ohio Posts: 45	well i installed the new ECU and its doing the same EXACT thing...... crap. __________________ 86.5 Supra NA: milled head .020, decked block .007, .5mm+ pistons, port & polished intake manifold and cyl head,OBX header, 3-angle, cold air intake, Cometic MLS HG. ALL NATURAL! CHEVROLET- Cracked Heads, Every Valve Rattles, Oil Leaks Every Time FORD- Flipped Over, Rebuilt Dodge DODGE- Dirty Old Dust Gathering Engine I'd rather drive a Toyota, than push a ford.

03-29-2011, 06:13 PM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	For the benefit of the next person asking: The change to high impedance was with the '89 model and up. The low impedance (88 and earlier) had yellow tops; The high impedance (89 and up) had green tops. You can run high impedance injectors on a pre89 MKIII by bypassing the injector relay; You cannot run low impedance injectors on a 89+ (not by just adding the resistor). __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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03-29-2011, 03:16 PM	#2
Conga1991 3" Exhaust Join Date: Jun 2009 Location: Avondale, AZ Posts: 169	I'm assuming your supra is non-turbo, any ecu of a pre-89 will work on any pre-89 wiring harness as well as post-89 ecu will work on post-89 wiring harness. but it's better to match up the same years. Also, im not sure about the injectors low impedance. Im pretty sure they are the same, but would be interested to know.