Resolved 1G need ecu question answered

[91gsxdsm]

i have searched and searched and searched and cannot find a definate answer. i have a 1990 n/t with a bad ecu (caps leaked). i had a 1990 awd that was wrecked. anyway i got the ecu out of the awd and was wondering whats different about the ecu's, i dont mean part numbers but actual difference. both are non eprom, seem to look like the circuit board is the same, whats different about they "data output" . ive tried plugging in the awd ecu into the n/t and the car would backfire some but never crank. the only thing ive seen is different pins but that seems to be when changing year models. is there anyway i can make this ecu work since its good, and i dont feel like spending money on a ecu for the n/t. the n/t has a good running motor but as i said a crappy ecu and i hate for the car not to be running when all it is , is a minor fix. What can i do to make this ecu work? im not going to convert it to boost etc . but is the fuel different. i know the injector size is different.
edit: both are 2.0 6 bolt

 

[cantrun10s]

NT runs different fuel pressure, different injector size, different compression, alot of differences. Your GSX ECU will not dump enough fuel for a N/T car. As for converting it.... go to a junkyard, get a 1g N/T ECU, if it's 91-94 swap two wires, if it's out of a 90, plug and play.

Way less painless IMO than trying to use the GSX computer.

EDIT - why not just fix the N/T one you have? Caps can be replaced, bridges can be made, etc. etc.

 

[91gsxdsm]

i have no idea how to fix the old one. what site can i find on fixing it, . ive been to every pick and pull locally and cannot find a ecu, and everwhere online wants over 150$ for one and i refuse to spend that .

 

[cantrun10s]

Theres a few company's that will fix them.

My recommendation is Steve

But 150 is a pretty fair price.... Maybe sell your GSX computer to cover the cost?

Edit again - I know for a fact my local pick and pull has at least 4 1g N/T ECU's. I'll check the price with them and let you know. I'll be there on Monday of next week anyway, I need to pick up some spare parts.

 

[91gsxdsm]

thanks, where you from? lemme know what they got and how much and ill see what we cant arrange

 

[turboglenn]

swap the plug wires to the opposite coils..mmitsu changed them back and forth every few years for some odd reason.

 

[91gsxdsm]

what wires are you talking about?

 

[steve]

swap the plug wires to the opposite coils..mmitsu changed them back and forth every few years for some odd reason.

Mitsubishi didn't change them. You'll note that the standard order of wires on the coils remained 4123 (left to right facing the coil towers) on all DOHC 4G63s, just like the firing order is always 1342.

The only time you swap the spark plug wires on the coils is to adjust for the change in the location and signal of the CAS between the engine and ECU. It's a 2G thing due to the fact the 95 ECU expects one thing and the later cars or those with 6 bolt swaps produce a different signal. Look up CAS inversion.

Back on topic.

There are several differences between the NT and Turbo ECUs. The most important is the software written into the CPU chip when it's made. Because of the different injectors, fuel pressure, static compression, and cams, the fuel and timing maps are very different. The NT engine doesn't have a Knock Sensor, Boost Control Solenoid, Fuel Pressure Solenoid, and the MAF is different. The drivers for these parts are missing from the NT circuit board. The NT uses high impedance injectors and the drive circuits for the injectors as different because of this. There are several other minor difference in parts and strapping between the two.

You should really get a good NT ECU for your car.

 

[brownfinger]

93 NT ecu's are only 65 bucks, for some wierd reason. It sounds to me like you'll have to swap pins 14 and 6 on the ecu harness. Try VFAQ Site - Visual Frequently Answered Questions for the cap replacement and the ecu pinout diagram. Call DSM graveyard for an ecu if you can't find one anywhere else. They are a listed vendor on this site.