drake696

hey does any body here know if a 87 na engin will work with a 86 computer????

rico05

Yes. The same series engine will work with the same series ECU.

drake696

hey do u think if i have 86 ecu and 87 computer it might not be getting fuel through the fuel in the injectors cuz that is my problem

rico05

What do you mean by 87 computer? You mean CPU? No. The ECU controls the engine, the CPU controls blinker, lights, and horn, etc. The tow have nothing to do with each other.

HAILERS

There is only one hitch that might possibly throw you off track. The last half of the 87 batch of cars had HIGH IMPEDENCE INJECTORS. That meant that they do not require the solenoid resistor pack located a foot below the air filter/ air flow meter assy. Get your meter out and put the leads on the pins of one of the secondary injectors. They should read approx 2-3 ohms. If in fact they read 12 ohms, you will have to bypass the solenoid resistor package. Outside of the injectors being high or low impedence, I know of absolutly no reason for the car to not start. Exactly the same engines except for the above. Wadda you think???

HAILERS

Another thing to check for is spark. Why spark?? Because the ECU uses the input of the cas to inject fuel. No cas output, no fuel output. Thats my CRUDE understanding of the situation. I'd check the injectors as stated in my above post first. This post second. Also you might get your meter out and check the LEAD coil assy.The small white plug on it should have 12v on the black/yellow wire. If not check the fuses in the engine bay first, then the fuses near the left ankle of the driver. I think the relavent fuse is in the third or fourth row from the bottom, first or second fuse from the left. Heck, check 'em all while there.

drake696

well I'll definetly check it out but what i had to do is change the silanoids becous the 87's would not work with the 86 cpu soo I"ll try checking out the fuil in jector I still have the fuel in jectors from the 86 engin that was originally in there I also have 2 cpu's those are the computers on the passenger side right? see if i can get this beast running thanx alot guy and if u can think of anything else that can help please added some more info

HAILERS

I see just a small bit of confusion. The solenoid I was talking about is a set of resistors. They are located below the air filter assy and mounted on fender/frame. Its about six inches long and aluminium colored. Thats the solenoid resistor. Now the ECU are identical on the 86 and 87(at least on my 86 and 87). They have N326 written on them. Located under the passengers feet. Right now I stick with the different injectors as a good possibility. If you still have both cars you could look to see where the solenoid resistor pack is on the 86 and see if the 87 has one there also. If the 87 does not, then it had the high impedence injectors and if that engine is in your 86, its gonna be hard to start(pretty sure about that, never done it myself). I'll see if I can find a picture of it.

HAILERS

This sorry **** JPG is the best one I could find. You almost have to remove the airfilter box and afm to see it below them. REMEMBER THIS. It could be a totally different thing wrong with your car. No guarantees. Just a reasonable guess. Your there, I'm here, the cars there.

Amur_

Hailers, you rock (as usual.)

Just wanted to add that I've owned/driven 2 '86s, one after the other, with the same 87 NA rebuild, without trouble. And, yup, both the CPUs and ECUs in both 86s were the factory originals. Never had anything happen to suggest that the electronics were squabbling.

ttyl,
Amur_

HAILERS

I see something that was not made clear. The CPU is on the drivers side and has not a thing to do with the engine running. The ECU is on the passengers side, under the rug, near the foot area, and under a thin steel plate. You probably know that, but I saw you other post and the bit about the battery and the CPU.