Alright got everything togther, but it doesn't get any spark, it buzzes, all the idiot light are on, and the code checker that i made stays lite instead of going off in three seconds. I tried another ECU but same thing. Does anyone have an idea?

 

check the codes,

could be 100 different things... an unplugged AFM, an unplugged CAS, etc etc etc

 

I just found out a short is blowing a fuse. now to find out which one it is.

 

nevermind that was an illum fuse. How different are the S4 and 5 wiring harness? I have S4 high impendence injectors with a S4 harness and ecu but for some reason it seems like it all doesn't work together. When i turn the CAS it doesnt spark either.

 

Also the harness doesn't have the plug for the resistor pack.

 

I'm wondering if you have the code lamps installed properly, specifically the terminals positioned the right way on the plug in the engine bay.

Does she still do the same thing with that circuit disconnected?

 

They worked when i was driving it acouple of months ago. And i know its getting fuel and compression.

 

how could i test the ecu?

 

https://www.rx7club.com/showthread.p...leshooting+ECU

 

Took out the ECU and its a N332 18 881. But the harness doesn't have the plug for the resistor pack for the injectors so that means its an 88 Tii one right? SO this ecu won't work huh?

 

nobody?

 

If everything from your first post is still going on, yeah, a noncompatible ECU might be the place to start...

 

Doesn't the 881 mean it was reprogrammed? I thought they have like an R or something too.

 

Dude, I don't know about the reprogramming thing, but if I was you the first thing I'd do is install an ECU that's compatible with the harness you're using...

 

The 881 means it was a Mazda remand.

The N332 and N333 ECU will work without a glitch. High imp injectors were introduced in jun of 87.

Check the Ohm’s on the injectors if they are 2-3ohms you need the resistor pack in the harness.

Check the CAS with a continuity tester and see if it is good and within specs. If it is good and you are not getting spark. Check the coils. If still no spark bad ECU. I went through 4ECU's in my application before I got a good one.

S5 ECU has major differences. Avoid this if you can.

From your title I gather you have a turbo NA motor. If wrong please verify you swapped a TII motor and year. As well if you swapped any harnesses over. And if they are J-spec or A-spec

 

Somethings screwy here. A N332 is just fine and dandy. Even a N333, N327,N326 would work.

A 88 model car would have had high impedence injectors..........so I can't tie your remark about the solenoid resistor into what your doing. You had a 88 (no resistor pack) so why the remark about the resistor pack??????????????????

What's the talk about a series five harness if you have a 88????????????????? You should not be using a series five harness on a series four chassis.

You should not have had any problems if your car was a 88 non turbo and you just put a turbo engine in the car (with turbo ECU N332) and turbo boost/pressure sensor (even a na sensor will not keep it from starting and driving).

Just last week I took a turbo ECU, turbo pressure sensor, turbo afm and put it in a 86 non turbo and the car runs and drives just fine with no alterations to the harness. I use this as an example of swapability with the same series.

I suspect you put a series five emissions harness in your car and that is the real problem. Got me. If you did....ditch it and put your non turbo emissions harness in the car. Some minor alterations to the tps wire lengths required.

 

The S5 harness doesn't have the same plugs at the ecu though does it?

 

I just love it when you tinker with your cars for the good of the RX-7 community

 

No and it has other stuff. Just stay away from it and the S5 ECU.

 

Alright here is the whole shebang. I took a running 88 n/a and took both the intake manifolds off and installed Tii manifolds with the Tii high impendence 650's. Switched the whole drivetrain over and the front cover with baffle plate from my 87 Tii. Custom did the whole oil inlet for the turbo along with the coolant passages. Put an 88 Tii harness with ecu but for some reason it makes that buzzing like the coolant level on top of the radiator is not grounding but it is. I had the two led lights to check for codes and it worked before but now they just both stay on and there is no spark. woo thats alot.

 

Yup. They won't match. Rid yourself of it and put your series four emissions harness back in the car (pain in the ***). I think you'll find the tps harness will be a touch short so you can splice in extra length. Even a car without a tps will start and run.

By the way, it's best if you buy a series four turbo pressure sensor to go with the turbo ECU. The non turbo I believe it's been said is a 1bar sensor and the turbo a 2bar sensor. The deal is that at zero manifold pressure they put out different voltage to the ECU. It matters very much. Although the car will start with either, just not run very smart. So if you still have the non turbo pressure sensor, not to worry, the car should and will start and idle and even run up and down the street.

 

I forgot to mention, i did switch all the things i needed over. Put an FD pump, Tii pressure sensor, and have all emmissions removed.

 

Holy jesus lots of problems you have.
First no no need for the harness put your N/A one on.
TII injectors are 550cc
Your intake manifol is a 4port manifol and the NA is a 6port so major issues here that need immediate attention.

Edit: I would go back to the N/A ECU and use a SAFC at the least. Do not run it without a fule controller! Well unless you feel like tearing the motor apart.

 

**********Alright here is the whole shebang***********


About the 88 harness and ECU. The ECU should be a N333. Even a N332 or the non turbo would give you spark and let the engine run.

When I say emissions harness, I mean just that. The harness that runs from the fuel injectors, around the engine to the right fender, thru the hole in the bulkhead and to the ECU (plus a couple more plugs in the right passengers side)

IF that is the ONLY harness that has been changed, then I'd pull the small plug off the ECU and put a meter on the two sockets on the HARNESS PLUG on the far left and see if you get battery voltage with the key to ON.

 

I mean't 550s. my bad. THe manifolds were port matched. The emmission harness was the only one changed. I'll try that in the morning. Is there anything else i should look for. I would like this thing to at least start up.