S13 Rb20Det Conversion Starting Then Stalling

[#skyginer]

Gday everyone out there, just a quick one,

On a silvertop rb20 det theres a 6pin plug near the thermostat.

When i purchased the main loom it didnt have this section of loom. I wired 4 of the 6 pins to the 3 rear injectors but my question is

What are the other two wires for?

The colours are black and black/white trace

This is the plug

[#skyginer]

And the car has started, but the next day it didnt. Has fuel and spark. Runs on startyabastard but wont run anymore. Start wire pin 43 is wired when cranking. Im lost

[Dose Pipe Sutututu]

check my signature, I wrote this wiring diagram many moons ago when I rewired my S13 RB20DET

[jiffo]

Not sure if you're looking at the male or female plug, but checking the ground socket will clarify it.

Top left > Ground. (pin 50)

Top centre > Air reg.

Top right > Battery power. (pin 58)

Bottom left > INJ 5. (pin 110)

Bottom centre > INJ 4. (pin 112)

Bottom right > INJ 6. (pin 114)

You need to give a lot more detail of the problem to get decent feedback.

John and myself have done this job, it's not hard but there are some tricks.

Have a good read through John's DIY and if you're sure you have the wiring correctly then come back to us.

On a final note, make sure you've got your fuel supply and the return-to-tank lines the right way around.

That's a common one to be caught out on.

[#skyginer]

Cheers heaps jiffo.

Thanks for the wiring, where/whats the air reg? My idle control valve has a plug on it that is plugged in and I have wired the s13-rb20 using your guide johnnilicte previously. Thankyou

The issue is hard to describe, it gets good strong spark and fuel.

The fuel lines are plumbed the right way, it starts and fires but will not run. Like the injectors arent opening.

I tested pressure by opening one of the lines, and i tested the fpr by using a g clamp to progressively increase pressure to rule that out.

Is the ground in the plug an injector ground?

And where is it wired to?

Cheers for your help

[#skyginer]

Just re read your post jiffy, and checked a pinout, does that ground need to be Earthed to chassis or motor?

[jiffo]

The engine harness has multiple grounds.

From memory there's the pair beside the temp sensors, another on the igniter.

But when you strip back the harness you'll find they're all interconnected.

Pins 10, 20, 30, 50, 60, 107, 108, 115 and 116 are all grounds but if you pin them out (with the ecu plug disconnected) you'll find they're linked.

The air reg lives under the plenum. It's the cold/fast idle valve and really isn't needed in our climate as the AAC can control the engine perfectly.

When you get the car running you might consider blocking the hose to the air reg thus removing the high idle problem these older cars often get from a stuck open air reg.

If it starts then immediately stalls sounds like a big induction leak somewhere between AFM and throttle body.

You could disconnect the AFM plug and see if it will then run in limp mode.

Can you post a pic of your install, we might see something amiss.

[#skyginer]

Ok, so i just disconnected the iacv and blocked the air hoses. Disconnected the afm and now she runs thankyou, will check for induction leaks now :-)

[#skyginer]

Found a 1/2 inch hose had perished and leaked badly under the upper plenum. Repaired it, replumbed the iavc and it runs, but not with the afm plugged in, what do you think i should check?

[jiffo]

Grab a working known AFM from a mate and see if she goes.

You've isolated the fault to either the AFM, the wiring to the AFM or an induction leak.

The cheapest and easiest method of fault finding is to replace suspect items with known working examples.

Don't go buying bits until you're sure.

[Dose Pipe Sutututu]

** from past experience..

I had a similar issue when my injector seals were leaking and leaning out the mixture, it would start with the AFM disconnected but as soon as it was plugged back in the car wouldn't start (when warm this is).. I then removed all the injectors, got them ultrasoniced, popped on new rings, etc.. and guess what? She started like a dream!

Oh yeah, just re-read the post I didn't even take notice to what plug you were referring too.. (busy at work)..

[#skyginer]

No worries, my missus has a 33 gtst do they have the same afm? If so should i put mine in her car, or hers in my car?