R32 Stalling, Very Annoying, Cant Find Fault!

[stimps]

The previous owner of this car really screwed things up, everything was fiddled with and left in wrong settings. I have slowly fixed everything up and have just a couple of things left to fix. The alternator was screwed, i repaired that, the steering was wrong, no horn, no auto indicator cancel, too low, hicas light on, suspension too low, engine stalling and cutting out, coils misfiring.so now ive fixed most things.

but this problem just persists....

Its a two door RB20DET manual R32 1993 model (imported from japan last year) Completely stock.

Ive replaced the ECU,

cleaned and taped the coils, now no missfires whatsoever. (big smiles)

Ive put in stock springs to get ride hieght right.

horn fixed!

indicator cancel fixed.

Hicas not looked at yet, light still on.

Ive repaired dry joints in the air flow meter (that caused some really shocking stalling)

Found a faulty IAC valve and I am still on the hunt for a working one.

Reset the throttle position sensor as it was out

The throttle stop was wrong, ive set that up right now.

intake leaks, all fixed.

Fuel economy was shocking so i replaced the oxy sensor. That helped its drivability a little, but current problem still there.

It runs ok now when driving along highway and around town, but at the traffic lights and at home, it plays up a bit. It seems to stall a little now and then and it also hesitates when you go to drive off. I thought at first that it might be a loose spring in the blow off valve, but I blocked it off and it still does it.

I have read around and it seems I may have a dirty AFM but ive cleaned it and that made no difference.

I do have an oscilloscope which ive put onto the inputs and watched them while driving and havint noticed anything that would point to this problem.

Does anyone have a clue what I should look at next? Ive still got feeling that I should buy another AFM and try that. but the oscillocope shows that the current one seems to be working fine.

anyone got a clue!?

its really not very drivable at the moment, gives me the shits and i tend to drive my other car to work instead! NOT GOOD lol

Edited April 8, 2010 by stimps

[mad082]

that temp are the spark plugs, and what gap?

[stimps]

They are NGK ones supposed to be right ones for the car, they are gapped to 0.7mm

I can go see what the number on the spark plug is i suppose, i didnt think they were an issue to be honest, i think of all things, my igntion seems to be really good at the moment:) certainly not the cause of this stalling issue.

If it was, it would cough and splutter, rather than just act doey or cut out like it is now

[Luciano]

a dirty or faulty AAC valve can cause engine idle issues, maybe enough to make the car stall now and then.

theres a DIY on cleaning / freshening it up and resetting your idle which you can try here

the images are R33, but it should be very similar. it can be a bit of bitch to get to & remove/refit, but its really not a hard process overall.

[stimps]

Already found the fault.

I had already cleaned the ACC valve, and found a faulty IAC valve, thats a seperate issue.

the problem was, some git owner before me, has extented the AIR flow sensor wiring, for no reason !?? and had just twisted and taped the wires together, - NO SOLDERING!!

*shakes head* no wonder it was playing up lol

[lagperformance]

Already found the fault.

I had already cleaned the ACC valve, and found a faulty IAC valve, thats a seperate issue.

the problem was, some git owner before me, has extented the AIR flow sensor wiring, for no reason !?? and had just twisted and taped the wires together, - NO SOLDERING!!

*shakes head* no wonder it was playing up lol

joys of the skyline lol i got 3 engines do you need an aac valve i gotta spare one and lots of other parts check my topics or give me a call 0450 728 189

[stimps]

ALRITE this problem PERSISTS!!!

turns out the wiring issue was hiding another problem and its still kinda the same! ill make a new post tho.....