A Couple Nistune Newbie Questions

High nox = hot, timing too retarded, or too lean…

Timing was dead on (as tested by the smog shop), we already know it's running lean, that's what I'm trying to isolate. If I have no other choice, I will have to just enrich the idle fuel maps, but I would prefer to find out why the ECM is not enriching automatically.

Stock injectors?

Fix your egr ?

You really need to swap in a wide band 02, and feed signal to the ECU to properly monitor AFR

Let's elaborate

1.Logging feature is explicitly by command. you must order the system to log runs. i know the NisTune User manual is shite but read through it again to get baselines.
2.Have you adjusted your values (K, dwell, MAF adj. for system) for your setup?
3.I'm going to take a swing and say you still have the OE 02 sensors… junk em, go wide band if you're running NisTune and plane to pull out more power.((((((also, narrowband sensors usually take "in-or-out" readings so if you're seeing 0V the whole time i would imagine some sort of overly rich condition, watch your oil condition and cyl compression before you gas it down or wash em out))))))

* I don't want a log file, take it to a tuner

Get it running straight and take it to a reputable tuner. Likely chances are they know nistune on 240's, but its related, get ready to put some more cash up.

I apologize for the late update, this week has been hell. I decided to try swapping the NTK O2 Sensor I bought (that retarded shop claimed was bad), and remove the Denso Sensor they put in, when I found something that made me less than happy. My O2 sensor harness was left sitting on my exhaust manifold crossover and the two connectors are fused together! I can't even separate them to check the wiring. Anyone know where I can get an O2 Sensor pigtail for the 89 Z31. I'm wondering if the pins in the connectors are destroyed as I can see some remains of the Weatherpack seal amongst the melted plastic.

Just unplug it and leave it unplugged. Not really needed anyway.

I'd like to, but here in the land of emission Naziism they won't pass the car if the O2 sensor is disconnected. I ended up cutting the melted connectors off and splicing the wiring directly, still no voltage signal from O2 Sensor, so I'm going to ignore it and try tuning it up without it. I'm just looking at making it more rich around 15mph to hopefully get the NOx within spec to get my tags, then I will try to find a shop that's familiar with Nistune to do a full dyno tuning job. Anyone know of someone in San Diego County that knows Nistune?

Injectors are stock spec, new replacements though. The A/F Ratio during the 15mph segment of the test was more around 15.7:1 if I saw the screen right on the emissions program. Since then I've put the factory air box back on, reconnected the FTS (which came off while driving around warming new cat up), and have finally got my license for NISTUNE.

My knock sensor isn't connected due to damaged wiring, but I would imagine the ECM would just see it as no knocking (Knock sensor generates signal from vibrations, no signal no knock?).

With nistune you can disable the o2 feedback anyway, they recommend it for tuning… the wideband is far more sensitive and you don't want the ecu compensating while you're trying to find ideal values

The sensor always makes noise, the ecu then decides if that noise is normal or erratic and strong enough amplitude to consider it a knock

The car will be getting some more proper repairs later, but being unemployed, I'm just trying to get the smog and registration done. Electrically the EGR is functioning; I will see what I can diagnose with it mechanically tomorrow. I will be going crazy trying to keep my mind occupied the last half of this week anyways do to some more serious issues I'm having.