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Thread: strange issue that only last 2-3mins...

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2019-08-13 21:30:53
strange issue that only last 2-3mins...
I an having an issue using Nismotronic on my SR20VE that is pretty strange and not quite sure what it is. It usually happen when the ECT is about 75* , so a short trip to the shops or the like. When I get back in and attempt to accelerate it feels like the car if starved for fuel or timing is retarded , its hard to describe. It only lasts for 2-3 minutes I get check engine lights(codes are usually sensors IAT, MAF, MAP which I am not using) the AFR come back to 14.6 then the car it absolutely fine. If I go on a long drive for an hour without a stop before its up to temp, its fine . It is pretty predictable when it will happen , I just try to sit and idle until my fans activate so I avoid it happening in traffic or at lights or other bad spots which has happened. I have a tonne of logs and my tuner and I are scratching our heads. We are thinking it maybe a TPS setting maybe that has been overlooked.
I am running the 90mm throttle body, I have cleaned the IACV and also a newish TPS.
Any ideas would be much appreciated .
2019-09-06 04:51:42
Did I post this in the right section?
I think it maybe in the post start enrichment at about 75-85* ECT.
2019-09-06 08:33:41
Can you post the logs, or screenshots of the logs, where this is happening?
2019-09-19 14:07:36
I will try to get a fresh log with the current tune today. I have a folder with 1070 logs but cant recall the specific tunes they correlate with to run them.
It usually happens after the first short drive for the day , i.e drive down to the local shops ECT reaches about 70-80 deg. then when I jump back in to start again that's when it usually happens.
2019-09-26 19:59:33
ok, I have finally got some time to post up the log. I am just Idling
I have it in both formats.


It has to be triggered by temp as it seems to happen at 70-80 deg c.
2019-09-27 07:57:22
Haven't looked at the logs yet but I'm wondering if it finally gets up to temp where the ECU starts to used closed-loop fueling and starts to read the oxygen sensor. Maybe the oxygen sensor is bad and that's the problem? Does the car behave the same with the oxygen sensor unplugged, or is it worse? When the problem is happening, does it go away by revving over 5k RPM (when the ECU switches back to open-loop control)?

What software is best to use to view the TCL file?
2019-09-27 10:38:52
I view the TCL in Nismotronic, you will need the tune to replay it. The CSV should open in google docs.
It doesn't go away when revving at all. I was thinking maybe sensor initially, however it has been happening at the exactly the same point for the last 6 months, and the rest of the time its totally fine.
We thought it may have something to throttle enrichment, made changes but still happens. it did changed they way it happens slightly. It is hard to describe what happens.
Last edited by pedro666 on 2019-09-27 at 10-41-01.
2019-09-27 17:12:07
What happens when you load a completely different tune from a completely different tuning lineage? (But one that will run your car....)
Does it still exhibit the same behavior? That could be your quickest way to diagnose it being something odd in the tune like temp-based fueling or ignition trims, etc.
2019-09-27 20:25:35
Actually , I can not recall if we did. I am not sure if I have one .
It always happens at 70 -80 deg cel.
Last edited by pedro666 on 2019-10-08 at 00-29-57.
2019-10-18 04:55:11
I have gone through hundreds of versions of the tune , so far still happens.There are still few more to go though.,
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