Hey guys managed to capture two of my current gremlins in one log and was wondering if anyone could shine some light on my issue.

Currently when I am cruising at a constant speed my afr will walk from about 12.5 to 15.0 and back and forth while I am at a steady cruising speed now matter what gear.This log has auto tune running on it if that makes a difference. The second issue is i will randomly stall when I clutch in to come to a stop. This issue only occurs when the car is at operating tempurature. It will try to catch the idle and then just drop off.

This log has both those events, I pulled out of a parking lot to get the cruising log and then when i pulled over it stalled. Any help is much appreciated.

 

The only point in the log where I see a 12.5 to 15.0 swing is when MAP is changing. Steady state isn't fluctuating anywhere near that much. Is there a specific time in the log you're looking at? I see fluctuations from about 14.0 to 15.2 during steady state. Those fluctuations appear to be from EGO. It's swinging back and forth between 100% and 112%. Maybe try using PID algorithm instead of simple.

To fix the stalling issue I would recommend going to closed loop idle settings and switching from use last value to use initial value table. Then do a search on how to setup that table. IIRC there is already some excellent info on that.

 

I looked at it again and around the 45 second and on mark you are right its not fluctuating nearly as much as i thought. On the log its going from 14.2 to 15.4 but when i drive my wideband gauge shows a way wider fluctuation. Maybe it needs a calibration?

I will give those idle changes a try today, thanks for the advice.

Cheers

 

Now i have even bigger problems, my car wont idle at all when started hot. Scratch the stalling at clutch in it wont even run hot. I spent the morning comparing and what i thought to be improving my idle settings off of trubokitty's maps but it made the idle hang at 2k and then stall after hunting.

Really am stumped and miss driving my car. Any help would be tremendous.

I should add the log is after reverting mostly back to my settings and trying to fix it on my own.

 

Is it a failing map sensor in my MS3? I switched the car to Alpha-N and it got up to temp fine without shutting off and started fine at all temps.

Switched back to speed density and car wont run for a second.

 

Okay I loaded an old tune file and it got up to temp but once at operating temp it starts to hunt like crazy to the point it will stall out. Ive come full circle to hoping it is a tune issue and not mechanical.

Attached is a log of it hunting, what can i change to calm it down at temp?

 

If you're going to use the idle VE table then you need to tune it properly. I prefer not to use it at all. EGO is still swinging between +10 and -10% because the Idle VE table is not good. Your main VE table is also not tuned properly in the idle areas which will cause issues moving in and out of closed loop idle.

I don't see anything indicating a mechanical problem. You just need to learn to tune.

 

It's been a while since I've looked at it, but there are several settings on EGO that are fairly intuitive. If its causing afr swings you can decrease authority and how quickly it makes adjustments until you find a sweet spot for holding a steady afr without overcorrecting.

If this is an NB, the ecu sits right between the pedals. Twice I've had the MAP line work its way under the clutch pedal. Car will run great until the clutch goes down and pinches the line. That could be worth a look if this is an NB.

 

Just as i had hoped i think the real issue is the guy on the laptop here... me. I spent the night watching idle tuning videos and made some good progress but felt bad idling my car at 10:30 at night. It starts and idles decent now, going to finish the VE table and initial value tables this afternoon and hopefully take it out and get some gas!