Hi guys,

At first this problem was only limited to when the car was idling, however it has now started doing it under light throttle in heavy traffic, which does worry me.

When idling, AFR's will sometimes go way lean (up to 21, which is the highest my ZT-2 reads), rpm will drop to 2-300 rpm, and the car will struggle to idle for a few seconds, after which it seems to wake up and start fuelling properly again.

This morning however, in bumper-to-bumper traffic on my way to school, AFR's would sometimes go to 21 even though I was giving the car light throttle and the engine was under load. This is what brought me to post here; running the engine that lean under (admitedly light) load surely isn't the best thing?

I can get logs and post a video of the tach/wideband if you guys want.

Thanks in advance!

 

If it truly is running that lean, it will eventually throw a CEL. Check your trims.

 

Here's a log with the trims, because I'm not really sure how to interpret their values. It's basically the full log of my drive home from school, but I filtered the data to only have entries where rpm < 1200 and TPS < 20.

https://spreadsheets.google.com/ccc?...thkey=CJTtiqUD

 

Bump! May post this in the Ecuflash section as well as it might be tune-related (more traffic there as well, I think)

Here's a sample of the above log highlighting the issue - red boxes are AFR and STFT.