Rough idle with forced induction

Cell · 07-11-2014, 06:02 PM

Hey guys, just reporting back from Gale's thread.

Today I drove my car to the gym and paid extra attention to the AFR and idle.

So, my idle is perfectly normal and stable. No bounce.

My AFR at idle is reading between 13.7-14.7. That is at both extremes. For the most part at idle it is usually bouncing around 14.0-14.4.

Seems like, from face value without data logging, my tuner made it run a bit rich at idle.

Mitco39 · 07-12-2014, 01:11 PM

Quote:

Originally Posted by Cell

Hey guys, just reporting back from Gale's thread.

Today I drove my car to the gym and paid extra attention to the AFR and idle.

So, my idle is perfectly normal and stable. No bounce.

My AFR at idle is reading between 13.7-14.7. That is at both extremes. For the most part at idle it is usually bouncing around 14.0-14.4.

Seems like, from face value without data logging, my tuner made it run a bit rich at idle.

Maybe the richness is the trick to keep it from doing what we describe. You would have to just log it to see what the target afr is set at. I suspect you might just have the same issue I had where one bank is at 14.7 and the other is at ~13.7 or so.

GaleForce · 07-12-2014, 03:23 PM

Quote:

Originally Posted by Mitco39

Maybe the richness is the trick to keep it from doing what we describe. You would have to just log it to see what the target afr is set at. I suspect you might just have the same issue I had where one bank is at 14.7 and the other is at ~13.7 or so.

FWIW, my AFR is rich at idle.

07-11-2014, 06:02 PM	#1 (permalink)
Cell A True Z Fanatic Join Date: Jan 2010 Location: Chicago Posts: 1,449 Drives: A Garbage Truck Rep Power: 23	Hey guys, just reporting back from Gale's thread. Today I drove my car to the gym and paid extra attention to the AFR and idle. So, my idle is perfectly normal and stable. No bounce. My AFR at idle is reading between 13.7-14.7. That is at both extremes. For the most part at idle it is usually bouncing around 14.0-14.4. Seems like, from face value without data logging, my tuner made it run a bit rich at idle. GaleForce and Mitco39 like this.

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