Unstable AFR at low throttle

Reply Subscribe

Thread Tools

Search this Thread

Jun 28, 2008 | 07:13 AM

#16

W2J

Evolving Member

iTrader: (12)

Joined: Feb 2006

Posts: 286

Likes: 0

From: Trinidad

Quote:

Originally Posted by Toxin

Care to elaborate on that?

Quote:

Lean Spool Disable
Why?
When in open loop operation, the factory ECU artificially leans the fuel mixture by about 1 full ratio point which can cause difficulty in tuning for proper AFR. Disabling "Lean Spool" will also allow for your map AFR numbers to more closely align with your actual measured AFR.

https://www.evolutionm.net/forums/sh...d.php?t=261465

Jun 28, 2008 | 07:25 AM

#17

Toxin

Thread Starter

Evolved Member

iTrader: (2)

Joined: Jan 2008

Posts: 1,595

Likes: 2

From: Way ahead...

Thanks, I'll speak with 4WS to see what we can do about this. I don't think I'm up to this

Jun 30, 2008 | 07:29 AM

#18

Toxin

Thread Starter

Evolved Member

iTrader: (2)

Joined: Jan 2008

Posts: 1,595

Likes: 2

From: Way ahead...

Well after discussing it with Tamer, lean spool has nothing to do with it. Anyone else has an idea of the cause?

Jul 15, 2008 | 07:24 PM

#19

W2J

Evolving Member

iTrader: (12)

Joined: Feb 2006

Posts: 286

Likes: 0

From: Trinidad

^ maybe tamer should try it worked for many.

Nov 11, 2008 | 06:33 PM

#20

EVIL MR

Evolved Member

iTrader: (5)

Joined: Jul 2004

Posts: 974

Likes: 0

From: ORLANDO

Mine does that same thing Fluctuating afr during cruise lets say I am going 55 in 5th at steady rpm it will be fine for a bit until it will start going between 12.5 & 14.9 very fast, now I can stop that by giving it a little more gas and then it will steady again if I don't give it more gas it will give code 0134 saying that the front o2 sensor not working. I even disconnect the front sensor at the ecu and using zeitronix NBS at 14.7 and other values for better gas mileage. Again if I get my foot off the gas and on again it will start to jump and give the same code. my wide band is very new.