Running Lean at Idle
I have a SD tune and am running lean at idle. I dont have a wideband on my log but it idles at 13.8 for a few minutes and then jump up and fluctuates from 13.8 to about 16 to 17ish. I have no idea what could cause this. When I dont have a wideband reading AFR I can tell when its running lean becasue it detonates when you give it gas it doesnt have any power and wants to die.
how do you know you are lean w/o a WB02?
if you have one, link it to the scan tool so you can
multiply BEN factor, there is no sense in having one w/o being able to log.
post another log w/WB02.
I have a fast and it logs without being hooked u to efilive. I just picked up an lc-1 so Ill make a log with it 2night or tomorrow. Any reason for the leaness by just looking at the log?
Stock timing is much too high for a cam'd application for low rpm and just off idle airflow. I had to pull upwards of 10~15 degrees of timing in that region to cut out some of the knock retard I was seeing at throttle tip in.
How much should I start to take out? And from what rpm?
how long has this been going on?
is it possible your WB02 is in need of replacement?
No its not the wideband because it doesnt have enough fuel in it to take off sometimetimes. Detonates really bad.
what changes have you made before this started?
Its a mail order tune thats been on my car. I used now got a wideband to check it with.
Try this one. I changed spark and some idle related tables. Fueling is still the same.Originally Posted by mikeyayell
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