a/f bouncing?

tromspert

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#1
hey guys I have a maft pro running in speed density mode and I noticed my a/f ratio bounces between 15.2 and 13.8 at idle. it usually hangs in the 14 range but it seems odd that it bounces like that. Any idea what it could be?

video attached. the numbers listed are the extremes i've seen it hit at idle while warm but the video shows what i see on average.


http://youtu.be/gk0LkcdoVq0
 

tromspert

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#2
hey guys I have a maft pro running in speed density mode and I noticed my a/f ratio bounces between 15.2 and 13.8 at idle. it usually hangs in the 14 range but it seems odd that it bounces like that. Any idea what it could be?

video attached. the numbers listed are the extremes i've seen it hit at idle while warm but the video shows what i see on average.


http://youtu.be/gk0LkcdoVq0
bump?
 

figgie

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#3
are you reading off the stock o2 or is this a wideband?

if it is stock.. that is normal. the narrow band basically just bounces between lean and rich side. The TSRM states that a multimeter should bounce x amount of time for it to be considered in spec.
 

tromspert

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#4
are you reading off the stock o2 or is this a wideband?

if it is stock.. that is normal. the narrow band basically just bounces between lean and rich side. The TSRM states that a multimeter should bounce x amount of time for it to be considered in spec.
I have an lc-1 wideband although it was there when I purchased the vehicle. Should it still bounce? Started it up yesterday and she hung at 14.4 and barely moved.