Quote:
Originally Posted by steve99
you can log ltft and afr and commanded afr with oft
if the ltft is high like over 10% at low rpm usually indicates leak or o2 sensor issue
you can spray some soapy water arround sensors when engine cold and then start car look for bubbles.
it may be a damaged sensor but they are not cheap so best to confirm its stuffed first which can be difficult
the ring\washer on the o2 sensor should not be loose and sensor should be screwed in all the way.
you probavbly going to have to pull off header remove both o2 sensors check for damage or stripped threads, run tap\chaser through o2 bungs in header
e nstall o2 sensors ( replace if threads stripped or damaged) and header with new gaskets
or just take it to a shop to sort out.
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I have logged it w/ OFT. The AFR was usually 14:1 and goes up to 20:1 a few times. Ltft from the last I saw it was higher than 10%.
I'll rather replace the sensors and gaskets to make sure everything is new and won't cause any problems later on.
Thanks for your help Steve. you're giving me a lot of information that are helpful. I will buy the gaskets and O2 sensors and then take it to the shop. And hope to get it fixed.