Would a faulty 02 sensor cause an engines idle to feather? like jump up and down from 800-1500? on a jdm b16

 

bump

 

it could

 

I don't understand how it could. The O2 sensor is only used to help the ECU make on-the-fly fuel delivery adjustments based on exhaust oxygen content. I believe that if the sensor fails, the ECU will run on a pre-programmed fuel map that essentially always runs rich to be safe. I don't think this will cause an idle surge. Check for leaks around the throttle body and intake manifold.

 

check for vacumm leaks or bad iac valve

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fmrprojects &raquo;</TD></TR><TR><TD CLASS="quote">check for vacumm leaks or bad iac valve</TD></TR></TABLE>
what he said. or if your running a chipped ecu it could be the ecu.