Ugh another missing out thread ...
Thread Starter
On The Tree
Joined: May 2007
Posts: 143
Likes: 0
From: connersville,IN
Ugh another missing out thread ... a few days ago while driving my 94 Z28 i parked it and came back and drove off and noticed my SES light was on .. i thought damn it not again ..(note i replaced my opti,plugs,wires, and 1 o2 sensor over the summer) and today i was getting on it a bit and noticed my car would run fine up to about 45mph .. wtf ... seems like its a higher rpm miss 
Is it my other o2 sensor maybe causing this ... i replaced the easy one to get too .. i think driver side ... because the other is behind the header If I recall
Is it my other o2 sensor maybe causing this ... i replaced the easy one to get too .. i think driver side ... because the other is behind the header If I recall
they are a PIA to get to, if you had it scanned it should show which bank has the problem. Your precat 02's are what drive the PCM for fuel mgmt and why it all of a sudden just started running bad doesn't sound like a bad 02. I've had 02s go bad on both sides due to needing a tune, being too rich and affecting the 02 performance thus making the car run bad. Just curious have you been through any major rain getting the opti wet?
i see $$$$$ getting spent soon 
