need help! 02 sensor question
need help! 02 sensor question i installed a set of longtubes and an ory in the spring of 08. ever since then the car has stumbled and bogged out around 2200 rpms. i had the rear o2 sensors tuned out b ut its throwing a code for a bad 02 sensor, so i figured it was the front ones, i replaced them and it stopped stumbling and then about 100 miles later it started again. i repeated this two more times with no luck. it just fouls out the 02 sensors immediatly. i have a mail order tune from frost, a sponser on here. he said he could send me a speed density tuned pcm and see if that changed anything. i just wanted to see what you guys thought about it. thanks guys
TECH Resident
Joined: Aug 2004
Posts: 875
Likes: 2
From: Portland Oregon
Do you have a wideband to find out what is going on. If you don't know the air/fuel ratio, or what reading your 02's are showing, you can't really tell what is happening.
You need a scan or a wideband. Headers can make the O2 less accurate at lower rpm, but you should not be fouling out sensors in 100 miles unless something is really rich. Go to a dyno, check tho A/F ratio at idle, mid, and WOT.
You need a scan or a wideband. Headers can make the O2 less accurate at lower rpm, but you should not be fouling out sensors in 100 miles unless something is really rich. Go to a dyno, check tho A/F ratio at idle, mid, and WOT.
