Faulty O2 sensor - surging idle??
Thread Starter
Instructor
Joined: Nov 2000
Posts: 195
Likes: 0
From: Cincinnati Ohio
Faulty O2 sensor - surging idle??
My turn for a little trouble.
My car ran great until a few days ago when it developed a weird idle. Fluctuates between 400-700 rpm and doesn't want to go smoothly from a stop. Once it gets going it seems to run ok, but the power just doesn't seem to be there.
I took out my predator tune and went back to stock. Same problem. Did a data log that showed the pass front o2 sensor is registering numbers that are vastly different than the other 3. At times it registers 0 mv and 10 mv. Could this be the idle problem?
One more thing - I'm not geting any codes about the sensor.
Thanks for your help!!
My car ran great until a few days ago when it developed a weird idle. Fluctuates between 400-700 rpm and doesn't want to go smoothly from a stop. Once it gets going it seems to run ok, but the power just doesn't seem to be there.
I took out my predator tune and went back to stock. Same problem. Did a data log that showed the pass front o2 sensor is registering numbers that are vastly different than the other 3. At times it registers 0 mv and 10 mv. Could this be the idle problem?
One more thing - I'm not geting any codes about the sensor.
Thanks for your help!!
Last edited by The Black Knight; Oct 13, 2005 at 10:47 AM. Reason: More info
Burning Brakes
Joined: Jun 2004
Posts: 884
Likes: 1
From: McKinney TX
Honestly, I'd look for a vacuum leak first. If you have an aftermarket intake check all your hose clamps, fittings, etc. Then the vacuum lines from the crankcase breather and anything coming off around the throttle body. 
Thread Starter
Instructor
Joined: Nov 2000
Posts: 195
Likes: 0
From: Cincinnati Ohio
You were right on the money t56gen3. Got out the spray bottle and sprayed it all real good and there it was. A small 2 inch hose on the pass side behind the throttle body has disintigrated. Fixed it in a minute and now she's back to normal.
Thanks again.
Thanks again.
