installed cat-by pass..now idle problems

[911SCcdn]

Could use some help.

i have a pretty much stock 81SC...everything has been running fine..installed a bursch cat-bypass. Took it out for a test drive..nicer sound....a little better throttle response.

Problem...when I returned...the car would stall or not idle when standing still.

I replaced the 02 sensor in the by pass pipe.

Again, it doesnt seem to want to idle when warm..has something changed...mixture? idle setting?

Any comments would be appreciated.

Andy
81SC

[RANDY P]

That's weird. Did that to mine a year ago and didn't have a single issue.

Thinking something else broke at the same time. Coincidence probably.

[911SCcdn]

just to clarify...the 02 sensor was reinstalled after installing the by pass....it has not been removed.

[911SCcdn]

bump

[Scooter]

I would check the wires going to the O2 sensor, sounds like one pulled out when you put the sensor back in.

[RANDY P]

Relay under passenger seat '83SC

Possiblilty it could be frequency valve relay just dropped dead? Unplug it and see if it runs any differently.

Good luck

[raceman]

sounds like the O2 sensor,unplug it completly and check for change.Probe a multiscanner into the green wire,or the only wire if it`s a non heated sensor and check for a reading.