My a/f ratio at idle is 17+ starts reading --- on my aem uego after it idles for a little, I did not get the exact number at WOT but it appears to be working properly. I tried searching and read mixed answers, anyone know if there is an issue or bad sensor?

My only mods are TBE and a boost gauge.

 

Take the sensor out of pipe and let it read in the air. It should read 14.7. If it doesnt there is a problem somewhere with the wideband.

 

my LC-1 was off after i calibrated it. i found that it is very sensitive. i had to remove the sensor, let it sit for a while to make sure no exhaust fumes were near. then did a free air calibration. it read 20.2 in the air. once installed it read 14.7 running.

 

ill try letting it read free air tommorrow, its an AEM and only reads up to 18

I fear it may be a result of an exhaust leak, does this sound probable?

 

unless the exhaust leak is before the wideband sensor, it wont affect it.

 

The only place I can think it would be is the downpipe, I left the stock donut gasket and I put my hand up there before it got extremely hot and felt nothing but im not sure.

 

Doesn't a high A/F ratio at idle suggest a vacuum leak? My aem wideband reads 14.7-15.1 at idle.

 

My ZT-2 reads 14.6-14.7 at idle. Sounds like you need to recalibrate yours...

 

At idle the perfect A/F ratio should be 14.6.

 

To be more precise, the stoichiometric air-fuel ratio is 14.7:1. At this point, there is exactly enough air to completely combust the gasoline and air mixture.

http://en.wikipedia.org/wiki/Stoichiometric

 

same exact problem, would like to hear more opinions.

 

I installed a new donut gasket now its at about 14.7-15.3 at idle