Nolimits31

Today when i started the car up i let her idle for awhile and i noticed the a/f was between 11.6-12.2. she usually reads around 13.0-14.2 but why such a difference today? is this safe or should i contact my tuner?

mustangman281

What is the temp outside?

Nolimits31

today it was about 55 with very little sun.

mustangman281

Did it stumble at all or run rough?

Nolimits31

no everything sounds normal at idle i didnt take her out since it was on our lift at the shop cause i am trying to figure out an emissions problem. maybe you can help me with that too, i get a code p0443 stating emissions system purge valve circuit and i replaced the silonoid in the rear of the car that connects to the vaccumm canaster and that did not fix the problem. what else should i check.

mustangman03

could be a wiring problem

vanquish

What wideband are you using? I'm using an AEM and sometimes I have to drive my car for a while then the AFR's get more consistent.

01GT4.6

I think (could be wrong) that I had that same code when I had a vacuum line to the gas tank loose, but I think the gas cap with throw the same code as I had...

jvog

When I start my car up it hovers around 12 everytime. Once it warms up it reads around 14.5

Nolimits31

yea i think it will be just fine now i need get this gd service engine soon problem taking care of it is driving me crazy. o by the way it did not come on until after i had it dyno tuned. maybe something my tuner did?