613SSC Balt

Just installed my AEM wideband on my cobalt sc to see what afr's it was running, turns out its running really lean in boost. Mid 12's to mid 13's at full boost, anybody else had any weird readings like this?

blueLNFftw

iTrader: (16)

Is the gauge calibrated?

613SSC Balt

Not to the cobalt it was in a different vehicle before and worked fine.

blueLNFftw

iTrader: (16)

What does it read at idle?
"Full boost" means nothing because its RPMs vs Throttle % that will have the most effect on AFR.

613SSC Balt

14.7 at idle. Stays around 14's until high boost/rpm.

blueLNFftw

iTrader: (16)

Again, "high boost" has little to do with AFR; RPM vs. Throttle position.
Regardless, what tune is on the car?

Staged07SS

iTrader: (25)

For an accurate reading, you need to calibrate the gauge to your car OP.

Do this, and report back. Mid 12's to 13 in the upper rpms would be very lean.

Spanky's Monkey

iTrader: (6)

I thought AEM widebands didn't need calibration?

Staged07SS

iTrader: (25)

Not sure. I'd assume they would. I don't have an AEM though....

My wideband self calibrates at startup, and I manually calibrate twice a year.

If they dont, and the OP's A/F ratio's are in fact mid 12's to 13's he will need that checked out asap.

yellowsupercharged06

iTrader: (3)

Gas rag it and make sure the sensor is all good.

Spanky's Monkey

iTrader: (6)

Just checked and they don't need it so op is most definitely in need of help.

ECaulk

iTrader: (6)

Yeah the AEM's dont require calibration they just go bad over extended use.

OP what tune are you on? If you got tuned without the wideband i'm not surprised you're running lean, you need really good injector tables to be spot on (some tuners do have access to this information)

southal cobalt

iTrader: (3)

pre cat or post cat??

blueLNFftw

iTrader: (16)

did OPs car blow up>?

yellowsupercharged06

iTrader: (3)

i scroll down to the bottom of this thread .... and what are the Ads for .. AEM wideband ....

blueLNFftw

iTrader: (16)

And insanely priced sensors.

You can buy OEM VW ones that fir it for like 40 bucks haha