Do u have to calibrate an aem? My gauge is literally brand new and at wot it's reading in the 12's and even has flashed 13 once. I just got tuned a few weeks back and my Afr's according to the sheet are mid to high 11's. The o2 sensor is installed in the dp just before the test pipe. Any help/opinions would be appreciated.

 

Is there big variance in weather? If so your boost changed also...hence leaner conditions

 

Nope weather is the same.

 

AEM widebands say they are calibrated, each sensor is, and they do not require the "open air" calibration that some of the other widebands do. One thing you can do is google for the video of how to test a wideband sensor, basically spraying some carb cleaner or gasoline on a towel, and wrapping the wideband in it, and making sure the wideband reads full lean, then full rich or whatever the video says.

Any other method to determine the accuracy of the sensor, like...I dunno, nvm, did the same shop who gave you the tune sheet also put the wideband in? See if they'll test it and make sure all is well.

 

I've had my AEM for a couple years, original sensor, never had an issue and does not require calibration. Do you have any friends around that can loan you a sensor? it's just one plug to swap it out, should be a fairly quick and painless process to swap and verify.

 

a bad sensor is going to be stuck at 14.7-14.8 or read '- - -'

you can do the sensor test as per on youtube if you'd like.

when you got tuned w/o the wideband, the tuner probably tuned with a stiffer at the tailpipe... i have seen time and time again that those sensors are off usually 1 full point at the tailpipe.


time to go back in and get a retune...
a wideband should've been one of your very first mods when you began modding.

 

^^ yea I agree It deff shoulda been. And I bet that's what is going on. Thanks for all the info guys

 

or maybe you got unlucky and just developed a new boost leak... or

if you got this installed AFTER your tune, you cant exactly compare it to the dyno sheet's AFR. thats like comparing two different tuner's dyno results exactly, its hard to compare exact cuz of all the variables.

 

Yea. I'm still on maf so u figured a boost leak would be easy to know/figure out. The car runs good and doesn't seem to be detonating witch is hard to tell sence I have a o2 dump. But u figured if I was detonating the car would pull timing and it would run like **** at wot. I pulled the plugs and they "look" normal.

 

When you say during wide open throttle your seeing it in the 12's is this during spool-up or at full boost?

I have an AEM and I never had to calibrate it so I wonder if you have a faulty sensor...very strange considering you said its brand new.

For the record if you developed a boost leak your car would run rich as opposed to lean.

I would check to see if you popped off any vacuum lines.

 

During full spool. Checked all vac lines and everything is good. Car does break up sometimes during wot so I'm assuming it's lean

 

Log your car to see if it knocks. If it does, get it re-tuned, maybe try a different tuner.
I had similar thing happen. Got it tuned and after-wards my aem wideband was reading 12.4 at WOT (even though my tuner said on the dyno it was in the mid 11s). Then i logged the car and it was knocking a lot (14 around 6500rpm). I had the tuner change the tune to make it safe, now it's ~11.6 , no knock. Good luck.

 

i had the same prob, see aem wont release the paramiters to calibrate a wide band to ur tune. now i buy an innovative and call them up, they give it to u. i switched to innovative punched in the number into my open ecu tune. bingo reading the same and true.

 

maybe try hooking up the sensor to your computer to log (if you have that setup) and see if its reading the same in Evoscan. or try and meet someone that has one and swap them to see if theres a difference. Also try calling AEM there has to be a way to check it, and check the sensor too.