I recently installed a cold air induction pipe and high flow filter and now I'm getting crappy mileage and shes throwing a code 45 (oxygen sensor rich). The code only occurs at freeway cruising speeds. I drove it without the filter to see if the air flow was restricted but it still threw the code. The CAI is a custom job (ie, I cobbled it together myself). I have the MAF mounted directly to the TB and then have a 90 degree elbow and a straight pipe going down beneath the car. Could the MAF being too close to the TB cause a problem?

 

Uh did your car have the TPI style dual snorkle that i thought all 2.8l camaros had? if so you just did a step back to a much less efficient intake.

Edit: didnt mean to sound rude just givin ya some info and if the MAF is mounted strait to the TB the vibration of the engine could be causing a bad reading because they read the pressure of the air against a wire or some such. i know that you are supposed to test and see if it is good buy just taping it with a wrench and seeing if the engine sputters, so having it directly exposed to the engine vibs could cause problems.

 

Make sure the oxy sensor wire didn't somehow loosen up and is melting on the exhaust pipe... that'll throw a false 45.

 

what about the air temp sensor?

sure ya didn't goof the MAF?

I am not saying this is set in stone, but when I bought my MAF
AZ said you must unhook the battery before installing or unhooking it.
Th said they would not replace it unless you had done this.

now wether or not you can fry one by unplugin it or back in withthe battery hooked up, I dunno.

But you can bet good money I have never done it with my battery hooked up.

 

I fried 2 MAFs in my '85 Z, so yeah, I am much more careful now when removing or installing the plug.


You did touch on something though. I have not attached the air temp sensor yet, so it is technically reading engine compartment temp, not intake temp. Could this cause the MPFI system to run rich? I ran my '91 RS (TBI) like this for years with no problems.

 

The hotter the air temp it's reading, the leaner it gets because the air is less dense, therefore requires less fuel. So if it's reading 180* air all the time but the air going in is actually 100*, it'll be lean.

TBI systems are much more forgiving about that kind of thing since they use a MAP system.