I just tried a CAI with a AEM filter on it. I disconnected the battery for 10 minutes. I drove it and after awhile I kicked a CEL. I believe it was a P1072 or P1076 whichever the one is for running rich. I mean wouldnt it say it was running lean not rich. Well after getting rid of the code a second time I also noted a rotten egg smell coming from the exhaust so Iswitched back to the stock air box. Any ideas guys?

 

goes over maf fail freq of 10000hz ... do a search man bunch of threads on it and how to fix it

 

What happens is when you change the diameter of the intake pipe where the mass airflow sensor is located, you throw off the calibration of the MAF. The MAF is the cars primary means of metering how much air the engine is ingesting. Think of it sampling a certain percentage of incoming of air stock. When the diameter changes, the sampling percentage does as well.

 

06 do a search on what? I have done a search on here about the code. Do you mean on google? Also how do I fix this or can I?

 

What code is it exactly? I thought you said it was a fuel trim over correction code, but Paul is saying its a MAF over frequency code. I'm confused.

To fix it, you either have to find someone to recalibrate your MAF sensor with HPTuners, live with the SES light being on, or return the intake tube to stock.

 

My code reader doesnt distguish if it is a MAF or not. It is saying it is running rich. I did return it back to stock though. Just wished I could use the CAI. No one here in El Paso has HP Tuner so I am SOL.

 

bet its 0171....


edit, just read rich...thats 0172....

 

I thought 0171 was running lean not rich?

 

it is...0171=lean

check your connections again, check the MAF sensor too.

 

yeah sorry man shoulda been more clear on that one.. but yeah 90% of the time its a maf frquency problem you're probably hitting 10500 hz maf frequency and the stock fail code is set to 10,000 hz . also make sure you have the maf installed correctly, and if you touched it, you will need to buy maf cleaner and clean it off real good.. oils from your hands can f' the readings up.

 

Ok, to clarify real quick, there is no way the car knows if its running rich, what actually is happening is the PCM is having to correct its calculated incoming airflow more than 20% to allow the car to run at 14.7-1 air/fuel at idle and partial throttle. Minor detail, but its actually the fuel "trim" system is out of whack, not the actual combustion.

We're saying its a MAF problem becuase first of all, thats the sensor calibration that would have been changed by altering the diameter of the intake pipe. Second, the MAF is the car's primary method of metering incoming air, so it the trims are exceeding 20%, the MAF is going to be the first culprit.

If you have no way of altering your stock calibration, then returning it back to stock is sadly the only way to fix the problem.

 

Well I I know now it was 0172 then. The car just got the Stage 2 upgrade so I guess I am screwed for a CAI then. Man these cars are sensitive to upgrades. My 97Z wasnt this sensitive.

 

not really its mainly the maf is really sensitive.. especially with all the new emissions laws and sensors and ****... any new car is gonna have issues... its not like the CEL is a horrible thing man..

 

What about a PCM update? I thought I heard there is a flash for this issue?

 

Yea I understand that but when I start smelling rotten eggs out of my exhaust I know the engine isnt burning all the fule and the cat is suffering so I just changed it back.

 

I would also check to make sure your supercharger to manifold bolts are tight and nothing is leaking. Also check all vacuum hoses that you can see. I've noticed that stock, the MAF is slightly out of calibration on the lean side, and an intake change is usually to a larger diameter pipe, which would cause it to go on the lean side even further. Going towards the rich side due to an intake change means the tube would have to be smaller than stock, which is a lil strange.

 

I just went home and checked the CAI diameter. It is 2.5" wide as well as the MAF sits farther up the pipe than stock. THe stock air box opening at the filter looks like it is almost 3" as well as the MAF is almost at that opening. Would this cause the CEL?

Think if I was to cut the pipe down and open the pipe up some more at the filter end that it would stop causing a code?

 

Anybody have a thought on this that posted above????

 

a CAI shouldn't be any larger than stock, most are 3 inch either way.

some cars just seem to react differently. my 2.4 never once threw a CEL for it's
CAI. and i didn't disconect the battery or anything.