Code P0171, P0174
Burning Brakes
Joined: Dec 2014
Posts: 959
Likes: 24
From: Los Angeles, CA
so I bought a 5 point torx set on ebay and swapped out the Maf sensor but same problem so I put my OEM air filter back in have had no codes so far seems to be the K&N filter flows too much air?
Anyway I have an appointment for a Dyno tune and will install the K&N for the tune.
Anyway I have an appointment for a Dyno tune and will install the K&N for the tune.
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
Card style MAF's are especially sensitive to airflow changes. MAF's are only measuring a sample of the air, not all of it.. so just it flowing differently can change the MAF readings from what GM saw with OEM filters
7th Gear
Joined: Mar 2015
Posts: 7
Likes: 2
From: Indiana
I can tell you from experience, these Corvettes are very particular when is comes to inlet airflow. When you make changes to the factory setup the MAF is likely seeing a change it is trying to compensate for. Pulling lean codes on both banks supports this. Check your fuel trims. I they increase as you increase speed I would suspect the K&N setup as the culprit.
Race Director
Joined: Sep 2009
Posts: 11,338
Likes: 2,437
From: Eastern
Good Luck OP. I'm sure the K&N filter is on snugly, and no extra air is bypassing the filter element.
If it does, then it will cause a CEL due to incorrect air/fuel ratio.
My son recently had an issue with his. He found that the filter housing had come loose. He re-tightened, and the codes cleared.
I wonder why the Vararam CAI never gives any issues to the C6 when it's installed? The computer seems to be able to change to adapt to the increased air flow at speed.
If it does, then it will cause a CEL due to incorrect air/fuel ratio.
My son recently had an issue with his. He found that the filter housing had come loose. He re-tightened, and the codes cleared.
I wonder why the Vararam CAI never gives any issues to the C6 when it's installed? The computer seems to be able to change to adapt to the increased air flow at speed.
Last edited by 4SUMERZ; May 1, 2016 at 09:01 AM.
2nd Gear
Joined: Oct 2020
Posts: 2
Likes: 0
That's a vacuum leak code most of the time. Retrace your steps installing the air filter...did you remove the air cleaner? Perhaps not get it fully reinstalled? Knocking a vacuum line off normally won't be enough of a leak to set the code, the code comes up when the car needs more than 25% of fuel added to maintain stoiometric.
Sometimes folks will get their air filters too oiled and the oil fouls the maf sensor. Any chance this happened? You should probably pull the maf and clean it with maf cleaner but be careful it's a sensitive device with thin wires down in there.
Sometimes folks will get their air filters too oiled and the oil fouls the maf sensor. Any chance this happened? You should probably pull the maf and clean it with maf cleaner but be careful it's a sensitive device with thin wires down in there.
