[Z06] New Intake System- Lean Codes ??????
Thread Starter
Burning Brakes
Joined: Aug 2007
Posts: 831
Likes: 2
From: Houston Texas
New Intake System- Lean Codes ??????
Recently installed a freer flowing intake system on my 2002 Z06.
With new intake I am getting the 171 and 174 lean codes for both banks.
Have done the Idle Relearn- no luck. Have switched MAFs - no luck.
The install is tight- no air leaks between MAF and TB.
Anyone have a suggestion?
With new intake I am getting the 171 and 174 lean codes for both banks.
Have done the Idle Relearn- no luck. Have switched MAFs - no luck.
The install is tight- no air leaks between MAF and TB.
Anyone have a suggestion?
Safety Car
Joined: Nov 2003
Posts: 4,108
Likes: 0
From: San Jose CA
I had the same issue with my 02 Z when I put a Stinger Intake on it. After searching the forum, I did a "Cold Air Mod" written by one of the members Dave68. After I did that, no more engine light. It's something to do with the turbulant air in the MAF, and that our Z's don't have screens on our MAF's. But even though the engine light won't come on, it could still be lean. A tune is the best thing, plus you'll pick up some added hp/tq. 
Here's a link to the Cold Air Mod
http://www.conceptualpolymer.com/corvette_c5_corner.htm
Here's a link to the Cold Air Mod
http://www.conceptualpolymer.com/corvette_c5_corner.htm
Race Director
Joined: Jan 2006
Posts: 10,554
Likes: 33
From: Not on either liberal coast.
I'm at 5,200 ft altitude and installed a BLACKWING w/ cover on my Z16 when I got it. I also got the same intermittent codes.
Instead of the long round trip and expensive $250-500 tune, I returned to a modified oem intake...not as sexy, but it sounds the same and I get no codes.
Just for fun, check all of the clamps on your intake system to make sure there isn't an air leak somewhere. I found a "pucker" on the after market smooth coupler at the very bottom where it connects to the throttle body. It was impossible to see w/o a small mirror. It didn't cure the codes in my case, but you might get lucky.
Instead of the long round trip and expensive $250-500 tune, I returned to a modified oem intake...not as sexy, but it sounds the same and I get no codes.
Just for fun, check all of the clamps on your intake system to make sure there isn't an air leak somewhere. I found a "pucker" on the after market smooth coupler at the very bottom where it connects to the throttle body. It was impossible to see w/o a small mirror. It didn't cure the codes in my case, but you might get lucky.
