Need Help Code P0171 / P0174
Le Mans Master
Joined: Nov 2003
Posts: 8,003
Likes: 249
From: Tampa Fl
St. Jude Donor '12-'13-'14
buy a smoke machine something like this to find out where your air leak is. https://www.ebay.com/itm/16446924553...075f%7Ciid%3A1
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,500
Likes: 3,999
From: Cape Coral, Florida
Welcome to the Forum !!!...Your freeze frame data shows the DTC's set at idle which would leave me to believe you may have a vacuum leak...RPM seems kind of high too at 981...has any maintenance been done to the car lately ??...to verify a vacuum leak run the engine at 3000 RPM for a few minutes...if the long term fuel trims slowly decrease you have a vacuum leak...yes, it's nice to have a smoke machine but your everyday Corvette owner doesn't own one...what you can do is spray some Brake Kleen (I use propane) around the PCV, brake Booster, purge solenoid vacuum connection at the intake manifold, intake manifold runners, air intake downstream of the MAF sensor...while spraying on a cold engine watch your SHORT term fuel trims...if they decrease quickly you found the leak...hope this helps !!...also going to move this to the Tech section.
Last edited by C5 Diag; Dec 13, 2021 at 08:22 PM.
