So recently removed my intake and repositioned my catch can and immediately after the Check engine light came on. I currently have lean codes bank 1 and 2 that won't go away.


Step 1. I had just rebuilt my needswings intake, and found several loose bolts. All have been tightened. Still lean.




Step 2. I found 4 loose bolts at throttle body, tightened. Still lean.


Step 3. Moved my catch can ( not needswings) behind the heat shield on the pass side to keep the intake cooler. Under the hood is a bit cooler but I am still lean. My next step is the check all the fittings on the catch can to see if there is a vacuum leak before the TB.


Back to step 2. I found the TB bolts super loose. Did I read that the TB gasket can fall out of place?


I think I will remove the TB all together and check the gasket. Ideas and thoughts are welcome!