Quote:
Originally Posted by ptaylor_9849
CAI without a tune caused me to fail come inspection time. It through a code saying bank 1 too lean. Too much air and not enough fuel.
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+1 CAI increases the air flow - without a tune the fuel levels aren't increased and can cause the car to run lean (which can be a very bad thing...)
When I had just a K&N CAI on my Mach the car would stall itself out because it was running too lean (protective measure on the cars part). Had to get it tuned to fix the issue.