View Full Version : Lean code. Leak between throttle body intake and supercharger

05-06-2015, 09:03 PM
I picked up a CEL on part throttle yesterday so I checked it for codes. I pulled a 181 and 189 which are lean codes. I listened to the engine with a mechanics steth and tracked down a leak between the supercharger and the throttle body plenum. It is the MP plenum for the late model. Anyone else ever get a leak there?

05-07-2015, 07:11 PM
Other guys could more effectively answer the MP questions, but I do know that on my diy port/ polish job on my late model supercharger case/ plenum, I had went ridiculously thin on the sealing area (1/8" or so), but i'd also put some extra copper high heat RTV around the outside of the supercharger/ intake sealing area and have had no problems (as of yet).