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Originally Posted by alpine_M5
So originally thought my stage 1 tune was causing my car to run lean but it appears its something else. Car has new spark plugs and was just at the BMW dealer getting a new passenger side fuel pump (bank 1) which they thought that solved the issue. The car is still pulling P0171 and P0174 codes. Sometimes its just one bank or sometimes it pulls codes for both. Any idea what it could be? Car drives relatively fine however it bucks quite a bit from a stop once i hit the gas, very jolty once i hit the gas. It does seem somewhat sluggish as well. Car also puts out a strong gas smell when im standing outside of it. Everytime i get out im like "damn this thing is stinky"... I was thinking possibly injectors? Anyone else with some insight? Car has 66k miles, bone stock besides charcoal delete and K&N filters.
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I'd start with the cheapest and easiest thing first. Clean the mass air flow sensor with MAF cleaner from an auto parts store. Use YouTube as a reference on how to do the cleaning.