Cylinder 1 misfire

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08-07-2022 | 05:09 PM

sparky814u

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Cylinder 1 misfire

Hey everyone, new to the page and have a problem with a 2008 Mini Cooper base that we cannot figure out. Bought the car with the code for cylinder 1 misfire. Replaced all the spark plugs and coil packs. Replaced cylinder 1 fuel injector. Replaced several components of the evap system. Did a compression test on each cylinder and the all hold pressure. We clear all the codes, start her up, runs fine, then take her for a test drive. After doing all of this, the car begins to misfire again, at idle, only after driving it for about 3-5 miles. The CEL comes back on and the code for cylinder 1 misfire reappears. It seems like the misfire presents itself again only after the engine gets warm. We even did a compression test after driving her to see if it was loosing compression after heating up…it still has compression. She has 185,000 miles on her and is the N12 motor. Any suggestions or info would be of great help. Thanks

Last edited by sparky814u; 08-08-2022 at 06:53 AM.

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