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N54 misfires and rough idle only on cold start and when temperature is cold outside
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02-10-2023, 02:38 AM | #1 |
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N54 misfires and rough idle only on cold start and when temperature is cold outside
Before anyone says anything, I have read the millions of posts already in the forum and I've tried nearly everything. Below I will explain my situation and what I've tried.
A couple months ago I started having misfires in cylinder 2, pulled the injector and my bore was damaged so I used an injector bore repair kit to repair the bore. After installing this kit, I was still getting misfires. It evolved into misfires across all of bank 1. Cylinder 1,2,3. Only on cold start. To this day even after everything I've tried, I am still having misfires on cold start. Below is what I've tried: I replaced injectors with all index 12 and 11. all new spark plugs (step 2 colder gapped to 0.021) swapping around coils (precision raceworks coils) leak testing all injectors (no leaks) compression testing all cylinders (all about 150-165, tested both cold and warm) I'm running PI and full e85 so intakes are clean More recently I had O2 sensor failure codes pop up for the first time after months of dealing with this issue with no definitive answer to what's causing it. I replaced bank 1 post cat and pre cat O2. And after all this I am still getting misfires on all of bank 1 and only bank 1. And only on cold start, or sometimes after I do some heavy pulls. Getting no codes other than misfire codes and like I said, more recently O2 sensor failure codes |
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