I bought my 2008 135i (N54) a little over a month ago. I traveled 6 hours to check it out and it was already warmed up when I test drove it. Everything was great and I took her 6 hours back home without a problem.
The next morning, I started her up and there was a misfire once I started driving. The colder it is, the worse the misfire is. Either way, after a minute or two of driving, it disappears. One time it was bad enough to throw the SES light for multiple random misfires. The light went away 2 days later. It doesn't seem to just be on 1 cylinder, but I could be wrong.
On a warm day, it won't misfire at all. But at nighttime or early mornings that are cooler, it will happen. The car has 84k and I thought it could be the intake valves, so I got them blasted. The car is a little smoother, but the misfire is still there. The previous owner said he replaced the plugs not too long before I bought it. What should I do?
The next morning, I started her up and there was a misfire once I started driving. The colder it is, the worse the misfire is. Either way, after a minute or two of driving, it disappears. One time it was bad enough to throw the SES light for multiple random misfires. The light went away 2 days later. It doesn't seem to just be on 1 cylinder, but I could be wrong.
On a warm day, it won't misfire at all. But at nighttime or early mornings that are cooler, it will happen. The car has 84k and I thought it could be the intake valves, so I got them blasted. The car is a little smoother, but the misfire is still there. The previous owner said he replaced the plugs not too long before I bought it. What should I do?
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