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I replaced the MAP and that made no difference. I just now finished doing a compression test and found something unusual. Cylinders 1 through 5 are 230 psi, which, as I understand it, is way too high, they should be around 170. cylinder 6 is in fact 170. I read that high compression can be caused by carbon deposits, and if it’s running rich, maybe there are a lot of carbon deposits. Yet I don’t think it’s really running rich because it runs too damn good, AND as far as I can tell the downstream O2 sensors are reflecting a good mixture. Lambdas are around one, which is I understand it also means the mixture is good. It really seems more like the MAF is likely the problem.
Many people say that cheap MAF’s absolutely do not work. Furthermore, I see no cheap MAF sold on all the BMW parts websites that sell not just official BMW but other brands also. So, I’m thinking I really ought to break down and spend $200 on a new MAF, my third MAF.
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