E46Fanatics - View Single Post - The pesky 3% LT fuel trims
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Old 02-15-2020, 03:28 PM   #5
BaliDawg
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Join Date: Aug 2012
Location: Riverside, CA
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Quote:
Originally Posted by TR4G- View Post
when you tracked down your soft failing maf what gave it away? from my understanding, a soft failing MAF will underreport the amount of air coming in, so if you were to watch the fuel trims, they would become notciably more positive the higher the RPM correct?
Weve also seen a few over report. MAF value at warm idle is one data point, fuel trims another, swapping with a known working one is another data point that helps. Its tricky to isolate the problem to the MAF.
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