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Dirty MAF as RPM increase

  • karim
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8 years 1 month ago #12151 by karim
Dirty MAF as RPM increase was created by karim
Dears,

In Section 4 page 19 of scannerdanner book, showing info of a car having a dirty maf because as we raise up the rpm, LTFT and STFT rise. The question is

Why the Dirty MAF affected only one Bank according to this example of the book?
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8 years 1 month ago #12155 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Dirty MAF as RPM increase
The total fuel trim on both banks is way above normal. Normally for each bank STF+LTF should not exceed 10%
Any relatively difference between each bank could be due to any number of issues -- such a partially choked cat on one bank or a cylinder with a low compression.
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
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8 years 1 month ago #12211 by ScannerDanner
Replied by ScannerDanner on topic Dirty MAF as RPM increase
Both banks are affected. LTFT is 17.2 on bank 1 and 21.9 on bank 2.
Remember also this is one data frame on the scan tool.
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Don't be a parts changer!
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