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2Watch this video and the second. It will help alot, the guy is a good teacher.
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22001LSHoe replied to the thread Possible Vacuum Leak, With Graphs.Fuel trims from cold start overnight with 30 Minute drive at near constant speed and incredibly flat.
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22001LSHoe replied to the thread Possible Vacuum Leak, With Graphs.Below are graphs of the rear o2 sensors… is this an indication that the cats are going out?
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22001LSHoe replied to the thread Possible Vacuum Leak, With Graphs.I did new plugs and wires, fuel filter and cleaned MAF all within the last year. I initially had this issue last winter on a morning...
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22001LSHoe replied to the thread Possible Vacuum Leak, With Graphs.Yes, after it warms up all the fuel trims are +/- within 10% and very rarely outside of 5%. In fact, the only time I see the fuel trim...
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2Thinking I have a vacuum leak. I get the really high STFT only on startup after leaving it sit overnight. It causes random misfires. It...
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