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Message Subject Question for the Auto Mechanics, Rotten Egg Smell *REVISITED* Pg 5
Poster Handle Anonymous Coward
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if bank 1 is detecting a false lean condition due to unmetered air, you'll see a big fluctuation in the reading on bank1o2 in freeze frame diagnostics. and was your pcm tune a mail order or real time tune?

*** you can also do a basic check if you have a good dtc reader. if your fuel trim is running greater than 10%, the computer is trying to compensate for something. one thing to remember here is that your car is supercharged. its better to run lean with boost than rich, so be careful running it hard until you get it straightened out. running rich with a boosted car opens up the opportunity for detonation...which is something you want to avoid like the plague.
 Quoting: BrokenTech




Always better to run rich no matter how it's boosted. Rich will give you some margin of safety. Lean will cause detonation / preignition issues. Lean is hot. Two strokes will seize if they go lean under (heavy) load / throttle.

Now, diesels on the other hand....
 Quoting: Anonymous Coward 73706403


Would that be detected with the knock sensor? If so, the knocks are zero.
 Quoting: BrokenTech


Should. Any pinging / detonation / preignition should be picked up by the knock sensor (if working properly) and the PCM will dial back ignition advance (and richen the mixture in some applications) until the pinging / detonation ceases. It will then immediately start dialing in more advance until the pinging / detonation resumes. This "dance" happens at hundreds of times per second, and will continue until modified parameters are set, or higher octane fuel is used. If the octane rating of the fuel is high enough (for the maximum programmed spark timing advance), this pinging / detonation will never occur.
 
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