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Your data logs tell me the following: Fuel trims are fine Here are some plots I generated from your data for both short-term and long-term fuel trims. The plot above (Bank 1 STFT vs Bank 2 STFT) show that there is no bank imbalance and most of the data points hover around zero STFT correction, which tells me that feedback from the O2 sensors is ...


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Fuel, Air and spark in the right amounts and at the right times are what makes an engine purr. In your car there is an engine computer that controls these things (unless you are talking pre 1983 or so...) Generally problems involving fuel will set an OnBoard Diagnostics (OBD) code. Air issues are not all that common, and generally come from a totally ...


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O2 sensors are interesting critters to diagnose. The ones at the upstream side of the Cats are the ones that send data to the ECM module continuously for keeping the air/fuel ratios optimum. The downstream O2 sensors for the most part do absolutely nothing throughout their service life. Their purpose is to monitor the condition of the Cats. If the Cats are ...



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