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International Automotive Technicians Network
Re: misfire on cyl 5 at idle only
Posted to Technical Discussion Forum on 2/28/2020

Check the rear O2 when this happens if the rear O2 is lean it has to be a lack of fuel misfire if the misfire is mechanical or ignition related there will be no change in the rear O2 sensor reading due to the chemical reaction process of the cat.

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