Thread: Misfire Misery
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Old 06-08-2021, 11:33 PM
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upallnight upallnight is offline
Join Date: Aug 2012
Location: Cook County
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A misfire in a modern computer control engine is not the same as a misfire in an engine that has a carburetor and a distributor. Misfires in those old engines could be traced to spark plugs, ignition cable, point or distributor. A misfire in modern computer-controlled engines means the computer has detected that a cylinder or cylinders are not producing the same amount of power as other cylinders. The computer can see the crank rotational speed when the cylinder fires. Fuel trim data can provide you with an insight as to how the engine is performing. If the computer is adding fuel to the fuel trim, it means the cylinder(s) is running lean. You will not be able to detect this condition without a scanner that can provide real-time data. Unless you like throwing parts at the problem, I suggest that you bring it to a tech that knows what they are doing.
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