Just bought a 98 s-10. check engine light was on. code po300 Changed ignition componets, still had po300 changed injectors, and now still have code po300 & now it backfires from exhaust and missfires

Asked by Feb 08, 2017 at 10:13 PM about the Chevrolet S-10

Question type: Maintenance & Repair

1 Answer

79,195

P0300 CHEVROLET - Cylinder Misfire Detected Random Cylinders.....Possible causes; Faulty spark plug (s), Faulty ignition coil (s), Clogged or faulty fuel injector (s), Intake air leak, Fuel injectors harness is open or shorted, Fuel Injectors circuit poor electrical connection, Ignition coils harness is open or shorted, Ignition coils circuit poor electrical connection, Insufficient cylinders compression, Incorrect fuel pressure...The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. If no leak are found the next step is to replace the spark plugs. If the problem persist more tests needs to be done to diagnose problem......Check this video out.....https://youtu.be/QdWd68bVm30

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