my auto scanner PO305, backfire #5 cylinder, fix ?


Asked by Mar 02, 2016 at 11:01 AM about the 1999 Buick LeSabre Limited

Question type: Maintenance & Repair

how do repair this reading?
like replace O2 sensor or complete tune-up.
1999 Buick LeSaber CU + 100K miles

1 Answer


P0305 BUICK - Cylinder 5 Misfire Detected... Possible causes...> - Faulty spark plug 5 - Clogged or faulty fuel injector 5 - Faulty ignition coil 5 - Fuel injector 5 harness is open or shorted - Fuel injector 5 circuit poor electrical connection - Ignition coil 5 harness is open or shorted - Ignition coil 5 circuit poor electrical connection - Insufficient cylinder 5 compression - Incorrect fuel pressure - Intake air leak.... Some Tech notes... The P0305 code means that the cylinder 5 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 5. If the problem persist more tests needs to be done to diagnose problem... Engine Cylinder 5 is Misfiring... Possible symptoms... - Engine Light ON (or Service Engine Soon Warning Light) - Lack/loss of power - Hard start - Engine hesitation

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