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Incorrect ignition timing Reset ignition timing, See TUNE-UP Leaking valves Replace valves, See ENGINES Worn fuel pump diaphragm Replace diaphragm or or piston piston Intake Backfire Improper ignition timing Reset ignition timing, See TUNE-UP Faulty accelerator pump Replace accelerator discharge pump Improper choke operation Check choke and adjust as required Defective EGR valve Replace EGR valve Fuel mixture too lean Reset air/fuel mixture, See TUNE-UP Choke valve initial Reset choke valve clearance too large initial clearance Exhaust Backfire Vacuum leak Inspect and repair vacuum system Faulty vacuum diverter Replace vacuum diverter valve valve Faulty choke operation Check choke and adjust as required Exhaust system leak repair exhaust system leak Engine Ignition timing too far Reset ignition timing, Detonation advanced See TUNE-UP Faulty ignition system Check ignition timing, See TUNE-UP Spark plugs loose or Retighten or replace faulty plugs Fuel delivery system Inspect lines, pump and clogged filter for clog EGR valve inoperative Replace EGR valve PCV system inoperative Inspect and/or replace hoses or valve Vacuum leaks Check vacuum system and repair leaks Excessive combustion chamber deposits Remove built-up deposits Leaking, sticking or Inspect and/or replace broken valves valves External Oil Fuel pump improperly seated Remove pump, replace Leakage or worn gasket gasket and seat properly Oil pan gasket broken or Straighten pan and pan bent replace gasket Timing chain cover gasket Replace timing chain broken cover gasket Rear main oil seal worn Replace rear main oil seal Oil pan drain plug not Remove and reinstall seated properly drain plug Camshaft bearing drain Remove restriction hole blocked Oil pressure sending Remove and reinstall switch leaking sending switch |