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. . . . . ... FAULT DIAGNOSIS SYMPTOM E N G I N E FAILS TO S T A R T E N G I N E STALLS LACK OF POWER ENGINE RUNS E R R A T I C A L L Y STARTS, B U T STOPS 'MMEDIATELY F A I L S T O I D L E MISFIRES O N A C C E L E R A T I O N KNOCKS BACKFIRES PETROL ENGINE FAULT DIAGNOSIS POSSIBLE CAUSE Incorrect starting procedure 2. Starter motor speed too slow 3. Faulty ignition system 4. Water o r dirt in fuel system 5 . flooding Defective fucl pump 7. Defective starter motor 8. Starter pinion not engaging Low idling speed 2. Faulty sparking plugs 4. distributor points 5. Incorrect mixture in fuel system Poor compression 2. Badly seating valves Faulty clcctrical connections 2. sparking plugs 3. Low charge 4. Dcfectivc distributor Faulty fuel pump 7. Sticking valves Defective valve springs 10. Worn valve guides o r valves 13. Vacuum pipes, disconnected at inlet manifold. distributor o r gearbox I . Faulty electrical connections 2. Foreign matter in fuel system Incorrect carburetter setting 2. Faulty fuel pump I . Distributor points incorrectly set 2. Faulty coil o r condenser Ignition timing advanced 2. Excessive carbon deposit 4 . Unsuitable fuel 5 . Worn pistons o r bearings Ignition defect 2. Carburetter defect Sticking valve 4. Weak valve springs 6. Excessively worn valve stems and guides 7. Excessive carbon deposit Incorrect sparking plug gap 9. Air in induction o r exhaust systems manifold See owners handbook each component in system Flush out system with clean fuel and overhaul Adjust or renew Adjust If the compression is appreciably less then figure, the piston rings or valves are faulty. Low pressure i n adjoining cylinders indicates a faulty cylinder head gasket or overhaul Determine which component and renew o f all ignition connections test and renew if necessary Recharge battery and test for condition overhaul source of dirt, and systcm and overhaul o r cylinder head timing with electronic equipment, if cylinder gaskets o r renew pipes HT for cracked insulation; check ow tension circuit source of matter and clean system overhaul o r renew as necessary overhaul o r renew cylinder to correct dwell angle tenew o r renew all vacuum Renew faulty using equipmcnt ignition timing suit octane rating engine capsule and re-check and if nccessary all ignition components and timing Overhaul cylinder head t and k n e w faulty gaskets or components 123 |