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You might have encountered such a situation when your vehicle was not started while you were in a hurry. It’s even worse when you don’t even know why it happened and you can’t do anything about it without knowing the reason. So take a moment to read this article today and spare yourself from such embarrassment.
| S.No | Common Troubles | Possible Causes |
| 1 | Engine does not turn over when starting | 1. Discharged battery 2. Open starting circuit 3. Jammed self starter 4. Jammed cranking drive 5. Jammed engine 6. Reasons listed under no 3 |
| 2 | Engine turns over slowly but does not start | 1. Discharged battery 2. Defective cranking motor 3. Bad connection in starting circuit 4 Undersized battery cables 5. Reasons listed under no 3 |
| 3 | Engine turns over at normal speed but does not start | 1. Defective ignition system 2. Defective or over-chocking fuel system 3. Air leakage in intake manifold or carburettor 4. Defective engine |
| 4 | Engine runs but misses one cylinder | 1. Defective spark plug 2. Defective distributor lead or cap 3. Stuck valve 4. Defective piston or rings 5. Defective head gasket |
| 5 | Engine runs but misses different cylinders | 1. Defective ignition. 2. Defective fuel system 3. Loss of compression 4 Defective valve action 5. Defective rings 6. Overheated engine 7. Sticking manifold heat control valve 8. Clogged exhaust |
| 6 | Engine lacks power, acceleration | 1. Defective ignition 2. Defective fuel system 3. Clogged exhaust 4. Excessive carbon in engine. 5. Defective valve action. 6. Excessive rolling resistance from low type pressure dragging brakes,, wheel misalignment, etc. 7. Heavy oil 8. Wrong or bad fuel. |
| 7 | Engine lacks power, acceleration or high performance at hot only | 1. Engine overheats 2. Defective choke 3. Sticking manifold- heat control valve 4. Vapour lock |
| 8 | Engine overheats | 1. Lack of coolant. 2. Late ignition timing. 3. Loose or broken fan belt. 4. Defective thermostat. 5. Clogged water jackets. 6. Defective radiator hose. 7. Defective water pump. 8. Insufficient engine oil. 9. High altitude,, hot climate operation. 10. Late valve timing. |
| 9 | Blue Smoke | Excessive oil consumption |
| 10 | Black Smoke | Excessive rich mixture |
| 11 | Excessive oil consumption | 1. Burning oil in combustion chamber 2. External leaks |
| 12 | Engine backfiring | 1. Ignition timing off 2. Spark plug of wrong heat range 3. Excessive rich or lean mixture 4. Overheating of engine 5. Carbon in engine 6. Valves hot or sticking 7. Cracked distributor cap. |
| 13 | Low oil pressure | 1. Defective lubricating system 2. Worn engine bearing 3. Oil dilution or foming 4. Engine overheating |
| 14 | Excessive fuel consumption | 1. Nervous driver 2. High speed 3. Short run operation 4. Excessive fuel pump pressure or pump leakage 5. Choke partly closed after warm-up 6. Clogged air cleaner 7. High carburettor float level 8. Stuck or dirty float needle valve 9. Worn carburettor jet 10. Stuck metering rod or full power piston 11. Idle too rich or too fast 12. Stuck accelerator pump check vlave 13. Carburettor leaks 14. Faulty ignition 15. Loss of engine compression 16. Defective valve action 17. Clutch slippage 18. Excessive rolling resistance from low tyre pressure, dragging brakes, wheel misalignment, etc |
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