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List of 19 Major Car Engine Problems and Their Possible Causes

In this article, you’ll learn what are the different Car Engine Problems and Their Possible Causes. If you found this helpful please let us know in the comments.

Car Engine Problems

This post deals with various engine troubles and their causes. The remedies of these troubles are not given because they are self-understood according to the causes. Some of the major troubles of scooters, cars and tractors are also elaborated with their causes.

Engine problems
Source: miway

List of Car Engine Problems

Following are the major car engine problems:

TroublesPossible Causes
1. Engine does not turn over when starting is attempted1. Discharged battery
2. Open starting circuit
3. Jammed Bendix drive
4. Jammed cranking drive
5. Jammed engine
6. Also causes listed under item 3
2. Engine turns over slowly but does not start1. Discharged battery
2. Defective cranking motor
3. Bad connection in starting circuit
4. Undersized battery cables
5. Also, causes listed under item 3
3. Engine turns over at normal speed but does not start1. Defective battery system
2. Defective or over-chocking fuel system
3. Air leakage in the 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 cylinders1. 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 or high speed performance or hot or cold1. Defective ignition
2. Defective fuel system
3. Clogged exhaust
4. Throttle valve not opening fully
5. Loss of compression
6. Excessive carbon in the engine
7. Defective valve action
8. Excessive rolling resistance from low type pressure, dragging brakes, wheel misalignment, etc.
9. Heavy oil
10. Wrong or bad fuel
7. Engine lacks power, acceleration or high speed performance, hot only1. Engine overheats
2. Defective choke
3. Sticking manifold heat control valve
4. Vapour lock
8. Engine lacks power, acceleration, or high speed performance, cold only1. Stuck automatic choke
2. Stuck manifold heat control valve
3. Stuck cooling system thermostat
4. Stuck engine valves
9. Engine over heats1. Lack of water
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
10. Rough idle1. Incorrect carburettor idle adjustment
2. Malfunctioning crankcase ventilator valve on closed crankcase ventilating system
3. Also, causes listed under items 6, 7 and 8
11. Engine stalls cold or as it warms up1. Closed choke valve
2. Fuel not getting to or through carburettor
3. Manifold heat-control valve stuck
4. Engine overheats
5. Too low setting of idling speed
12. Engine stalls after idling or speed driving slow1. Defective fuel pump
2. Overheating
3. High carburettor float level
4. Incorrect idling adjustment
13. Engine stalls after high speed driving1. vapour lock
2. Defective carburettor ventilating or idle compensator valve
3. Engine overheats
14. Engine backfires1. 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
15. Smoky exhaust:
a. Blue smoke
b. Black smoke
1. Excessive oil consumption
2. Excessive rich mixture
16. Excessive oil consumption:a. External leaks
b. burning oil in combustion chamber
17. Low oil pressure:1. Worn engine bearing
2. Engine overheating
3. Oil dilution or foaming
4. Defective lubrication system
18. 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 warn-up
6. Clogged air cleaner
7. High carburettor float level
8. Stuck or dirty float needle value.
9. Worn carburettor jet
10. Stuck metering rod or full power piston.
11. Idle too rich or too fast
12. stuck accelerator-pump check value
13. carburettor leaks
14. faulty ignition
15. Loss of engine compression
16. Defective value action
17. Clutch slippage
18. Excessive rolling resistance from low pressure, Dragging brakes, wheel misalignment, etc.
19. Engine is noisy
1. Regular clicking
2. Ping or chatter on load or acceleration
3. A light knock or pound with engine floating
4. Light metallic double knock usually most audible during idle.
5. Chattering or ratting during acceleration.
6. Hollow muffled, belt-like sound, engine cold.
7. Dull, heavy, metallic knock under load or acceleration, especially, when cold.
8. Miscellaneous noises
1. Value and tappet noise
2. Spark knock due to low octane fuel carbon advance ignition timing. Also, causes listed under item 14
3. Worn connecting rod bearing or crankpin, misaligned rod, lack of oil
4. Worn or loose piston pin or lack of oil
5. Worn rings, cylinder walls low ring tension, broken rings
6. Piston slap due to worn pistons, walls, collapsed piston skirts, excessive clearance lack of oil, misaligned connecting rods.

7. Regular noise, worn main bearings, irregular, worn end thrust bearings.
8. Rattles, etc., from loosely mounted accessories, generator horn, oil pan, etc.

That’s it, thanks for reading. If you have any questions about “Car Engine Problems” ask in the comments I’ll respond to you. If you like this article then please share with your friends.

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About Saif M

Saif M. is a Mechanical Engineer by profession. He completed his engineering studies in 2014 and is currently working in a large firm as Mechanical Engineer. He is also an author and editor at www.theengineerspost.com

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