- Loose or corroded wire contacts to battery terminals (Section 1)
- Dead or defective battery (Section 5)
- Faulty loose or open wiring in the starter circuit (Section 5)
- Faulty traction relay or starter switch (Section 5)
Faulty starter (Section 5)
- Electric starter gear or flywheel teeth are loose or broken (Sections 2 and 5)
- Motor ground damaged or disconnected (Section 5)
Engine turns over but won't start
- Fuel tank empty
- Battery low (motor rotates slowly) (Section 5)
- Loose or corroded wire connections to battery terminals (Section 1)
- Worn, defective, or incorrectly gapped spark plugs (Section 1)
- Choke Mechanism Improperly Adjusted, Worn or Sticking - Carburetor Models (Section 4A)
- Damaged fuel shut-off valve winding - carburetor models (Section 4A).
- Damage to the Fuel Injection System - Fuel Injected Models (Section 4B).
- Major mechanical failure (e.g. camshaft drive) (Chapter 2A or 2B)
The engine is difficult to start from the anode state
- Battery low (Section 5)
- Loose or corroded wire connections to battery terminals (Section 1)
- Worn, defective, or incorrectly gapped spark plugs (Section 1)
- Choke Mechanism Improperly Adjusted, Worn or Sticking - Carburetor Models (Section 4A)
- Damage to the Fuel Injection System - Fuel Injected Models (Section 4B)
- Other damage to the ignition system (Sections 1 and 5)
- Low compression in the engine cylinders (Section 2A)
The engine is difficult to start when it is hot
- Air filter element dirty or clogged (Section 1)
- Choke Mechanism Improperly Adjusted, Worn or Sticking - Carburetor Models (Section 4A)
- Damage to the Fuel Injection System - Fuel Injected Models (Section 4B)
- Low compression in the engine cylinders (Section 2A)
Starter makes noise
- Electric starter gear or flywheel teeth are loose or broken (Sections 2 and 5)
- Starter mounting bolts loose or missing (Section 5)
- Internal starter components worn or damaged (Section 5)
Engine starts but immediately stalls
- Ignition circuit connectors loose or defective (Sections 1 and 5)
- Vacuum leak in carburetor body or intake manifold (Chapter 4A or 4B)
- Clogged jets or internal channels of the carburetor (Section 4A)
- Clogged Nozzle / Damaged Fuel Injection System - Fuel Injected Models (Section 4B)
Unstable operation in idle mode
- Clogged air filter element (Section 1)
- Vacuum leak in carburetor body, intake manifold or related hoses (Chapter 4A or 4B)
- Worn, defective, or incorrectly gapped spark plugs (Section 1)
- Unequal or low compression in the engine cylinders (Section 2A)
- Worn camshaft cams (Chapter 2A or 2B)
- Drive belt tensioned incorrectly (Chapter 2A or 2B)
- Clogged jets or internal channels of the carburetor (Section 4A)
- Clogged Nozzle/Damaged Fuel Injection System - Fuel Injected Models (Section 4B)
Misfiring at idle
- Worn, defective, or incorrectly gapped spark plugs (Section 1)
- Faulty high voltage spark plug wiring (Section 1)
- Vacuum leak in carburetor body, intake manifold or related hoses (Chapter 4A or 4B)
- Clogged jets or internal channels of the carburetor (Section 4A)
- Clogged Nozzle / Damaged Fuel Injection System - Fuel Injected Models (Section 4B)
- Distributor cap cracked (Section 1)
- Unequal or low compression in the engine cylinders (Section 2A)
- Disconnected or damaged crankcase ventilation hoses (Section 4A)
Misfiring throughout the entire speed range
- Clogged fuel filter (Section 1)
- Fuel pump defective or supply pressure low (Chapter 4A or 4B)
- Clogged fuel tank openings or fuel lines (Chapter 4A or 4B)
- Vacuum leak in carburetor body, intake manifold or related hoses (Chapter 4A or 4B)
- Worn, defective, or incorrectly gapped spark plugs (Section 1)
- Faulty high voltage spark plug wiring (Section 1)
- Distributor cap cracked (Section 1).
- Faulty ignition coil (Section 5)
- Unequal or low compression in the engine cylinders (Section 2A)
- Clogged jets or internal channels of the carburetor - carburetor models (Section 4A)
- Clogged Nozzle/Damaged Fuel Injection System - Fuel Injected Models (Section 4B).
Engine accelerates with a delay
- Worn, defective, or incorrectly gapped spark plugs (Section 1)
- Vacuum leak in carburetor body, intake manifold or related hoses (Chapter 4A or 4B)
- Clogged jets or internal channels of the carburetor (Section 4A)
- Clogged Nozzle / Damaged Fuel Injection System - Fuel Injected Models (Section 4B).
Engine stalls
- Vacuum leak in carburetor body, intake manifold or related hoses (Chapter 4A or 4B)
- Clogged fuel filter (Section 1)
- Fuel pump defective or supply pressure low (Chapter 4A or 4B)
- Clog fuel tank opening or fuel lines (Chapter 4A or 4B)
- Clogged jets or internal channels of the carburetor (Section 4A)
- Clogged Nozzle / Damaged Fuel Injection System - Fuel Injected Models (Section 4B)
Insufficient engine power
- Drive belt installed or tensioned incorrectly (Chapter 2A or 2B)
- Clogged fuel filter (Section 1)
- Fuel pump defective or supply pressure low (Chapter 4A or 4B)
- Unequal or low compression in the engine cylinders (Section 2A)
- Worn, defective, or incorrectly gapped spark plugs (Section 1)
- Vacuum leak in carburetor body, intake manifold or related hoses (Chapter 4A or 4B)
- Clogged jets or internal channels of the carburetor (Section 4A)
- Clogged Nozzle/Damaged Fuel Injection System - Fuel Injected Models (Section 4B)
- Wheel braking (Section 1 and Section 9)
- Clutch slip (Section 6)
The engine backfires
- Drive belt installed or tensioned incorrectly (Chapter 2A or 2B)
- Vacuum leak in carburetor body, intake manifold or related hoses (Chapter 4A or 4B)
- Clogged jets or internal channels of the carburetor (Section 4A)
- Clogged Nozzle/Damaged Fuel Injection System - Fuel Injected Models (Section 4B)
The oil pressure warning light comes on when the engine is running
- Low oil level or wrong type of oil filled (Section 1)
- Faulty oil pressure sensor (Section 12)
- Worn engine bearings and/or oil pump (Section 2A)
- High engine operating temperature (Section 3)
- Defective oil pressure relief valve (Section 2A)
- Clogged oil pump intake strainer (Section 2A)
Engine continues to run after shutdown
- Excessive soot in the engine (Section 2A)
- High engine operating temperature (Section 3)
- Faulty fuel cut-off valve (Section 4A)
- Damage to the Fuel Injection System - Fuel Injected Models (Section 4B).
Noises in the engine
Detonation or knocking during acceleration or when the vehicle is loaded
- Incorrect ignition timing / malfunction in the ignition system (Section 1)
- Wrong type spark plugs installed (Section 1)
- Filled with the wrong type of fuel (Section 4)
- Vacuum leak in carburetor body, intake manifold or related hoses (Chapter 4A or 4B)
- Excessive soot in the engine (Section 2A)
- Clogged jets or internal channels of the carburetor (Section 4A)
- Clogged Nozzle / Damaged Fuel Injection System - Fuel Injected Models (Section 4B)
Whistling or hissing sounds
- Leaking intake manifold or carburetor gasket (Chapter 4A or 4B)
- Leaking exhaust manifold gasket or exhaust pipe-to-manifold connection (Section 4C)
- Vacuum hose lets air through (Sections 4A, 4B, 4C, 5, 9 and 12)
- Burnt cylinder head gasket (Chapter 2A or 2B)
Light tapping or rattling
- Worn valve train or camshaft (Chapter 2A or 2B)
- Auxiliary components damaged (water pump, generator, etc) (Sections 3, 5 etc.)
Loud or dull thud
- Worn connecting rod bearings (regular loud knocking, possibly decreasing when the car is loaded) (Chapter 2A or 2B)
- Worn main bearings (loud knocking, possibly increasing when the car is loaded) (Chapter 2A or 2B)
- Piston damaged (most noticeable when the engine is cold) (Section 2A)
- Auxiliary components damaged (water pump, generator, etc) (Sections 3, 5 etc.)
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