- Poorly secured or corroded battery contacts ("Weekly check").
- The battery is discharged or defective (chapter 5A).
- Open, disconnected or loose contacts in the starter circuit (chapter 5A).
- The starter solenoid or switch is faulty (chapter 5A). Starter faulty (chapter 5A)
- The electric starter gear or flywheel ring gear teeth are loose or broken (chapter 2 and 5A).
- Broken or disconnected engine ground jumper (chapter 5A).
The engine turns over but does not start
- Empty fuel tank.
- The battery is discharged (the engine is turning slowly) (chapter 5A).
- Poorly secured or corroded battery contacts ("Weekly check").
- The air filter is dirty or clogged (chapter 1).
- Low compression in cylinders (chapter 2).
- Serious mechanical failure (for example, camshaft drive) (chapter 2).
- Ignition system components are damp or damaged (chapter 5B).
- Fuel injection system malfunction (chapter 4).
- Worn, faulty or incorrectly gapped spark plugs (chapter 1).
- Open, disconnected or loose contacts in the ignition circuit (chapter 5B).
The engine does not start when cold
- Battery is low (chapter 5A).
- Poorly secured or corroded battery contacts ("Weekly check").
- The air filter is dirty or clogged (chapter 1).
- Worn, faulty or incorrectly gapped spark plugs (chapter 1).
- Low compression in engine cylinders (chapter 2).
- Fuel injection system malfunction (chapter 4).
- Ignition system malfunction (chapter 5B).
The engine does not start when hot
- Battery is low (chapter 5A).
- Poorly secured or corroded battery contacts ("Weekly check").
- The air filter is dirty or clogged (chapter 1).
- Fuel injection system malfunction (chapter 4).
Excessive noise when starting the starter
- The starter gear or flywheel ring gear teeth are loose or broken (chapter 2 or 5A).
- Loosening the starter mounting bolts (chapter 5A).
- The internal components of the starter are worn or damaged (chapter 5A).
The starter slowly turns the engine
- Battery is low (chapter 5A).
- Poorly secured or corroded battery contacts ("Weekly check").
- The ground wire is broken or the contact is broken (chapter 5A).
- Loose starter wires (chapter 5A).
- Internal starter failure (chapter 5A).
The engine starts and immediately stalls
- Open or loose contacts in the ignition circuit (chapter 5B).
- Fuel system contamination (chapter 4).
- Fuel injector failure (chapter 4).
- Fuel pump or pressure regulator faulty (chapter 4).
- Vacuum leak in the throttle body or in the intake manifold or hoses (chapter 4).
The engine runs rough at idle
- The air filter element is dirty or clogged (chapter 1).
- Air in the fuel system (chapter 4).
- Worn, faulty or incorrectly gapped spark plugs (chapter 1).
- Vacuum leak in the throttle body or in the intake manifold or hoses (chapter 4).
- Uneven or low compression in engine cylinders (chapter 2).
- Incorrect installation of the timing chain (chapter 2).
- Camshaft cam wear (chapter 2).
- Injector malfunction (chapter 4).
Ignition failures when the engine is idling
- Injector malfunction (chapter 4).
- Uneven or low compression in engine cylinders (chapter 2).
- Disconnection, leakage, or destruction of the rubber of the crankcase ventilation hoses of the crankshaft (chapter 4).
- Vacuum leak in the throttle body or in the intake manifold or hoses (chapter 4).
Ignition failures when the engine is running in the operating speed range
- The fuel filter is clogged (chapter 1).
- Malfunction or low fuel pump discharge pressure (chapter 4).
- The fuel tank ventilation system is clogged or the fuel line is pinched (chapter 4).
- Uneven or low compression in engine cylinders (chapter 2).
- Worn, faulty or incorrectly gapped spark plugs (chapter 1).
- The spark plug high voltage wires are faulty (chapter 1).
The engine stalls
- The fuel filter is clogged (chapter 1).
- Clogged injectors/malfunction of the fuel injection system (chapter 4).
- Malfunction or low fuel pump discharge pressure (chapter 4).
- Vacuum leak in the throttle body or in the intake manifold or hoses (chapter 4).
- The fuel tank ventilation system is clogged or the fuel line is pinched (chapter 4).
Insufficient engine power
- The fuel filter is clogged (chapter 1).
- Incorrect installation of the timing chain (chapter 2).
- Malfunction or low fuel pump discharge pressure (chapter 4).
- Worn, faulty or incorrectly gapped spark plugs (chapter 1).
- Vacuum leak in the throttle body or in the intake manifold or hoses (chapter 4).
- Uneven or low compression in engine cylinders (chapter 2),
- Brakes sticking (chapters 1 and 9).
- Clutch slippage (chapter 6).
- Clogged injectors/malfunction of the fuel injection system (chapter 4).
Backfires in the engine
- Incorrect installation of the timing chain (chapter 2).
- Clogged injectors/malfunction of the fuel injection system (chapter 4).
Low oil pressure indicator lights up when engine is running
- Low oil level or use of non-regulated oil type ("Weekly check").
- The oil pressure sensor is faulty (chapter 2).
- The engine bearings and/or oil pump are worn out (chapter 2).
- Engine operation at elevated temperature (chapter 3)
- The oil pressure relief valve is faulty (chapter 2).
- The mesh filter of the intake pipe is clogged (chapter 2).
Note: Low oil pressure on a high mileage engine is not unexpected. Much more dangerous is a sudden drop in oil pressure. In any case, check the oil pressure sensor and indicator first before repairing the engine.
The engine continues to rotate after being turned off
- Excessive contamination of internal engine parts with fuel residues (chapter 2).
- Engine operation at elevated temperature (chapter 3).
Engine noises
Pre-ignition (detonation) or knocking noise when accelerating or under load
- Excessive contamination of internal engine parts with fuel residues (chapter 2).
- Injector malfunction (chapter 4).
- Ignition system malfunction (chapter 5B).
Whistling or wheezing noises
- Exhaust manifold gasket leak (chapter 4).
- Vacuum hose leak (chapter 4).
- Cylinder head gasket failure (chapter 2).
Knocking or rattling noises
- Wear of the valve train or camshaft (chapter 2).
- Malfunction in auxiliary units (cooling system pump, generator, etc.) (chapters 3, 5 etc.).
Bangs or thuds
- Wear of lower connecting rod head bearings (regular loud knocking noise, possibly weakening under load) (chapter 2)
- Wear of main bearings (rattling and knocking, with possible weakening under load) (chapter 2).
- Piston relocation (can be heard on a cold engine) (chapter 2).
- Malfunction in auxiliary units (cooling system pump, generator, etc.) (chapters 3, 5 etc.).