Engine malfunctions (Mondeo 1 and 2)

Engine does not turn over when trying to start

• Poorly secured or corroded battery contacts (Chapter 5).
• The battery is discharged or defective (Chapter 5).
• Open, disconnected or loose contacts in the starter circuit (Chapter 5).
• The starter solenoid or switch is faulty (Chapter 5).
• Starter faulty (Chapter 5).
• The electric starter gear or flywheel ring gear teeth are loose or broken (Chapter 5).
• Broken or disconnected engine ground jumper (Chapter 5).
• Automatic transmission in gears other than "Park" or "Neutral" or selector malfunction (Chapter 7B).

The engine turns but does not start

• Empty fuel tank.
• Battery is discharged (engine turns slowly) (Chapter 5).
• Poorly secured or corroded battery contacts (Chapter 5).
• Ignition system components are faulty or damp - (Chapters 1, 5).
• Open, disconnected or loose contacts in the ignition circuit (Chapters 1, 5).
• Worn, faulty or incorrectly gapped spark plugs (Chapter 1).
• Serious mechanical failure (eg camshaft drive) (Chapter 2A).

The engine does not start when cold

• Battery is low (Chapter 5).
• Poorly secured or corroded battery contacts (Chapter 5).
• Worn, faulty or incorrectly gapped spark plugs (Chapter 1).
• Ignition system malfunction (Chapters 1, 5).
• Engine Management System Malfunction (Chapters 1, 4, 5, 6).
• Low compression in cylinders (Chapter 2A).

The engine does not start when hot

• The air filter element is dirty or clogged (Chapter 1).
• Engine Management System Malfunction (Chapters 1, 4, 5, 6).
• Low compression in cylinders (Chapter 2A).
• Malfunction of hydraulic valve clearance compensators (Chapter 2A).

Excessive noise when the starter is running or jerking when it engages

• The starter gear or flywheel ring gear teeth are loose or broken (Chapter 5).
• Loosening the starter mounting bolts (Chapter 5). The internal components of the starter are worn or damaged (Chapter 5).

The engine starts and immediately stalls

• Open or loose contacts in the ignition circuit (Chapters 1, 5).
• Engine Management System Malfunction (Chapters 1, 4, 5, 6).
• Intake Manifold Vacuum Leak (Chapter 1, 4, 6).

The engine runs rough at idle

• Idle speed control valve malfunction (Chapter 4).
• Engine Management System Malfunction (Chapters 1, 4, 5, 6).
• The air filter element is dirty or clogged (Chapter 1).
• Vacuum leak in the intake manifold or hoses connected to it (Chapter 1, 4, 6).
• Worn, faulty or incorrectly gapped spark plugs (Chapter 1).
• Malfunction of hydraulic valve clearance compensators (Chapter 2A).
• Uneven or low compression in engine cylinders (Chapter 2).
• Camshaft cam wear (Chapter 2).
• Incorrect setting of the timing belt tension (Chapter 2A).

Ignition failures when the engine is idling

• Worn, faulty or incorrectly gapped spark plugs (Chapter 1).
• Malfunction of high-voltage spark plug wires (Chapter 1).
• Idle speed control valve malfunction (Chapter 4).
• Incorrect ignition timing (Chapters 5, 6).
• Engine Management System Malfunction (Chapters 1, 4, 5, 6).
• Vacuum leak in the intake manifold or hoses connected to it (Chapter 1, 4, 6).
• Malfunction of hydraulic valve clearance compensators (Chapter 2A).
• Uneven or low compression in engine cylinders (Chapter 2).
• Disconnection, leakage, or destruction of the rubber of the crankcase ventilation hoses of the crankshaft (Chapters 1, 6).

Engine ignition failures 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).
• Vacuum leak in the intake manifold or hoses connected to it (Chapter 1, 4, 6).
• Worn, faulty or incorrectly gapped spark plugs (Chapter 1).
• Malfunction of high-voltage spark plug wires (Chapter 1).
• Ignition coil malfunction (Chapter 5),
• Engine Management System Malfunction (Chapters 1, 4, 5, 6).
• Uneven or low compression in engine cylinders (Chapter 2A).

The engine runs unsteadily during acceleration

• Worn, faulty or incorrectly gapped spark plugs (Chapter 1).
• Engine Management System Malfunction (Chapters 1, 4, 5, 6).
• Vacuum leak in the intake manifold or hoses connected to it (Chapter 1, 4, 6).

The engine stalls

• Idle speed control valve malfunction (Chapter 4).
• Engine Management System Malfunction (Chapters 1, 4, 5, 6),
• Vacuum leak in the intake manifold or hoses connected to it (Chapter 1, 4, 6).
• 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).

Insufficient engine power

• Incorrect ignition timing (Chapters 5, 6).
• Engine Management System Malfunction (Chapters 1, 4, 5, 6).
• Incorrect installation or incorrect tension of the timing belt (Chapter 2A).
• The fuel filter is clogged (Chapter 1).
• Malfunction or low fuel pump discharge pressure (Chapter 4).
• Uneven or low compression in engine cylinders (Chapter 2A).
• Worn, faulty or incorrectly gapped spark plugs (Chapter 1).
• Vacuum leak in the intake manifold or hoses connected to it (Chapter 1, 4, 6).
• Brakes sticking (Chapters 1 and 9).
• Clutch slippage (Chapter 8).
• Incorrect automatic transmission fluid level (Chapter 1).

The engine continues to rotate after being turned off

• Excessively high idle speed (Chapters 4, 6).
• Engine Management System Malfunction (Chapters 1, 4, 5, 6).
• Excessive contamination of internal engine parts with fuel residues (Chapter 2A).
• Engine operation at elevated temperature (Chapter 3).

Backfires in the engine

• Incorrect ignition timing (Chapters 5, 6).
• Engine Management System Malfunction (Chapters 1, 4, 5, 6).
• Incorrect installation or incorrect tension of the timing belt (Chapter 2A).
• Vacuum leak in the intake manifold or hoses connected to it (Chapter 1, 4, 6).

Low oil pressure indicator lights up when engine is running

• Low oil level or use of non-regulated oil type (Chapter 1).
• The oil pressure sensor is faulty (Chapter 2A).
• 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 2A),
• The mesh filter of the intake pipe is clogged (Chapter 2A).

Engine noises

Pre-ignition (detonation) or knocking noise when accelerating or under load

• Incorrect ignition timing (Chapters 5, 6).
• Fuel of the wrong grade (Chapter 4).
• Vacuum leak in the intake manifold or hoses connected to it (Chapter 1, 4, 6).
• Excessive contamination of internal engine parts with fuel residues (Chapter 2A).

Whistling or wheezing noises

• Intake Manifold Gasket Leak (Chapter 2A).
• Leak through the exhaust manifold gasket or the manifold-to-header pipe joint (Chapter 1, 2A, 4).
• Vacuum Hose Leak (Chapters 1, 4, 6, 9).
• Cylinder head gasket failure (Chapter 2A).

Knocking or rattling noises

• Malfunction of hydraulic valve clearance compensators (Chapter 2A).
• Wear of the valve train or camshaft (Chapter 2A).
• Wear of the timing belt or its tensioner (Chapter 2A).
• Malfunction in auxiliary units (cooling system pump, generator, etc.) (Chapters 3, 5 etc.).

Knocks or thuds

• Wear of connecting rod bearings (regular strong knocking, with possible weakening under load) (Chapter 2B).
• Wear of main bearings (rattling and knocking, with possible weakening under load) (Chapter 2B).
• Piston shifting (audible on a cold engine) (Chapter 2B).
• Malfunction in auxiliary units (cooling system pump, generator, etc.) (Chapters Chapters 3, 5 etc.).