Car engine (Peugeot Partner I)

The engine does not turn when trying to start

• The battery terminal connections are loose or damaged due to corrosion ("Weekly checks").
• The battery is discharged or faulty (chapter 5).
• The starting circuit wiring is broken, disconnected or poorly connected (chapter 5).
• Starter faulty (chapter 5).
• The teeth of the starter pinion or the flywheel/faceplate ring gear are worn or broken (chapters 2 and 5).
• The engine ground bus is broken or disconnected (Chapter 5 or 12).

The engine turns over but does not start

(Original is located at Peugeotbook.ru)

• The fuel tank is empty.
• The battery is discharged (the engine rotates slowly) (chapter 5).
• The battery terminal connections are loose or damaged due to corrosion ("Weekly checks").
• Worn, faulty or improperly adjusted spark plugs - gasoline engines (chapter 1).
• Pre/post heating system malfunction - diesel engines (chapter 5).
• The engine management system is faulty (chapter 4).
• Air in the fuel system - diesel engines (chapter 4).
• High Pressure Fuel System Malfunction - Diesel Engines (chapter 4).
• Low compression in cylinders (chapter 2).
• Serious mechanical failure (for example, a malfunction of the valve timing mechanism) (chapter 2).

Starting a cold engine is difficult

• The battery is discharged (chapter 5).
• The battery terminal connections are loose or damaged due to corrosion ("Weekly checks").
• Worn, faulty or improperly adjusted spark plugs - gasoline engines (chapter 1).
• Pre/post heating system malfunction - diesel engines (chapter 5).
• The engine management system is faulty (chapter 4).
• High Pressure Fuel System Malfunction - Diesel Engines (chapter 4).
• Low compression in cylinders (chapter 2).

Starting a warm engine is difficult

• The engine management system is faulty (chapter 4).
• High Pressure Fuel System Malfunction - Diesel Engines (chapter 4).
• Low compression in cylinders (chapter 2).

Increased noise or knocking when the starter is running

• The teeth of the starter gear or flywheel ring gear are worn or broken (chapters 2 and 5).
• The starter mounting bolts are loose or missing (chapter 5).
• Starter faulty (chapter 5).

The engine starts but immediately stalls

• Vacuum in the throttle body or in the intake manifold is broken - gasoline engines (chapter 4).
• The engine management system is faulty (Chapter 4).
• Air in the fuel system - diesel engines (chapter 4).
• High Pressure Fuel System Malfunction - Diesel Engines (chapter 4).

The engine runs unevenly when idling

• Throttle body/intake manifold vacuum is compromised - gasoline engines.
• Worn, faulty or improperly adjusted spark plugs - gasoline engines (chapter 1).
• The engine management system is faulty (chapter 4).
• Air in the fuel system - diesel engines (chapter 4).
• High Pressure Fuel System Malfunction - Diesel Engines (chapter 4).
• Inequality or low compression value in the cylinders (chapter 2).
• Wear of camshaft cams (chapter 2).
• Incorrect installation of the timing belt (chapter 2).

Misfires when the engine is idling

• Worn, faulty or improperly adjusted spark plugs - gasoline engines (chapter 1).
• Throttle body/intake manifold vacuum is compromised - gasoline engines (chapter 4).
• The engine management system is faulty (chapter 4).
• High Pressure Fuel System Malfunction - Diesel Engines (chapter 4).
• Inequality or low compression value in the cylinders (chapter 2).
• Disconnected, leaking or missing crankcase ventilation hoses - diesel engines (chapter 4)

Misfires during engine operation throughout the entire speed range

• The fuel filter is clogged (chapter 1).
• The fuel pump is faulty - gasoline engines (chapter 4).
• The fuel tank vent valve is clogged or the fuel flow through the fuel lines is obstructed (chapter 4).
• Worn, faulty or improperly adjusted spark plugs - gasoline engines (chapter 1).
• Throttle body/intake manifold vacuum is lost - gasoline engines (Chapter 4).
• The engine management system is faulty (chapter 4).
• High Pressure Fuel System Malfunction - Diesel Engines (chapter 4).
• Ignition coil faulty - petrol engines (chapter 5).
• Inequality or low compression value in the cylinders (chapter 2).

The engine runs rough when accelerating

• Worn, faulty or improperly adjusted spark plugs - gasoline engines (chapter 1).
• Throttle body/intake manifold vacuum is compromised - gasoline engines (chapter 4).
• The engine management system is faulty (chapter 4).
• High Pressure Fuel System Malfunction - Diesel Engines (chapter 4).

The engine stalls

• The fuel filter is clogged (chapter 1).
• The fuel pump is faulty - gasoline engines (chapter 4).
• The fuel tank vent valve is clogged or the fuel flow through the fuel lines is obstructed (chapter 4).
• Worn, faulty or improperly adjusted spark plugs - gasoline engines (chapter 1).
• Throttle body/intake manifold vacuum is compromised - gasoline engines (chapter 4).
• The engine management system is faulty (chapter 4).
• High Pressure Fuel System Malfunction - Diesel Engines (chapter 4).

Insufficient engine power

• Incorrect installation of the timing belt (chapter 2).
• The fuel filter is clogged (chapter 1).
• The fuel pump is faulty - gasoline engines (chapter 4).
• Inequality or low compression value in the cylinders (chapter 2).
• Worn, faulty or improperly adjusted spark plugs - gasoline engines (chapter 1).
• Throttle body/intake manifold vacuum is compromised - gasoline engines (chapter 4).
• The engine management system is faulty (chapter 4).
• High Pressure Fuel System Malfunction - Diesel Engines (chapter 4).
• Brake drag (chapter 1 and 9).
• Clutch slippage (chapter 6).

Engine popping sounds

• Incorrect installation of the timing belt (chapter 2).
• Throttle body/intake manifold vacuum is compromised - gasoline engines (chapter 4).
• The engine management system is faulty (chapter 4).

The oil pressure warning light comes on when the engine is running

• Low oil level or incorrect oil grade selected ("Weekly checks"),
• The oil pressure sensor is faulty (chapter 5).
• Worn engine bearings and/or oil pump (chapter 2).
• High engine operating temperature (chapter 3).
• The oil relief valve is faulty (chapter 2).
• The oil receiver filter is clogged (chapter 2).

The engine continues to run after the ignition is turned off

• Increased amount of carbon deposits in combustion chambers (chapter 2).
• High engine operating temperature (chapter 3).
• The engine management system is faulty (chapter 4).
• High Pressure Fuel System Malfunction - Diesel Engines (chapter 4).

Engine noises

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

• The engine management system is faulty (chapter 4).
• Incorrect spark plug type selected - gasoline engines (chapter 1).
• Fuel of the wrong grade - gasoline engines (chapter 4).
• Throttle body/intake manifold vacuum is compromised - gasoline engines (chapter 4).
• Increased amount of carbon deposits in combustion chambers (chapter 2).

Whistling or snorting sounds

• Intake Manifold or Throttle Body Gasket Leak - Gasoline Engines (chapter 4).
• Vacuum hose leak (chapter 9).
• The cylinder head gasket is blown (chapter 2).

Light tapping or rattling noises

• Wear of the valve mechanism or camshaft (chapter 2).
• Auxiliary equipment failure (coolant pump, generator, etc.) (chapters 3, 5 etc.).

Knocks or thuds

• Wear of the connecting rod lower end bearings (regular, strong impacts that may weaken under load) (chapter 2).
• Wear of main bearings (rumbling and impact noises that may increase under load) (chapter 2).
• Piston knocking (especially noticeable when the engine is cold; caused by wear of the piston/cylinder walls) (chapter 2).
• Auxiliary equipment failure (coolant pump, generator, etc.) (chapters 3, 5 etc.).