Common in older BMW engines, often caused by worn gaskets and seals.

Can be due to a failing water pump, clogged radiator, or a stuck thermostat.

Wear and tear over time can lead to timing belt or chain failure, affecting engine performance.

Issues with spark plugs, ignition coils, or distributor cap can cause misfires or poor engine performance.

Cracked or brittle vacuum hoses can cause rough idling or stalling.

Problems with the fuel pump, fuel injectors, or fuel filter can lead to poor engine performance or starting issues.

Radiator, hoses, or coolant reservoir problems can cause coolant leaks and engine overheating.

Can lead to oil leaks and contamination of the ignition system.

Can cause incorrect air-fuel mixture, leading to poor engine performance and fuel economy.

Can cause engine stalling or failure to start.

The 1990 BMW 325iS, especially with its six-cylinder engine, is prone to oil leaks from the valve cover gasket, oil pan gasket, and rear main seal.

The cooling system, including the radiator, water pump, and thermostat, can often fail, leading to overheating issues.

The timing belt or chain might wear out or fail, causing significant engine damage if not replaced or maintained properly.

Vacuum leaks can cause rough idling, stalling, or poor engine performance, often due to aging hoses and gaskets.

Issues with the ignition coil, spark plugs, and distributor can lead to misfires or poor engine performance.

Fuel pump or fuel injector failures can lead to engine stalling, poor acceleration, and difficulty starting.

A faulty MAF sensor can cause incorrect air-fuel mixture leading to poor fuel economy and performance.

A failing crankshaft position sensor can cause the engine to stall or fail to start.

The 1990 BMW 325iS, especially with its six-cylinder engine, is prone to oil leaks from the valve cover gasket, oil pan gasket, and rear main seal.

The cooling system, including the radiator, water pump, and thermostat, can often fail, leading to overheating issues.

The timing belt or chain might wear out or fail, causing significant engine damage if not replaced or maintained properly.

Vacuum leaks can cause rough idling, stalling, or poor engine performance, often due to aging hoses and gaskets.

Issues with the ignition coil, spark plugs, and distributor can lead to misfires or poor engine performance.

Fuel pump or fuel injector failures can lead to engine stalling, poor acceleration, and difficulty starting.

A faulty MAF sensor can cause incorrect air-fuel mixture leading to poor fuel economy and performance.

A failing crankshaft position sensor can cause the engine to stall or fail to start.

The 1990 BMW 325i is known for developing oil leaks, especially from the valve cover gasket and oil pan gasket.

The cooling system can be problematic, with common issues including a failing water pump, radiator, or thermostat which can lead to overheating.

The timing belt on the 1990 BMW 325i needs regular replacement as it can wear out and potentially break, causing major engine damage.

Vacuum leaks are common and can cause rough idling, poor fuel economy, and performance issues.

The fuel pump may fail over time, leading to starting issues or engine stalling.

Older BMW models like the 325i often experience electrical issues, such as with the alternator, battery, or wiring.

Problems with the ignition system, such as worn spark plugs or a faulty ignition coil, can lead to misfires and poor engine performance.

The MAF sensor can become dirty or fail, causing erratic engine performance and poor fuel efficiency.

Older BMW engines, including those from the 1990s, are prone to oil leaks due to deteriorating gaskets and seals.

The cooling systems in older BMW models can be problematic, often due to failing water pumps, radiators, or thermostat issues.

The timing belt or chain may wear out or fail, leading to poor engine performance or even catastrophic engine damage.

Vacuum hoses and intake manifold gaskets can deteriorate over time, leading to air leaks that affect engine performance.

Fuel injectors can become clogged or fail, leading to poor fuel delivery and engine misfires.

Components like spark plugs, ignition coils, and distributor caps can wear out, leading to misfires and poor engine performance.

Over time, carbon deposits can build up in the intake manifold and on the valves, affecting engine efficiency and performance.

Sensors such as the oxygen sensor, mass airflow sensor, and crankshaft position sensor can fail, leading to poor engine performance and fuel efficiency.

The BMW 325iS from 1990 often suffers from oil leaks due to aging gaskets and seals, particularly around the valve cover and oil pan.

Issues with the radiator, water pump, and thermostat are common, leading to engine overheating.

The timing belt and tensioner can wear out, potentially causing engine misfires or catastrophic failure if not replaced at regular intervals.

Problems with the fuel injectors or fuel pump can lead to poor engine performance or starting issues.

Leaks in the vacuum system can cause rough idling or stalling.

Aging wiring and connectors can lead to various electrical problems, including issues with the engine control unit (ECU).

The 1990 BMW 325iS, especially with its six-cylinder engine, is prone to oil leaks from the valve cover gasket, oil pan gasket, and rear main seal.

The cooling system, including the radiator, water pump, and thermostat, can often fail, leading to overheating issues.

The timing belt or chain might wear out or fail, causing significant engine damage if not replaced or maintained properly.

Vacuum leaks can cause rough idling, stalling, or poor engine performance, often due to aging hoses and gaskets.

Issues with the ignition coil, spark plugs, and distributor can lead to misfires or poor engine performance.

Fuel pump or fuel injector failures can lead to engine stalling, poor acceleration, and difficulty starting.

A faulty MAF sensor can cause incorrect air-fuel mixture leading to poor fuel economy and performance.

A failing crankshaft position sensor can cause the engine to stall or fail to start.

The 1990 BMW 325iS, especially with its six-cylinder engine, is prone to oil leaks from the valve cover gasket, oil pan gasket, and rear main seal.

The cooling system, including the radiator, water pump, and thermostat, can often fail, leading to overheating issues.

The timing belt or chain might wear out or fail, causing significant engine damage if not replaced or maintained properly.

Vacuum leaks can cause rough idling, stalling, or poor engine performance, often due to aging hoses and gaskets.

Issues with the ignition coil, spark plugs, and distributor can lead to misfires or poor engine performance.

Fuel pump or fuel injector failures can lead to engine stalling, poor acceleration, and difficulty starting.

A faulty MAF sensor can cause incorrect air-fuel mixture leading to poor fuel economy and performance.

A failing crankshaft position sensor can cause the engine to stall or fail to start.

The 1990 BMW 325iS, especially with its six-cylinder engine, is prone to oil leaks from the valve cover gasket, oil pan gasket, and rear main seal.

The cooling system, including the radiator, water pump, and thermostat, can often fail, leading to overheating issues.

The timing belt or chain might wear out or fail, causing significant engine damage if not replaced or maintained properly.

Vacuum leaks can cause rough idling, stalling, or poor engine performance, often due to aging hoses and gaskets.

Issues with the ignition coil, spark plugs, and distributor can lead to misfires or poor engine performance.

Fuel pump or fuel injector failures can lead to engine stalling, poor acceleration, and difficulty starting.

A faulty MAF sensor can cause incorrect air-fuel mixture leading to poor fuel economy and performance.

A failing crankshaft position sensor can cause the engine to stall or fail to start.

Older BMW engines, including those from the 1990s, are prone to oil leaks due to deteriorating gaskets and seals.

The cooling systems in older BMW models can be problematic, often due to failing water pumps, radiators, or thermostat issues.

The timing belt or chain may wear out or fail, leading to poor engine performance or even catastrophic engine damage.

Vacuum hoses and intake manifold gaskets can deteriorate over time, leading to air leaks that affect engine performance.

Fuel injectors can become clogged or fail, leading to poor fuel delivery and engine misfires.

Components like spark plugs, ignition coils, and distributor caps can wear out, leading to misfires and poor engine performance.

Over time, carbon deposits can build up in the intake manifold and on the valves, affecting engine efficiency and performance.

Sensors such as the oxygen sensor, mass airflow sensor, and crankshaft position sensor can fail, leading to poor engine performance and fuel efficiency.

The 1990 BMW 325i is known for developing oil leaks, especially from the valve cover gasket and oil pan gasket.

The cooling system can be problematic, with common issues including a failing water pump, radiator, or thermostat which can lead to overheating.

The timing belt on the 1990 BMW 325i needs regular replacement as it can wear out and potentially break, causing major engine damage.

Vacuum leaks are common and can cause rough idling, poor fuel economy, and performance issues.

The fuel pump may fail over time, leading to starting issues or engine stalling.

Older BMW models like the 325i often experience electrical issues, such as with the alternator, battery, or wiring.

Problems with the ignition system, such as worn spark plugs or a faulty ignition coil, can lead to misfires and poor engine performance.

The MAF sensor can become dirty or fail, causing erratic engine performance and poor fuel efficiency.

The 1990 BMW 325iS, especially with its six-cylinder engine, is prone to oil leaks from the valve cover gasket, oil pan gasket, and rear main seal.

The cooling system, including the radiator, water pump, and thermostat, can often fail, leading to overheating issues.

The timing belt or chain might wear out or fail, causing significant engine damage if not replaced or maintained properly.

Vacuum leaks can cause rough idling, stalling, or poor engine performance, often due to aging hoses and gaskets.

Issues with the ignition coil, spark plugs, and distributor can lead to misfires or poor engine performance.

Fuel pump or fuel injector failures can lead to engine stalling, poor acceleration, and difficulty starting.

A faulty MAF sensor can cause incorrect air-fuel mixture leading to poor fuel economy and performance.

A failing crankshaft position sensor can cause the engine to stall or fail to start.