Most Common Car Issues

Selected parameters

Add more parameters

Brake System Type

Engine Brake (hp) From

Engine Brake (hp) To

Engine Configuration

Engine Manufacturer

Engine Number of Cylinders

Make

Model

MOST COMMON PROBLEMS

TOYOTA 4-Runner 2002

This 2002 Toyota 4Runner is a versatile SUV featuring a robust 3.4L V6 engine with a power output ranging from 183 to 190 hp. Equipped with 4WD, this vehicle is designed to handle various terrains efficiently. Manufactured in Japan, specifically in Tokyo by Hino Motors, LTD., it boasts the reliable 5VZ-FE engine model. With a spacious interior and the SR5 trim, it's an ideal choice for both everyday driving and off-road adventures.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4-Runner is a robust SUV designed with versatility in mind, featuring a 3.4-liter V6 engine that produces between 183 to 190 horsepower. Its 4WD drive type ensures excellent off-road capability, while the V-Shaped engine configuration and water cooling type enhance performance and reliability. Built in Toyota's Tahara plant in Japan, this SR5 trim model offers a practical and dependable option for those seeking a multipurpose passenger vehicle.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4-Runner SR5 is a robust SUV designed for versatility and capability. Featuring a 3.4-liter V6 engine, this 4-wheel drive vehicle offers a power range of 183 to 190 horsepower. Manufactured by Toyota Motor Corporation in their Tahara Plant, Japan, it provides a sturdy build with a wagon body style and a spacious interior. Ideal for both city driving and off-road adventures, it's a reliable choice for those seeking a multipurpose passenger vehicle.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4-Runner Limited is a versatile SUV equipped with a 3.4L V6 engine delivering up to 190 hp. Manufactured in Tahara, Japan, this 4WD vehicle is designed for both rugged terrains and comfortable city driving. With its 4-door configuration and a gross vehicle weight rating of up to 6,000 lbs, it offers both performance and practicality.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4Runner Limited is a versatile SUV powered by a V-Shaped 3.4L engine, delivering between 183 to 190 hp. With 4WD capability and a robust build, it is designed for both on-road comfort and off-road adventures. Manufactured in the Tahara Plant in Japan, this model is part of the VZN180L/VZN185L series and carries the reliability Toyota is known for.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4Runner Limited is a versatile SUV with a V6 3.4L engine, producing 183-190 horsepower. It features a 4WD drivetrain, ideal for off-road adventures. Manufactured in Tokyo, Japan by Toyota Motor Corporation, this model boasts a robust build and reliable performance.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4-Runner SR5 is a robust SUV equipped with a 3.4L V6 engine (5VZ-FE) producing 183-190 horsepower. It features four-wheel drive and a spacious wagon body style with four doors. Manufactured by Toyota at the Tahara Plant in Japan, this model is designed for both utility and passenger comfort. It falls within the Class 1D Gross Vehicle Weight Rating, making it a versatile and reliable choice for various driving conditions.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4Runner SR5 is a versatile SUV equipped with a 3.4L V6 engine, producing between 183 to 190 horsepower. This 4WD vehicle is manufactured in Hamura, Japan by Toyota Motor Corporation. It offers a robust build with a gross vehicle weight rating from 5,001 to 6,000 pounds, making it ideal for various terrains and purposes.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4Runner SR5 is a versatile SUV powered by a 3.4L V6 engine (5VZ-FE) producing between 183 and 190 horsepower. This 4WD vehicle is designed for both on-road comfort and off-road capability, thanks to its robust build and water-cooled engine. Manufactured by Toyota Motor Corporation in Hamura, Japan, it features a wagon body style with a gross vehicle weight rating from 5,001 to 6,000 lbs. The 4Runner SR5 is well-regarded for its reliability and performance.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA Tacoma 2002

The 2002 Toyota Tacoma is a robust pickup truck featuring a 3.4L V6 engine with 190 hp, manufactured by Toyota Motor Manufacturing in California. This 4WD Extra Cab model is part of the RZN171L/VZN170L series, offering a Deluxe trim. With a hydraulic brake system and a gross vehicle weight rating of Class 1D, it's built for reliability and performance. Its production took place at the NUMMI plant in Fremont, USA.

Spec:

Brake System Type

Hydraulic

Engine Brake (hp) From

190

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Brake fluid leaks

Hydraulic brake systems rely on fluid to operate. Leaks in lines, hoses, or master cylinder can cause reduced braking efficiency.

Brake pedal sponginess

Air in the hydraulic lines can cause the brake pedal to feel spongy and reduce braking performance.

Brake master cylinder failure

A failing master cylinder can lead to inconsistent or complete loss of braking power.

Brake caliper issues

Calipers can seize or leak, leading to uneven braking or reduced braking power.

Brake rotor warping

Overheating or uneven wear can cause brake rotors to warp, leading to vibrations during braking.

Brake pad wear

Worn brake pads can reduce braking efficiency and increase stopping distances.

Brake line corrosion

Corrosion of brake lines can lead to leaks and potential brake failure.

Engine overheating

The 5VZ-FE engine may experience overheating issues due to cooling system problems such as a failing thermostat or radiator.

Head gasket failure

Common in older engines, this can lead to coolant leaks, engine overheating, and loss of compression.

Timing belt failure

The 5VZ-FE engine uses a timing belt that needs regular replacement. Failure can result in severe engine damage.

Oil leaks

Common oil leak points include the valve cover gaskets and oil pan gasket.

Fuel injector problems

Dirty or failing fuel injectors can cause rough idling, poor acceleration, and reduced fuel efficiency.

Ignition coil failure

Faulty ignition coils can cause misfires, rough idling, and poor engine performance.

Throttle body issues

Carbon buildup on the throttle body can lead to poor throttle response and stalling.

Oxygen sensor failure

Faulty oxygen sensors can cause poor fuel economy and increased emissions.

Exhaust manifold cracks

Cracks in the exhaust manifold can cause exhaust leaks, increased noise, and reduced engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4-Runner SR5 is a versatile SUV with a 3.4L V6 engine (5VZ-FE) producing between 183 to 190 hp. It features a 4WD drivetrain and seats four, making it perfect for both on-road and off-road adventures. Manufactured in Tahara, Japan, this model falls under the Class 1D weight rating and uses gasoline as its primary fuel.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA Tacoma 2002

The 2002 Toyota Tacoma Deluxe Extra Cab, manufactured by Toyota Motor Manufacturing in California, is a robust pickup truck. Equipped with a 3.4L V6 engine (5VZ-FE) producing 190 hp, it features a hydraulic brake system and a 4x2 drive type. This model sits within the Class 1D weight rating and boasts an extra-long wheelbase for enhanced stability and cargo capacity. Built in Fremont, California, this Tacoma exemplifies Toyota's reliability and performance.

Spec:

Brake System Type

Hydraulic

Engine Brake (hp) From

190

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Brake fluid leaks

Hydraulic brake systems rely on fluid to operate. Leaks in lines, hoses, or master cylinder can cause reduced braking efficiency.

Brake pedal sponginess

Air in the hydraulic lines can cause the brake pedal to feel spongy and reduce braking performance.

Brake master cylinder failure

A failing master cylinder can lead to inconsistent or complete loss of braking power.

Brake caliper issues

Calipers can seize or leak, leading to uneven braking or reduced braking power.

Brake rotor warping

Overheating or uneven wear can cause brake rotors to warp, leading to vibrations during braking.

Brake pad wear

Worn brake pads can reduce braking efficiency and increase stopping distances.

Brake line corrosion

Corrosion of brake lines can lead to leaks and potential brake failure.

Engine overheating

The 5VZ-FE engine may experience overheating issues due to cooling system problems such as a failing thermostat or radiator.

Head gasket failure

Common in older engines, this can lead to coolant leaks, engine overheating, and loss of compression.

Timing belt failure

The 5VZ-FE engine uses a timing belt that needs regular replacement. Failure can result in severe engine damage.

Oil leaks

Common oil leak points include the valve cover gaskets and oil pan gasket.

Fuel injector problems

Dirty or failing fuel injectors can cause rough idling, poor acceleration, and reduced fuel efficiency.

Ignition coil failure

Faulty ignition coils can cause misfires, rough idling, and poor engine performance.

Throttle body issues

Carbon buildup on the throttle body can lead to poor throttle response and stalling.

Oxygen sensor failure

Faulty oxygen sensors can cause poor fuel economy and increased emissions.

Exhaust manifold cracks

Cracks in the exhaust manifold can cause exhaust leaks, increased noise, and reduced engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4Runner SR5 is a robust SUV with a 3.4L V6 engine, producing between 183-190 hp. It features 4WD capabilities and a wagon body style, making it versatile for both on-road and off-road adventures. Manufactured in Tahara, Japan, this vehicle is a testament to Toyota's commitment to quality engineering.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4-Runner Limited is a versatile SUV with a 3.4L V6 engine, producing between 183 to 190 horsepower. It features 4WD and is built in Hamura, Tokyo, by Hino Motors. This model is known for its robust build and reliability, making it a popular choice among off-road enthusiasts.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4Runner SR5 is a versatile SUV with a 3.4L V6 engine, producing between 183 to 190 horsepower. Built in Hamura, Japan, by Hino Motors for Toyota, it features a 4WD system and has a gross vehicle weight rating in the range of 5,001 to 6,000 lbs. This model is known for its rugged reliability and off-road capability.

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.

TOYOTA 4-Runner 2002

The 2002 Toyota 4Runner SR5 is a robust SUV equipped with a 3.4L V6 engine (5VZ-FE) producing 183-190 hp. Manufactured in Tahara, Japan, this 4WD vehicle offers a strong performance with a displacement of 3378 CC. Ideal for both on-road and off-road adventures, it falls under the Class 1D weight category (5,001 - 6,000 lb).

Spec:

Engine Brake (hp) From

183

Engine Brake (hp) To

190

Engine Configuration

V-Shaped

Engine Manufacturer

Toyota

Engine Model

5VZ-FE

Engine Number of Cylinders

Problems:

Oil sludge buildup

The 5VZ-FE engine is known to suffer from oil sludge buildup, which can lead to decreased engine performance and potential engine damage if not addressed.

Head gasket failure

This engine has been reported to have issues with head gasket failure, leading to coolant leaks and potential overheating.

Timing belt wear

The 5VZ-FE engine uses a timing belt that needs regular replacement. If neglected, it can break and cause significant engine damage.

Valve cover gasket leaks

Oil leaks from the valve cover gaskets are common in this engine, leading to oil loss and potential engine compartment contamination.

Crankshaft pulley wear

The crankshaft pulley can wear out over time, causing a misalignment in the serpentine belt and leading to accessory drive issues.

Fuel injector problems

Fuel injectors can become clogged or fail, leading to rough idle, poor fuel economy, and decreased engine performance.