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Here are five common signs that indicate idler pulley issues:
Engine noise due to idler pulleys can be attributed to three possible situations:
In other words, the noise from a failing idler pulley will increase as the damage increases. So, it’s best to have the part checked while the pulley noise is light.
Generally, an illuminated check engine light won’t turn on to indicate a failing idler pulley. However, it may turn on due to the effects of a busted idler pulley.
What triggers the check engine light?
A broken idler tensioner pulley can cause a displaced drive belt, leading to a series of other issues, including alternator failure. The check engine light would be triggered as soon as the drive belt slips off.
So, the check engine light could be a symptom of a damaged idler tensioner pulley.
The idler pulley is a component of the serpentine belt system that drives important elements like the alternator, power steering (via the power steering pump), and water pump.
That’s why a bad pulley will hamper a vehicle’s performance and needs immediate servicing.
Note: Some older vehicles have a separate fan belt and alternator belt rather than a single serpentine belt connected to all the engine accessories.
A visual inspection of the engine belt, especially if you hear a chirping engine noise, can help you determine if you need an idler pulley replacement.
Look out for abrasions and scoring marks on the pulley or damaged pulley bearings. This wear and tear could eventually lead to pulley seizing or a pulley breakdown.
Alternatively, you could have a mechanic take a look at your engine bay if you suspect pulley damage.
A failed idler pulley can affect the rotation of the accessory belt and may even cause the belt to slip off and stop working.
So how do you know when you have a faulty drive belt?
Most probably, the check engine light will be illuminated, and you’ll need to inspect the engine. Your car may have a stalled engine with an undone or broken drive belt. But even if the engine can run without the belt, it’ll overheat as the water pump will stop functioning.
A failing idler pulley may affect your car’s performance and your ability to drive it. It can wear down the drive belt or let it slip out of place, creating a host of other engine and electric component problems.
So, it’s best to replace a failing idler pulley at the earliest, as prolonging the issue will only increase the costs and repair parts needed.
Tip: It can be beneficial to have the tensioner pulley, belt tension, and timing belt checked when getting an idler pulley replacement.
The total price to replace an idler pulley can range between $80 and $200. This range includes the cost of the new part as well as the cost of labor.
Typically, the auto parts cost ranges from $40 to $90, and the labor costs about $40 to $110. Moreover, the cost also depends on the vehicle model and parts needed.
Here are a few examples:
Tip: If the idler pulley is covered under warranty, you could save costs on the replacement.
Here are answers to some common queries about idler pulleys:
An idler pulley is a component of a vehicle’s drive belt system that helps the belt function properly. It works with the tensioner, helping guide the serpentine belt as it rotates at high speed.
It helps maintain enough tension to ensure that the belt runs smoothly and doesn’t come in contact with other parts of the engine.
In doing so, the pulley helps power some important engine accessories — including the alternator, AC compressor, and power steering system.
However, it can wear out and eventually need replacement because it’s in constant contact with a fast-moving belt.
You may need to replace the idler after the car has crossed 100,000 miles. But it can wear down faster depending on one’s driving style and operating conditions.
Also, watch out for odd noises from the engine bay or other pulley and belt tensioner failure symptoms to know when it’s time to replace the part.
You can drive your vehicle with a bad pulley, but not for long. Depending on the pulley’s condition, the car may run for months or could break down in a few days.
However, driving with a bad idler pulley isn’t worth the risk.
If the pulley and the serpentine belt system are damaged, the belt could break or fall out of place.
This could cause:
So, it isn’t safe to drive a car with a faulty pulley. Calling an automotive mechanic immediately could help you save money on potentially more repairs.
Here are the DIY steps to replace an idler pulley:
Note: Your vehicle may have different bolts around the drive belt or a different mechanism to release the tension on the drive belt. Moreover, idler pulleys are involved in many crucial functions of a vehicle. So, it’s best to leave its replacement to a professional mechanic.
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