Q: Squealing when decelerating

asked by on

My car has a mileage of about 160,000 miles. When I'm driving and decreasing the speed, I can hear an annoying squealing noise. It seems to be coming from the front of the engine. I had the serpentine belt replaced very recently, at 155,000 miles. It is a metal-like sound that occurs when I drive the car for about 20 miles upon speed decrease. The squealing disappears when I give it gas or rev the engine. I had check the following parts: pulleys, water pump, belt and idler. There are no leaks. What could be making this noise?

Hello. Thanks for writing in about your 2000 Porsche Boxster. Most of the time this is caused by the pilot bearing in the rear of the crankshaft. When it fails it will make this noise at these times. I usually pull the engine drive belt off and start of the vehicle to see if the noise goes away. If it remains, then this is the problem. If you want to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the squealing noise and let you know what repairs are needed.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Squealing when decelerating

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Whisting noise when increasing or decreasing speed

There is a tensioner pulley that keeps the correct amount of tension on your serpentine belt. When these bearings wear out, they can cause this type of a whistling sound that you describe. This is a quick fix and should...

Q: I installed new thermostats in my 2007 Nissan Altima 2.5l shortly after the car started to overheat so I put back the old t-stats

The best thing to do first is put the new thermostats back in the engine. Old thermostats are damaged when they come in contact with the ozone layer outside when they have been running in the engine for a long...

Q: Q: Car lunged backward 10 feet in parking lot

A few different things can cause the transmission to lurch like this. The most common would be something obstructing the gas pedal, a transmission issue, brake fault, or a transmission range switch issue. The vehicle should not be driven until...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...