Skip the auto shop - Our mechanics make house calls

Q: Buzzing noise at 3,000 RPM on a 1991 Nissan Sentra

asked by on

My 1991 Nissan Sentra makes a buzzing-sound noise at about 3,000 RPM. It's been annoying since that's a constant RPM on a highway. I'm suspecting some loosened exhaust or some loose heat shield.

Yes, it easily could be but it makes it only at the highway speed, so it would be really hard. Jack it up, get under there and hit things with a rubber mallet, and if you hear something rattle, tighten it back on. You can watch my video "finding the sources of car noises" for pointers. There’s a cool tool out there and I bought mine used for 50 bucks, that has a receiver and semi units. You just put the units around the car, put on headphones when someone else is driving your car and when you hear the rattle, you switch the receiver to the different broadcast units and figure out where the rattle is coming from. That’s really handy. You could also have a mechanic, such as one from YourMechanic, detect the source of the sound and make the needed repairs to have this issue resolved.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Failed the emission test. I'm suspecting a bad oxygen sensor.

Hi there. Change out the spark plug wires, put sea foam in the vacuum system to clean the internals of the engine and change the oil and filter. Then drive the vehicle around and fuel up with Techron fuel. When...

Q: Air conditioner doesn't blow cold air

Hi. I would first recommend checking the refrigerant levels. Improper refrigerant levels is the number one cause for malfunctioning air conditioners. I suggest having the pressures checked at the high side and low side of the system. Seeing what the...

Q: Car wont start - 2001 Nissan Sentra

Hello there, a variety of faults will cause your 2001 Nissan Sentra to overheat, be low on coolant, and now have starting trouble. The first problem is the vehicle being low on coolant, either there is a leak in the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.