Skip the auto shop - Our mechanics make house calls

Q: Humming/vacuum sound from engine

asked by on

Didn't hear it on the way to work got in car after work and even in park there is a humming/vacuum noise when idling in park and when accelerating and decelerating I think front right to center of engine... tends to quiet down once car is warmed up but still makes the sound... any ideas?

My car has 85000 miles.
My car has an automatic transmission.

Based on your description, it sounds like you might have a vacuum leak. I would recommend looking around under your hood to see if any hoses are flat, torn, or have holes in them. This will create a vacuum leak if any of these exist. If you can not tell if any vacuum leaks exist visually, I would recommend having a qualified professional run a vacuum test on your vehicle and compare the readings to the manufacturer’s specifications. Most vehicles should have around 20 inches of mercury for the vacuum reading. If your vehicle has below 20 in Hg, it is very likely that you have a vacuum leak. If you still cannot find the leak at this point, I would recommend having a smoke test performed. This will introduce smoke into the engine while it is not running and the smoke will escape wherever the vacuum leak is located.

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
  1. Home
  2. Questions
  3. Humming/vacuum sound from engine

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: How much does it cost to replace the lug nut stud on a 2006 Honda Pilot EXL

The cost depends on whether it is in the rear or the front and also on whether there is space behind the wheel hub to push out the stud and draw in a new one. If the wheel hub does...


Hello. A common reason for code p0191 and p069e is a dirty fuel filter. The fuel filter should be replaced on your vehicle about every 2-3 years. Another reason which is just as prevalent of a cause would be a...

Q: Transmission is making a humming noise. Should we have the transmission checked?

Hi there. If there is a humming noise coming from the transmission, then either a clutch is slipping or a drive shell is broken. First check the fluid to the transmission and make sure that its full and red in...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...