Why does engine sound louder going faster?

Asked by Jul 02, 2016 at 07:01 PM about the 2006 Subaru Outback 2.5i Limited Wagon

Question type: Maintenance & Repair

Why when you drive the car over 45mph the
engine sounds louder? Is it because it's All
wheel drive?

5 Answers

37,885

The RPM's of the engine are running higher going down the highway than sitting at an idle. Make sure the exhaust system is in good shape also.

14,015

Hmm, are you sure it's just the engine? My question for you is- how did it sound before? 45 mph in high gear, is not that fast for the RPMs to make the engine sound this loud. I agree it might be an exhaust system issue. You should definitely get this checked out. If this is OK, I would look at your differentials. When was the last time you had your car serviced for this?

2,800

Differentials? Not at all. You must be thinking of something else, Mark.... If Tera REALLY means ENGINE, then it's rod knock. But that's unlikely unless there's previous oil starvation. COLD-running noise could be piston slap, that disappears after warmup. DRIVELINE speed-related noise is almost always a worn wheel bearing...in any of the 4 locations. If CHASSIS noise, check window seals and roof rack stuff. Exhaust noise from perforated rear Y-pipe (common in these) tends to be loudest when accelerating from a stop, so I doubt it's exhaust. I'll bet on a wheel bearing, as that's the cheapest of the mechanical sources ($200 each corner).

14,015

Ernie, your right, I think I was thinking of universal joints. Did you consider that as a possibility?

14,015

If not, I agree, wheel bearings, we had them go out on our Toyota Prius and it got noisier as we drove faster. Also, one more thing, we had "cupped tires" on the Toyota and it also made more noise the faster we went. Could be any of these.

Your Answer

Add photo

Related Questions

  • Is it timing belt or rod adjustment or oil pump ? 14 answers

    I've a 2000 Outback 2.5L, just went over 160km. It starts good any weather all year around. But it has developed over last couple of years an annoying clikety clack off timing push-rod kind of ...

    2000 Subaru Outback Base Wagon

    -

    Maintenance & Repair

  • So many problems--is it normal? 28 answers

    My 2000 Outback has 144,000 miles, and I've had to put SO MUCH money into it! Here are a few repairs: Two new front axles (right and left), new CV Boots, new axle boots, catalytic converter, head ga...

    2000 Subaru Outback Limited Wagon

    -

    Maintenance & Repair

  • 2008 outback WAGON 20 answers

    66.700 MILES on it. Told by trusted mechanic that head gasket is going/gone but dealership needs to do repair.Going tomorrow to dealership Also needs axle replacement and might as well get timing be...

    2008 Subaru Outback 2.5 i Limited

    -

    Maintenance & Repair

  • engine light 3 answers

    engine light comes on for no apparent reason, and car looses between 10 & 30% power worse if you use 95octane fuel

    2001 Subaru Outback Base Wagon

    -

    Maintenance & Repair

  • Can you shift faster or more smoothly as an automatic transmission? 20 answers

    Modern automatic transmissions are so sophisticated today that less than 5 percent of new cars sold in the USA have manual-transmissions . And, unlike cars from 40 years ago, a lot of these n...

    2015 Subaru Outback

    -

    General

Outback

Looking for a Used Outback in your area?

CarGurus has 30,505 nationwide Outback listings starting at $2,000.

ZIP:

Search Subaru Outback Questions

Subaru Outback Experts

#1 Markw1952
Markw1952
Reputation 4,640
#2 FordNut
FordNut
Reputation 1,480
#3 TheSubaruGuruBoston
TheSubaruGuruBoston
Reputation 1,340
View All

Related Models For Sale

Used Subaru Forester
359 Great Deals out of 19,907 listings starting at $1,200
Used Subaru Legacy
226 Great Deals out of 17,193 listings starting at $1,200
Used Subaru Impreza
195 Great Deals out of 6,826 listings starting at $1,200
Used Honda CR-V
1,308 Great Deals out of 75,454 listings starting at $1,995
Used Toyota RAV4
1,101 Great Deals out of 53,310 listings starting at $1,588
Used Toyota 4Runner
381 Great Deals out of 19,766 listings starting at $1,987
Used Toyota Highlander
634 Great Deals out of 27,846 listings starting at $2,988
Used Toyota Tacoma
740 Great Deals out of 32,548 listings starting at $1,900
Used Jeep Grand Cherokee
1,089 Great Deals out of 69,713 listings starting at $495
Used Honda Accord
1,206 Great Deals out of 77,326 listings starting at $700
Used Subaru Impreza WRX
47 Great Deals out of 1,242 listings starting at $1,999
Used Toyota Camry
1,434 Great Deals out of 99,709 listings starting at $700
Used Honda Pilot
610 Great Deals out of 20,375 listings starting at $1,950

Used Cars For Sale

2017 Subaru Outback For Sale
20,956 listings starting at $23,920
2016 Subaru Outback For Sale
30 Great Deals out of 804 listings starting at $22,461
2015 Subaru Outback For Sale
91 Great Deals out of 1,437 listings starting at $15,995
2014 Subaru Outback For Sale
84 Great Deals out of 1,716 listings starting at $10,495
2013 Subaru Outback For Sale
46 Great Deals out of 1,183 listings starting at $9,753