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

74,595

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.

22,275

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?

5,710

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).

22,275

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

22,275

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

Outback

Looking for a Used Outback in your area?

CarGurus has 34,656 nationwide Outback listings starting at $199.

ZIP:

Subaru Outback Experts

  • #1
    Markw1952
    Reputation
    8,220
  • #2
    TheSubaruGuruBoston
    Reputation
    2,690
  • #3
    F_O_R
    Reputation
    2,630
View All

Related Models For Sale

Used Subaru Forester
390 Great Deals out of 34,925 listings starting at $1,695
Used Subaru Impreza
208 Great Deals out of 20,329 listings starting at $1,995
Used Subaru Legacy
235 Great Deals out of 15,507 listings starting at $1,950
Used Honda CR-V
778 Great Deals out of 55,567 listings starting at $1,750
Used Toyota RAV4
722 Great Deals out of 45,051 listings starting at $1,600
Used Toyota 4Runner
270 Great Deals out of 22,419 listings starting at $1,750
Used Toyota Highlander
447 Great Deals out of 29,934 listings starting at $1,900
Used Toyota Tacoma
570 Great Deals out of 43,899 listings starting at $2,500
Used Honda Accord
1,068 Great Deals out of 56,675 listings starting at $899
Used Jeep Grand Cherokee
832 Great Deals out of 70,385 listings starting at $700
Used Toyota Camry
985 Great Deals out of 79,810 listings starting at $1,200
Used Ford Escape
1,013 Great Deals out of 93,122 listings starting at $1,200
Used Honda Pilot
497 Great Deals out of 34,626 listings starting at $1,333

Used Cars For Sale

2018 Subaru Outback For Sale
19,649 listings starting at $23,310
2017 Subaru Outback For Sale
33 Great Deals out of 5,420 listings starting at $20,198
2016 Subaru Outback For Sale
65 Great Deals out of 1,365 listings starting at $16,569
2015 Subaru Outback For Sale
75 Great Deals out of 1,938 listings starting at $9,900
2014 Subaru Outback For Sale
59 Great Deals out of 1,352 listings starting at $7,395

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.