Knocking noise

Asked by Mar 07, 2017 at 12:40 PM about the 2007 Subaru Outback

Question type: Maintenance & Repair

When you drive my wife outback when you take
your foot off the gas you hear a knocking noise
from the drivers side of the engine anyone got any
suggestions

3 Answers

74,525

Could be piston slap, a rod knock or a worn wrist pin.

5,320

Cold or hot? If only cold: piston slap; if when hot rod knock. This one's old enough that replacing motor is out of the cards. Just keep coolant and oil up to snuff and don't over rev under load...you could get lucky and drive on this weak plateau for a long time. But if the knock gets progressively worse expect for the motor to crap out while running, at which time chasing a used motor would not be cost-effective given age. Good luck. Note that running synth oil won't help...neither will additives.

5,320

To be clear: piston slap self-corrects as motor warms and the pistons' travel becomes perfectly horizontal, so just don't over rev when cold; but usually it's only audible on acceleration...not decel. So I suspect you've rod knock at temp. You can verify also by warming motor and with quiet ambience just revving motor off idle, listening carefully for the knock.

Your Answer

Outback

Looking for a Used Outback in your area?

CarGurus has 509 nationwide Outback listings starting at $3,000.

Postal Code:

Subaru Outback Experts

  • #1
    Markw1952
    Reputation
    7,720
  • #2
    TheSubaruGuruBoston
    Reputation
    2,470
  • #3
    F_O_R
    Reputation
    2,220
View All

Related Models For Sale

Used Subaru Forester
52 Great Deals out of 958 listings starting at $2,495
Used Subaru Impreza
48 Great Deals out of 879 listings starting at $2,490
Used Subaru Legacy
27 Great Deals out of 443 listings starting at $999
Used Honda CR-V
53 Great Deals out of 2,658 listings starting at $1,495
Used Toyota RAV4
59 Great Deals out of 2,869 listings starting at $2,999
Used Toyota Highlander
18 Great Deals out of 592 listings starting at $3,500
Used Toyota 4Runner
5 Great Deals out of 410 listings starting at $5,995
Used Toyota Tacoma
29 Great Deals out of 791 listings starting at $5,995
Used Jeep Grand Cherokee
95 Great Deals out of 2,701 listings starting at $1,871
Used Honda Accord
68 Great Deals out of 1,098 listings starting at $748
Used Honda Pilot
19 Great Deals out of 837 listings starting at $2,900
Used Toyota Camry
43 Great Deals out of 1,573 listings starting at $2,400
Used Subaru Impreza WRX
8 Great Deals out of 93 listings starting at $6,800

Used Cars For Sale

2018 Subaru Outback For Sale
9 listings starting at $34,915
2017 Subaru Outback For Sale
9 Great Deals out of 146 listings starting at $28,915
2016 Subaru Outback For Sale
20 listings starting at $24,497
2015 Subaru Outback For Sale
11 Great Deals out of 74 listings starting at $19,550
2014 Subaru Outback For Sale
4 Great Deals out of 47 listings starting at $14,995

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.