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

109,395

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

8,050

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.

8,050

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 987 nationwide Outback listings starting at $3,995.

Postal Code:

Subaru Outback Experts

  • #1
    Markw1952
    Reputation
    10,760
  • #2
    TheSubaruGuruBoston
    Reputation
    3,940
  • #3
    F_O_R
    Reputation
    3,760
View All

Related Models For Sale

Used Subaru Forester
25 Great Deals out of 1,026 listings starting at $2,188
Used Honda CR-V
57 Great Deals out of 4,188 listings starting at $4,495
Used Subaru Impreza
16 Great Deals out of 951 listings starting at $3,985
Used Subaru Legacy
15 Great Deals out of 415 listings starting at $3,995
Used Toyota RAV4
71 Great Deals out of 3,739 listings starting at $4,495
Used Toyota 4Runner
11 Great Deals out of 540 listings starting at $4,995
Used Toyota Highlander
16 Great Deals out of 1,250 listings starting at $2,995
Used Toyota Camry
34 Great Deals out of 2,228 listings starting at $2,445
Used Toyota Tacoma
20 Great Deals out of 1,572 listings starting at $2,140
Used Honda Accord
31 Great Deals out of 1,744 listings starting at $2,800
Used Honda Pilot
9 Great Deals out of 760 listings starting at $6,880
Used Jeep Grand Cherokee
83 Great Deals out of 4,866 listings starting at $2,994
Used Ford Escape
93 Great Deals out of 5,460 listings starting at $2,489

Used Cars For Sale

2018 Subaru Outback For Sale
9 Great Deals out of 424 listings starting at $28,383
2017 Subaru Outback For Sale
59 listings starting at $26,241
2016 Subaru Outback For Sale
69 listings starting at $19,495
2015 Subaru Outback For Sale
6 Great Deals out of 166 listings starting at $16,543
2014 Subaru Outback For Sale
72 listings starting at $11,450

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.