Why does my car keep knocking and pinging after I turn the ignition off?

Asked by Sep 23, 2016 at 04:20 PM about the 2012 Subaru Legacy 3.6R

Question type: Maintenance & Repair

3 Answers

27,145

It's called dieseling, https://en.wikipedia.org/wiki/Dieseling - try cleaning spark plug of carbon deposits or a good fuel injector cleaner, and check for trouble codes, esp. too rich conditions. You shouldn't need to switch to higher octane fuels as a solution, if car is clean and maintained it should run on regular unleaded just fine.

25

check your oil and the level of it, sometimes its the oil that could cause the noise amongst other things but that is where i would start. good luck ty

5,710

Can't imagine you don't have a CEL accompanying this nonsense. Likewise, Subie went to iridium plugs by now, so they should NOT be fouling. Nonetheless, ensure that the proper heat range plugs are in there and follow any CEL trail. Maybe there's a vacuum leak causing enrichment, especially at idle speed? So use your ears too!

Your Answer

Legacy

Looking for a Used Legacy in your area?

CarGurus has 15,725 nationwide Legacy listings starting at $1,700.

ZIP:

Subaru Legacy Experts

  • #1
    Anthony_60
    Reputation
    1,270
  • #2
    Nick Eidemiller
    Reputation
    740
  • #3
    dandyoun
    Reputation
    720
View All

Related Models For Sale

Used Subaru Impreza
198 Great Deals out of 20,835 listings starting at $1,995
Used Subaru Outback
414 Great Deals out of 35,578 listings starting at $199
Used Subaru Forester
386 Great Deals out of 36,003 listings starting at $750
Used Honda Accord
1,043 Great Deals out of 58,767 listings starting at $1,099
Used Subaru Impreza WRX
42 Great Deals out of 1,306 listings starting at $3,999
Used Toyota Camry
931 Great Deals out of 81,453 listings starting at $1,395
Used Honda Civic
766 Great Deals out of 69,789 listings starting at $1,499
Used Subaru Impreza WRX STI
32 Great Deals out of 705 listings starting at $8,995
Used Ford Fusion
968 Great Deals out of 67,990 listings starting at $1,900
Used BMW 3 Series
1,090 Great Deals out of 33,464 listings starting at $1,000
Used Audi A4
283 Great Deals out of 11,973 listings starting at $199
Used Nissan Altima
1,001 Great Deals out of 78,292 listings starting at $1,000
Used Toyota RAV4
724 Great Deals out of 46,294 listings starting at $1,195

Used Cars For Sale

2018 Subaru Legacy For Sale
8,321 listings starting at $19,405
2017 Subaru Legacy For Sale
34 Great Deals out of 1,979 listings starting at $17,876
2016 Subaru Legacy For Sale
27 Great Deals out of 674 listings starting at $12,888
2015 Subaru Legacy For Sale
70 Great Deals out of 1,513 listings starting at $10,977
2014 Subaru Legacy For Sale
28 Great Deals out of 666 listings starting at $7,999

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.