1999 Subaru Legacy -- all of a sudden, engine malfunctioning....

15

Asked by Dec 27, 2011 at 11:56 AM about the 1999 Subaru Legacy 4 Dr Outback Limited 30th Anniversary AWD Wagon

Question type: Maintenance & Repair

Legacy outback (ltd) engine sounded perfectly fine for months

took on the highway, up to 70 -75 mph, hadn't gone that fast yet
worked fine all the rest of that night

sat in driveway -- in cold weather (20F) that rose to 40 and back to freezing -- for a couple days

after couple days, it starts fine, but after driving 10 minutes, I notice a barely perceptibly stuttering sound with the engine that started to shake the car

got worse as time went on, lower RPMS made it shake much more, higher rpms seemed smoother.

i stopped to check it out, idling made the car shake really bad, engine made a chugging, puttering sound out of the exhaust.

I put a bottle of dry gas in gas tank, in case water in gas tank
I checked oil next day, was low but had some

started car today, cold morning, and car really chugged and shutoff, gave it extra gas and higher RPMS ran smoother, took foot off gas, low RPM idle made engine cut out.

engine has new spark plugs and wires, but this issue seems reminiscent of the spark plug problems I used to have


any advice would be MUCH appreciated! thank you!

4 Answers

335

Sounds like a bad air flow meter (mass airflow sensor) or clogged cat convertor. Is the service engine light on? I need to know miles. Is it overheating? does it smell like rotten eggs? Email me subject 99 legacy @ 96sidekick@gmail.com

2 of 2 people found this helpful.
15

Thanks for your response, Mike. I took it to the mechanic yesterday, he ran a system diagnostic computer that read cylinders 1 and 3 missfiring, and the knock sensor was reporting something. They said they would want to do a cylinder pressure test to see if the head gasket was bad.... around 120,000 miles headgasket broke and caused overheating, they replaced it with the version that wasn't so faulty as the factory one. they also said it could be the timing belt might have skipped a tooth. car has 237,000 miles, doesn't smell like rotten eggs. thanks!

1 of 1 people found this helpful.
45

Hey Andrew - this sounds similar to a problem I've been having on my '96 for years and years now. In my case, it seems to be related to O2 sensors. I'm a little hazy on the details, it seems like there are multiple sensors on the engine (I have a '96 Legacy Outback ... don't know which engine size). After taking it to a dealer several times and the problem never completely going away, my local guy replaced one (or more?) O2 sensors and the problem went away for a good long while. It's started to rear its head again, though. Someone who knows more than I will confirm or deny that there are multiple sensors. So I don't know how helpful my response is, but Oxygen Sensors might be something to check.

1 of 1 people found this helpful.

Clogged cat

Your Answer

Add photo

Related Questions

Legacy

Looking for a Used Legacy in your area?

CarGurus has 14,433 nationwide Legacy listings starting at $999.

ZIP:

Search Subaru Legacy Questions

Subaru Legacy Experts

#1 Anthony_60
Anthony_60
Reputation 1,250
#2 Nick Eidemiller
Nick Eidemiller
Reputation 700
#3 dandyoun
dandyoun
Reputation 690
View All

Related Models For Sale

Used Subaru Impreza
202 Great Deals out of 19,395 listings starting at $1,995
Used Subaru Outback
361 Great Deals out of 42,351 listings starting at $1,100
Used Subaru Forester
409 Great Deals out of 29,354 listings starting at $995
Used Honda Accord
948 Great Deals out of 77,757 listings starting at $899
Used Toyota Camry
1,100 Great Deals out of 90,760 listings starting at $1,599
Used Honda Civic
809 Great Deals out of 88,112 listings starting at $1,299
Used BMW 3 Series
945 Great Deals out of 30,262 listings starting at $1,000
Used Nissan Altima
1,147 Great Deals out of 79,679 listings starting at $500
Used Audi A4
293 Great Deals out of 10,505 listings starting at $1,200
Used Toyota Corolla
856 Great Deals out of 70,589 listings starting at $1,874

Used Cars For Sale

2017 Subaru Legacy For Sale
11 Great Deals out of 8,644 listings starting at $16,524
2016 Subaru Legacy For Sale
35 Great Deals out of 809 listings starting at $12,500
2015 Subaru Legacy For Sale
37 Great Deals out of 1,118 listings starting at $10,995
2014 Subaru Legacy For Sale
52 Great Deals out of 1,137 listings starting at $9,999

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.