Why is my Outback losing power/low idle?

Asked by Sep 15, 2016 at 05:30 PM about the 2000 Subaru Outback Limited

Question type: Maintenance & Repair

Hey there, I have a '97 (I already filled this out before I noticed only 2000
and newer on this forum-sorry, please help anyway!) Subaru Legacy
Outback that is stalling out at stop signs, slow turns, and while idling at
lights. This does not happen at every stop. I throw the car in park, restarts
just fine. Sometimes it tries to lose power while driving, I pump the gas a bit
and it will sputter back into the original speed. Occasionally I hear a
knocking sound in what seems to be under the car when cranking the
wheel or turning sharply, but again, this is not always indicative of the car
losing power.
NO check engine light. Light did come on for a day or 2 a few weeks ago,
ran a P0102 code. I carefully cleaned the MAF sensor with the proper
spray, along with inside the intake valve while car was running. Replaced
fuel filter as well. These things have seemed to get rid of the code, but not
the problem.
Other little repairs I've done in this mystery game have been to replace
battery terminal connectors, and adjusting throttle cables.
I had new spark plugs put in a few years ago, as well as a new O2 if I'm not
mistaken.

I'm nickle and diming it at this point and my mechanic wants me to drive the
hell out of it until I get a code, but it's a very unsafe and frustrating game I'd
rather not be playing!

Thanks in advance for any help.


2 Answers

Also! Before I owned the car, a very badly wired keyless entry and Anti-theft device was installed, and removed before I purchased. The wiring gave me a bit of trouble starting the car a few years ago but never persisted. Around same time O2 was replaced. I'm now realizing this may be a big part of what's going on here.... How do I troubleshoot the wiring harness?

5,940

Doubt it's wiring related. More likely a gummed up throttle body or bad IACV (idle-air control valve). Start by thoroughly spray-cleaning the TB butterfly valve area; check plugs and wires to be thorough. Chase crap in fuel by filling once with premium and a bottle of fuel injection cleaner. Twenty years is a LONG time for these chariots....

Your Answer

Subaru Outback Experts

  • #1
    Markw1952
    Reputation
    8,520
  • #2
    TheSubaruGuruBoston
    Reputation
    2,820
  • #3
    F_O_R
    Reputation
    2,760
View All

Related Models For Sale

Used Subaru Forester
416 Great Deals out of 42,837 listings starting at $998
Used Subaru Impreza
228 Great Deals out of 23,643 listings starting at $995
Used Subaru Legacy
223 Great Deals out of 16,541 listings starting at $1,995
Used Honda CR-V
807 Great Deals out of 66,828 listings starting at $999
Used Toyota RAV4
827 Great Deals out of 56,068 listings starting at $1,600
Used Toyota 4Runner
365 Great Deals out of 27,346 listings starting at $1,750
Used Toyota Highlander
567 Great Deals out of 37,544 listings starting at $2,450
Used Toyota Tacoma
737 Great Deals out of 50,708 listings starting at $1
Used Honda Accord
1,197 Great Deals out of 74,837 listings starting at $561
Used Jeep Grand Cherokee
1,058 Great Deals out of 84,353 listings starting at $1,200
Used Toyota Camry
995 Great Deals out of 101,230 listings starting at $300

Used Cars For Sale

2018 Subaru Outback For Sale
25,049 listings starting at $23,310
2017 Subaru Outback For Sale
51 Great Deals out of 4,119 listings starting at $20,995
2016 Subaru Outback For Sale
77 Great Deals out of 1,477 listings starting at $14,963
2015 Subaru Outback For Sale
106 Great Deals out of 2,100 listings starting at $9,483
2014 Subaru Outback For Sale
45 Great Deals out of 1,239 listings starting at $7,451

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.