Losing power when going up hills, check engine light comes on and misfire on cylinder 1 & 2, catalytic converter code comes on too, I'm wondering what is causing the loss of power?

40

Asked by Apr 19, 2014 at 02:34 AM about the 1996 Subaru Legacy 4 Dr L Wagon

Question type: Maintenance & Repair

Could a failing catalytic converter cause an engine misfire and losing power, shaking, and stalling going up hill? I am wondering if the air/fuel mix injected into cylinders is off due to failed cat converter, and its causing misfire?

9 Answers

104,215

Stopped up cat will cause lose of power. But if it's the 2.2L or the 2.5L both plugs 1 & 2 come off of the same coil. You could have a bad coil or a fouled spark plug. Sometimes one fouled/bad spark plug will cause both plugs on one coil not to fire. This will also cause a lose of power. I feel that a coil or spark plug issue is more than likely your issue.

1 out of 1 people think this is helpful.
58,915

I agree with dandyoun. Sounds like you're misfiring under load. The most common cause of this is the ignition system breaking down. If you're due for a tune up do that and check the coil(s) as well. If one of the coils is failing the others are soon to follow. Replace them all. HTH. -Jim

2 out of 2 people think this is helpful.
40

Thanks for responding. I have already replaced spark plugs and ignition coil, but that didn't affect it. I've had this error code come up sporadically about the exhaust, code 420, and now the misfiring under load. Am wondering if misfiring and a failing exhaust system are connected? Would a bad cat converter contribute to misfiring, or does a misfiring issue cause a cat converter to fail?

4 out of 4 people think this is helpful.
10

My check engine light has never gone of since I bought my subaru BH5 neither is the power light. .dunno what the problem is. .

1 out of 1 people think this is helpful.
15

@Laichena I plug in the diagnosis and give out the cord, you get

1 out of 1 people think this is helpful.
10

Thank you so much. .will first do the service which I not done for long

10

How long can a turbo engine last?

10

Just been to a mechanic he asked me to do service

My 2004 outback has had the check engine light on for 9 years off and on, dealer did nothing. We've changed all the sparks several times, changed the coil pack, the wires, last changed oxygen sensor. Stalling on hills, flashing check engine. I'd love to get a few more years out of the car, but I can't trust it. I'm not sure I'd ever consider buying another Subaru.

Your Answer

Add photo

Related Questions

  • '98 Legacy L Spitting and sputtering 5 answers

    I own a 98 Legacy L, 2.2L engine. i was driving recently and had the car start to spit and sputter no matter if i backed off the gas or pushed the peddle to the floor. I sucked down a quarter tank of ...

    1998 Subaru Legacy 4 Dr L AWD Wagon

    -

    Maintenance & Repair

  • My girlfriend was driving my car and she was going up a hill when the car lost most of its power and the engin sounds rough. The check engin light came on as well. 10 answers

    The code was a piston sensor position and I have replaced the sensor and it still comes up with the code. It feels as if it is miss fireing and has total lack of power. What could be causing this and ...

    1999 Subaru Legacy 4 Dr Outback AWD Wagon

    -

    Maintenance & Repair

  • Do I need to replace my catalytic converter?? 6 answers

    I have a 2001 Subaru Legacy GT Limited with 160,000 miles on it. Recently, my check engine light came on so I took it to the shop. The mechanic said my catalytic converter need to be replaced, whi...

    2001 Subaru Legacy GT Limited

    -

    Maintenance & Repair

  • 03 subaru legacy engine trouble 2 answers

    2003 subaru legacy l wagon 2.5 Misfiring, backfiring, loss of power, engine vibration, stalling, now wont move. I have po301, 302, 420, and 457 codes. Replaced plugs, wires, fuel filter, upstream o...

    2003 Subaru Legacy 2.5 L

    -

    Maintenance & Repair

  • check engine light with flashing cruise control light 192 answers

    Checked codes at Auto Zone: catalyst efficiency low-bank 1 probably cause: CC failure possibly due to: (1) engine misfire or running condition (2) large vacuum leak (3) engine oil leakage into exhaus...

    2005 Subaru Forester XS

    -

    Maintenance & Repair

Legacy

Looking for a Used Legacy in your area?

CarGurus has 14,935 nationwide Legacy listings starting at $950.

ZIP:

Search Subaru Legacy Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Subaru Legacy Experts

#1 Anthony_60
Anthony_60
Reputation 1,130
#2 Nick Eidemiller
Nick Eidemiller
Reputation 680
#3 dandyoun
dandyoun
Reputation 600
View All

Related Models For Sale

Used Subaru Impreza
153 Great Deals out of 10,702 listings starting at $1,295
Used Honda Accord
994 Great Deals out of 74,838 listings starting at $899
Used Toyota Camry
1,184 Great Deals out of 95,062 listings starting at $1,250
Used Honda Civic
820 Great Deals out of 69,471 listings starting at $1,200
Used BMW 3 Series
1,512 Great Deals out of 38,747 listings starting at $1,495
Used Audi A4
322 Great Deals out of 12,081 listings starting at $950
Used Toyota Corolla
990 Great Deals out of 65,980 listings starting at $1,595

Used Cars For Sale

2017 Subaru Legacy For Sale
9,491 listings starting at $20,824
2016 Subaru Legacy For Sale
33 Great Deals out of 896 listings starting at $18,688
2015 Subaru Legacy For Sale
36 Great Deals out of 706 listings starting at $11,500
2014 Subaru Legacy For Sale
49 Great Deals out of 1,013 listings starting at $9,995
2013 Subaru Legacy For Sale
30 Great Deals out of 649 listings starting at $7,995