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?

aspiringsage
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

dandyoun
91,825

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.
Js08016
48,115

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.
aspiringsage
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.
laichena
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.
TopSubaruGarage
15

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

1 out of 1 people think this is helpful.
laichena
10

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

laichena
10

How long can a turbo engine last?

laichena
10

Just been to a mechanic he asked me to do service

spiltpop
0

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.

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