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Rough running '05 Honda Civic
08-16-2015, 12:52 AM
Post: #1
Rough running '05 Honda Civic
Recently purchased a 2005 Honda Civic Sedan EX 1.7L V-tech, manual, 120,000 miles in the Seattle area. I replaced the timing belt about 2,000 miles ago. When accelerating, the car stumbled momentarily and it threw a P0340 code (Camshaft Position Sensor A Circuit) and a P0420 code (Catalyst System Efficiency Below Threshold Bank 1) and continued to "hiccup" every minute or so as I drove home. I replaced the Camshaft Position Sensor with one from the dealer and cleared the codes. I drove the car again and it continued to stumble and threw another P0420 and P2A00 (Oxygen Sensor Circuit Range/Performance Bank 1 Sensor 1.) I cleared the codes. My wife drove the car (forgot she wasn't supposed to) and she said it started to miss badly and barely made it home. It threw a P0134 (Oxygen sensor Circuit No Activity Detected Bank 1 Senor 1.) I replaced the Bank 1 sensor with a Denso 234-9017 (which I believe to be the stock sensor) purchased from Amazon. I cleared the codes. The car has not thrown another code. The car runs and drives perfectly for about a minute and then the idle starts to surge. After about two minutes, the car misses and backfires so badly off idle that it will barely run. Thanks for any help.
Garth
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08-17-2015, 12:07 AM
Post: #2
RE: Rough running '05 Honda Civic
try disconnecting the cat or the muffler and see how that runs. sounds like one of those 2 items might be partially clogged or fully clogged. I know with a restricted exhaust your car will not run properly.
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08-18-2015, 04:59 AM
Post: #3
RE: Rough running '05 Honda Civic
Thanks Sandman, that sounds reasonable. I will give it a try.
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08-18-2015, 10:39 AM
Post: #4
RE: Rough running '05 Honda Civic
If it ran ok before the timing belt then the first thing I would do is re-trace my work to see if something got disturbed. You just might find a busted vacuum line or a plug wire that is not fully seated. Also, any coolant on old ignition wires might cause an intermittent skip so double check for leaks.
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08-28-2015, 11:39 PM (This post was last modified: 08-28-2015 11:40 PM by Garken.)
Post: #5
RE: Rough running '05 Honda Civic
Thanks for your reply, Rupe. I certainly have considered this. The amount of work required to do this (and the fact that I had it apart twice now) is discouraging me from going to the timing belt again. When I replaced the cam position sensor, I did look over the timing belt quickly and all looked OK but I regret not doing a more thorough inspection at the time. The fact that the car ran perfectly for 2000 miles after the install leads me to believe the problem is else were. I will try the easy route first and if that doesn't work I will have to consider the belt.

I disconnected the exhaust at the exhaust manifold and the car ran 90% better. I then reconnected the exhaust and broke the exhaust behind the catalytic converter hoping to see if the cat or the muffler was clogged. The car ran terrible again. This would lead me to believe the cat is clogged. I'm curious to know if the sensors in the exhaust or the ECM could be problem so I might try isolating the sensors and see if the car runs any better with the cat reconnected. Maybe it ran better when the cat was removed because the sensors were removed from the system and not because the cat was removed.
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08-29-2015, 08:00 AM
Post: #6
RE: Rough running '05 Honda Civic
I would say that the Cat is clogged. The sensors don't really change how the vehicle runs. It's kind of like if the gas gauge says "Empty" but the tank is full. The car doesn't think that it's out of gas, it just keeps running. The Oxygen sensors do a little more than a gas gauge due to the fact that they help the computer decide if the mixture is rich or lean but they shouldn't have any major effect.

Please let us know what you find.

Thanks for using the forum,
Garner

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08-29-2015, 12:09 PM
Post: #7
RE: Rough running '05 Honda Civic
Thanks, I can't work on the car for several weeks but I will order a new cat ASAP.
I'll let you know what happens.
Thanks again.
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09-17-2015, 01:54 AM
Post: #8
RE: Rough running '05 Honda Civic
I replaced the cat and the car is running perfectly. It has more power than ever. I cut the pipe to look at the cat and it is hard to believe the car was able to run at all.
Thanks again,
Garth
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09-17-2015, 09:41 AM
Post: #9
RE: Rough running '05 Honda Civic
Thanks for the follow up with the final resolution. This will allow others reading here to learn something via your experience!
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