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Failed smog 1992 honda civic lx changed the catalytic converter spark plugs the engine runs a little hotter than usual it runs rich it was close to passing because the guy had to run the engine cold and changed the timing and it almost passed hope that info helps

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Run fault codes to find the sensor that is out and replace it . Timing is set by the CPU and position sensors and the problem may be in the HO2/S sensors that is requiring more fuel than is necessary.

Posted on Feb 15, 2014


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Posted on Jan 02, 2017

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SOURCE: Failed Smog Test Close to CA-HC Limits

You can try some over the counter solutions per say. Some of the mechanics in a bottle. They sell some products This will probably be the cheapest router. If this doesn't work then you need repairs.

Pass your emissions test.

Posted on Jan 05, 2009

  • 496 Answers

SOURCE: 1991 Camry running rich

check for vacuum leaks especially around the intake manifold gasket. Although the engine appears to be running rich, it could also be misfiring due to being too lean in one cylinder. When the cylinder doesn't fire the charge, it goes into the exhaust completely unburned and looks like a rich running condition due to the unburned fuel. If it is a vacuum leak causing the problem, the engine will run fine at road speeds but misfire at idle and not pass smog.

Posted on Feb 07, 2009

  • 4669 Answers

SOURCE: car wont pass smog.

Is it running rough? Is the check engine light on?

Posted on May 27, 2009

  • 12 Answers

SOURCE: 1987 honda accord lx failed smog 2nd time. even

true the EGR can really make a change and it should have been the first thing too look at because its the cheapest and easy to install

Posted on Feb 19, 2010

  • 6982 Answers

SOURCE: didnt pass smog i replaced catalytic converter,02 ...

Have a code test done (most larger parts stores do that free) In some cases you may need a shop to put a scanner on it to find specific out of range sensors that may not yet be bad enough to set a code.
I'd also check all vacuum lines and line connections as a small leak can alter the system readings. All the sensors on your car work together and the computer reacts to all the information it receives... Bad info in, bad info out...Only good testing will find the problem.
Primary sensors to pay attention to are the coolant temp sender, MAP sensor, throttle position sensor, manifold air temp sender, mass air flow sensor (if you have one) and the egr valve.and pcv valve (if you have them)
Good testing involves using a digital multi-meter and using instructions for that in chilton or haynes manuals. Replacing parts without testing can get really expensive. (but you have already found that out)
Good luck!

Posted on May 24, 2010

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Honda civic running rich.. Catalatic converter?

The running rich problem can cause the catalytic converter to fail. Not the other way around.
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Honda civic 1998 EX check engine light on codes p300 p0301 p302 p303 p304

I don't think it is your catalytic converter because your light usually flashes and a bad cat I never heard of them causing a misfire. I ran your other code it is for a faulty EGR system. Exhaust gas recirculation excessive. You are getting too much exhaust gas back in the system. This will cause your misfire. Go-to a trusted mechanic and have them check out your EGR system.

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Failed smog, running very rich. changed plugs, cap rotor, wires, tps sensor, map sensor, egr valve cleaned, Has problem keeping stable ide. all over the place. Any ideas

I've seen two cases recently where it was bad distributors causing rough idle. An honorable muffler shop (not a big chain) will test your catalytic converter for free. Is a '91 throttle body? Do Fords have cold start valve or injector? This can cause rich reading if malfunctioning. Anything controlling fuel delivery into engine can malfunction sending extra fuel. When you find problem; do you know clean oil will help pass smog test?

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Check engine light is on on my 2004 civic lx obd 2 scanner gives code 302 changed plugs but that did not fix the problem

A P0302 code means that the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #2.

A code P0302 may mean that one or more of the following has happened:

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1 Answer

Honda civic 1997

yes. it allows ambient air to enter the exhaust stream, which throws off your oxygen sensor reading, typically causing the the car to run excessively rich. it will be harder on fuel, foul spark plugs, and loose power. i definitely recommend replacing it. however, on this model, the catalytic converter is built into the manifold making it a rather expensive unit. beware cheap after market ones, the cats fail prematurely. if you are going to get an aftermarket one, i recommend using one made by Dorman Products. have installed probably close to 50 of them and had very few problems.

Nov 29, 2009 | 1997 Honda Civic

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Bright red catalytic converter . I am having problems running the car when it idles it wants to kill. Tonight I noticed the catalytic converter was bright red when I returned.

The converter is clogged replace it.You probabley are getting less fuel mileage then usual and your car is probabley running hotter.

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Failed Smog Test Close to CA-HC Limits

You can try some over the counter solutions per say. Some of the mechanics in a bottle. They sell some products This will probably be the cheapest router. If this doesn't work then you need repairs.

Pass your emissions test.

Jan 03, 2009 | 1992 Honda Accord

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