my 1992 Honda civic failed an etest ( high nox ) my catalytic converter s new what else could it be ??

Answer 1

Was your engine hot and at working temperature? The catalytic converter won't work at its best until it's up to temperature.

Answer 2

After market cats suck. You really would need to get that cat very hot for it to run efficiently. Also high engine compression could cause your high NOx and vehicle running to lean as well. Maybe your vehicle was overheating. Overadvance ignition timing can do it as well. The list is long so go pay a pro to diagnose and fix and stop being so cheap!

Answer 3

It wouldn't be the cat. The cat removes hydrocarbons. Nox are caused by timing that's too advanced or some other condition causing a "too hot" combustion. Possibly a lean mixture condition.

If you're going to time the ignition right, you'll need a timing light and a book to tell you the correct spec for your car.
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Answer 4

In my estimation it is the O2 sensor, but if you put a new converter on and it is some after-market (not Honda factory) then that could be the problem as those converters are known to never meet the factory exhaust requirements.

Answer 5

honda guy is real in this one, i could additionally prefer to function that lots of the time honda will do a 50/50 chop up with you no remember if that's out of warinty, which potential honda will pay for the section and you pay for the hard paintings, additionally, in case you're taking it to honda and there is no examine engine code for a bad cat (p0420) they at the instant are not going to swap it for merely being unfastened interior the forged iron housing. confident your different mechanic is real yet in honda's eyes, it remains working and does not would desire to get replaced. I additionally study yet somebody else's remark approximately going to a junk backyard... that's unlawful, junk yards at the instant are not alloud to resell emmisions gadgets including catilytic converters e.g.r. valves ect.

Answer 6

Your car does not have an EGR system.High nox readings on civics are usually valves out of adjustment,incorrect ignition timing or incorrect or worn spark plugs.Be sure to use NGK brand spark plugs only

Answer 7

The o2 sensors on this year vehicle should be changed at 60,000 miles as a regular maintenance item, just like spark plugs.

Answer 8

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Answer 9

There could be several things causing this problem. You will need to have a mechanic hook up the car to a computerized diagnostic system. Even then it can be trial and error to find the exact problem.

Sorry it can't be easier!

Answer 10

high nox emission reading are cause by high temperature such as vacuum leak,clogged injectors,wrong thermstat temperature,oxygen sensor respond too slow,too much carbon deposit build-up,incorrect engine timing,and coolant leak into the cylinder