Question about 1995 Hyundai Scoupe

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We have a Hyundai Scope 95. Today the technical inspector said us, there is a problem with out gases, its co is above 0.3%. what can we do regarding this problem?

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Replace the catalitic converter. Tune up

Posted on Feb 24, 2011


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1989 Toyota 22re fails California Emissions Test. Rebuilt the engine 20K or so miles ago. Has passed most tests with just a little bit of timing adjustments. At 15 MPH, (1670 RPM) HC measures 153...

HC is hydrocarbons or unburnt fuel.(raw fuel ).NO no such gas measurement.did you mean CO this is carbon monoxide or incomplete combustion.(all the fuel is not being burnt).if you mean NOX this is nitrates of oxide and is related to a heat problem.(motor running hot,bad catalytic converter).its probably getting too much fuel and not burning it all,possibly tune-up problem,carburetor(if it has one),bad fuel injection system(dirty injectors),computer(if it has one)may be getting a wrong signal.these are in reference of high HC and CO.for high NOX cooling system not keeping motor cool enough,cooling fan problem(weather clutch fan or electrically controlled cooling fan),poor cooling system circulation,bad catalytic converter.not a running lean problem as the other gases indicate rich problem.the converter may not be able to convert the emission gases to H2O and CO2 out the tailpipe.

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Borrow or change the MAF completely,you have a LEAN combustion condition.The MAF could very well be the problem as it is the most common source lean combustion.
You will need a catalytic converter in good shape.

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Catalytic Converters keep going on on 2002 Hyundai Santa Fe (twice within 15 months) - reason? Dealer said I should have had then do a tune-up (had one done 5 months ago by mechanic) - engine is knocking,...

There are two primary reasons for cat failure; rich running or an ignition miss. Lack of maintenance is usually the cause, you should really be changing your spark plugs about every 40,000 miles even though they're platinum and the dealer recommendation is probably over 100,000. This is one of the worst mistakes manufacturers made in the last ten years, trying to market maintenance free vehicles. Spark plugs degrade and cause more unburnt gases to be released into the cat where it causes damage.
The other big one is the O2 sensor, these also degrade over time and should be replaced if they're signal starts to degrade. Only an experienced tech with a scope can measure this though. It's a good idea just to replace your primary O2's every 100.000 miles. Another cause could be an engine that burns oil, if excessive amounts enter the cat it will degrade rapidly.
Hope this helps.

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