Question about 1994 Geo Metro

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HC fails higher and higher with everything i fix

My 94 geo metro 1L is failing majorly for HC's. initially failed for only 60ppm over- so i put on a new muffler- than failed again for over 600ppm so i replaced the bad pcv valve and cleaned/worked over my egr valve. idle's great now but failed again for over 800ppm over. limits is 200 in WA

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  • a_man_00 May 26, 2009

    ya i go to the same place, possible the probe's are fluctuating, they seem to have a problem and have one of there guys hold the probe in there a certain way to test it. cars running cool- no overheating problems at all.
    Cat converter bad- thats what i was thinking

  • a_man_00 May 26, 2009

    thanks for that but its not there gear-

  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    is your car running cool... or do you have a temp light only..... I had this happen one time. The engine was not getting hot enough. the thermostat was wide open. also the catalitic converter may have a problem. by the way are you taking it to the same place. The probe they are using maybe flucuating



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Many things can cause high emissions. Excessive HC means that too much unburned gas is getting through the engine and into the exhaust (gas is the hydrocarbon). The chief culprits for HCs are a bad catalytic converter, bad injector, excessive fuel pressure (usually caused by a plugged fuel pressure regulator), or bad sensors (especially temperature sensor). A catalytic converter will usually only make 100-200 ppm difference in HC emissions so it's not likely that it could cause your numbers by itself. Metros have an O-ring seal around the injector in the throttle body. Sometimes that goes bad which lets gas leak into the intake.

A good first step would be to check if there are any trouble codes stored in the computer. The EGR system lowers Nitrous Oxide (N2O) emissions so it's not your trouble.

Posted on Jul 14, 2009

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Try another location. and if so go get your money back and inform them of the issue. I know this is not your problem but they need to be acountable for there faulty equipment. They are making money on that device and that device is faulty... only if you can prove it to them

good luck.. If this helped you please rank

Posted on May 26, 2009

  • Raymond Ramirez
    Raymond Ramirez May 26, 2009

    If the thermostat is wide open the car can not heat up properly. This will cause improper vaprization of the fuel as it goes into the cylinder then cause improper detonation. far fetched but I have seen it.



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