Question about 1994 Geo Metro
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
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
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
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Posted on Jan 02, 2017
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