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1993 S10 Chevrolet Blazer DID NOT PASS THE EMISSIONS TEST FAIL HYDROCARBONS, CARBON MONOXIDE passed NO ppm limit 1500 ,reading 0 , failed CO%limit 0.50 reading 0.84, failed HC ppm limit 90, reading 115. I have a new CAT...and O2 sensor, any ideas to help me pass

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  • Chevrolet Master
  • 22,219 Answers

What about the air filter is it clean ,silly question i know but you would be surprissed ,does this vehicle have one O2 sensor or two one after the cat as well or is it too old for two O2 sensors ,i know most europeon market vehicles didnt have cats till 1992 and most didnt have two sensors till around 2000 ,also check the two white or two black wires on sensor for 12v these are the heater feed wires for the sensors

Posted on Jan 03, 2011

  • paul gale Jan 03, 2011

    new k

  • nascar_tony
    nascar_tony Jan 27, 2013

    Mine did the same thing, had a complete tune up, new plugs, new filters, etc. Passed the high emissions, but failed the idle emissions. Actually got worse after the complete tune up. Now what, I'm limited for funds. Any help to pass emissions on the idle would be great!

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Posted on Jan 02, 2017

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Here is some info for you to read, besides me explaining what ppm is, i also gave you some info of how to solve this, Ain't that special LOL. Mike

Overall Result: PASS or FAIL. A vehicle with a properly operating engine and catalytic converter will have very low HC and CO readings. However as a vehicle ages the HC and CO emissions will increase and may become erratic. As a vehicle ages it becomes increasingly important to be sure that the engine and converter are fully warmed up before the test to have the best chance of passing the test.

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CO (%): The percentage of the exhaust that is carbon monoxide (CO).

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RPM: The engine speed in revolutions per minute (RPM) or N/A.

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Cruise Emissions: The emission readings measured at 2500 rpm.

Cruise Result: PASS, FAIL or N/A.

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These are the possible problems:

bad o2 sensor
bad EGR valve
bad cat
bad timing
dirty injectors
bad plugs or wires
the less costly fixes include replacement of the o2 sensor and EGR valve i would not clean the EGR I would buy a new one there are very cheap you can pick these up at any local parts store .
also run some injector cleaner through your car at least a full tank of gas and one bottle of injector cleaner should be ran through.
you can also have your timing checked for a relatively low price.
and when you go into to have the vehicle checked make sure the car is been running because your cat convertor has to be warm in order to preform at it peak so do not do it when the car is cold.
all of the above are pretty reasonable fixes the general rule of thumb when you work on your own vehicle is start with the cheapest fix first then go on to the next.

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1 Answer

1993 S10 Chevrolet Blazer DID NOT PASS THE EMISSIONS TEST FAIL HYDROCARBONS, CARBON MONOXIDE


i woulsd try and change the o2 sensor located Under hood, passenger side, lower engine area, mounted in exhaust manifold ,and you have a catalytic convertor has it ever been changed i had an s-10 that always barely passed inspection even when brand new good luck

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The egr is the only way to lower the no. heet only works with co and hydrocarbons see if the egr tube is full of carbon or the egr system is blocked up with carbon I have owned aerostars for 10 years and have had both the 3.0 and the 4,0 vans and .be thankful you have the 3.0 you would have to take off the upper intake to deal with the egr on the 4.0

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we cure your trouble that caused your engine light to come on and you will pass your test.
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