Question about 1992 Chevrolet Lumina APV

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Failed e test twice high NO ppm reading almost double

My 2001 hyundai accent recently failed emission test twice, as the NO ppm limit is almost double. I took this a s a sign of burning oil, so i replaced the piston rings. It needed it too, since the compression wasn't right and one of the rings ended up being seized to the piston. With a new piston rings I took it to get e tested again and failed again. I just took the catalytic converter off and it looks clean. Is there anything else I'm missing- maybe some other part of the xhaust system clogged. I would appreciate any help in the right direction. thank you

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  • Chevrolet Master
  • 22,095 Answers

Try changing the lambada sensor ,should be only one on this age vehicle but again i could be wrong if its a californian spec vehicle

Posted on Jun 05, 2010

  • mustang_28_3 Jun 05, 2010

    there are 2 sensors actually, but the HC ppm reading and CO reading are fine. If the oxygen sensor would be bad would it not affect these two reading also? I just took the catalytic converter out and with the naked eye it looks clean. could the cat not be working properly even if it looks clean?

  • Colin Stickland
    Colin Stickland Jun 06, 2010

    particle problem?? sorry misunderstood your problem ,if its this then either the fuel if wrong like diesel in the petrol or the engine is still burning oil from somewhere like the valve guides or the piston rings are worn in the grooves in the piston allowing them to move up and down in the groove will pump oil into the combustion chambers.worn in grooves means sideways movement in the ring in relation to the piston ,also piston ring gap should be 4th per inch diameter of the bore (water cooled ) so a piston of 3inch diameter will have a ring gap of 12th ,also check the piston in the bore without the rings ,not sure what the tollerance allowed here is because this can vary with the material used like some pistons have a metal insert .

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It is always a good idea to see if you can get any readings from the check engine light if present or much better by an OBD reader to be as certain as possible.

Another component that could cause failing emissions tests is the catalytic converter, giving a similar range of symptoms. To determine if this is the cause is not so easy on older cars with only one O2 sensor, it requires diagnostic skills and equipment. On newer cars with OBDII-systems it will give a recognizable fault code for the cat converter.

Then there are also the issues of the actual cause of malfunction in either or both of these components, is it due to old age and normal wear and tear or is it due to contamination from burning oil (blue tail pipe smoke) or anti-freeze (white smoke), misfiring, etc? Then the cause must be treated as well for a successful repair.

Normally these components have a very long life span and should not have to be replaced more than once or maybe twice for the sensors during the car's lifetime in an otherwise health engine.

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