Question about 1992 Oldsmobile Cutlass Supreme

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Cant pass smog failed nox got 2032,allowed 695 95 bmw 318i

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  • celsobatilo5 Jul 02, 2009

    i going to install a new cat nut do you think it will make a dramatic difference

  • yadayada
    yadayada May 11, 2010

    sounds like a worn cat

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Since your car has no EGR valve, you have one of two problems. You either have a bad O2 sensor, making the car run lean, or you need a new Cat. Or, you've had a bad O2 for so long that it ruined your cat, and now you may have to replace them both. Either way, I'd highly recommend having a smog tech take care of this problem for you, since you have no access to a smog machine that will tell you if the repairs you've done have solved your problem.

Posted on Sep 12, 2009

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1 Answer

Does not pass smog at 25mph


IT FAILED AFTER THE CAT TOO?
NO RESPONSE
SO

POST THE FAILED REPORT
THERE IS NO HELPING ANYONE LACKING THAT.
CO =
HC=
NOX=
-----
IF PRESENT
CO2=
O2=

DATA MATTERS. BIG TIME.

WHY GUESS?
WHY GO BROKE DOING ALL THAT.?


The engine is running real bad.
this is a fact.
due failing with new cat.
so....
scan it yet
and print on all sensors readings?

or ask you mechanic to do that, he knows how.

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fist i would like you to post the year make and model of the truck along with the HC ppms and NOX ppm it would be very helpful but high hc and nox can be attributed to a faulty EGR system nox is produced when the combustion chamber temperature gets too high so a small amount of exhaust is cycled back into the air stream to help cool them there are other causes but without looking at the levels its much harder to say

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1 Answer

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NOX is produced when cylinder temperatures exceed 2500 f.
Your vehicle has 2 ways to directly reduce NOX, EGR system, and catalytic converter, and also the cooling system indirectly.
Take a look at the EGR system, vacuum lines, pipes, and make sure the diaphragm moves. Disconnect the vacuum line, then push on the diaphragm and plug the hole (from vacuum line) when you release the diaphragm there should be vacuum. Also you may want to take it out and give the EGR passages and EGR valve a good cleaning, with some type of carbon cleaner like carb cleaner.

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1 Answer

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Check your local parts store for this...it may be a dealer only item though.

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1 Answer

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1 Answer

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1 Answer

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nox is from running lean..... its realy high temps that cause this.......... replace the o2 sensors this should cure that any more help let me know

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1 Answer

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if i were you i would contact cragen and ask them if the car has it and how much the replacement part is

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