Question about 1996 Saturn SL

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Smog results are hc-343/376.....co-5.33/5.66.....nothing sounds wrong with car drives great but is not passing smog

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You need to take those numbers to a Technician that can read gas analyzst since the computor componsates for any missfires that occurs; however, there can be bad valve guides or rings if it is using oil. If it isn't using oil, it can be a lazy O2 sensor that can be letting the vehicle run rich at times. If any of this is going on, it will eventually kill your catalytic convertor which will cause you additional problems.

Posted on Jul 08, 2010

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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.

Jan 11, 2016 | 1995 Jeep Grand Cherokee

1 Answer

93 toyota tercel failed smog due to high hc. Passed all other co and no ppm. PLease help


Toyota had a drivability kit which replaced carb and vaccume
lines,but I would put a weber carb on it they have a great kit
32/36 dgv progressive two barrel carb runs much better
oringinal carb had problems from start.

Jun 14, 2015 | 1993 Toyota Tercel

1 Answer

1983 Ford Ecoline 150 /6cyl. Failed smog/ Egr numbers were too high How can i fix this to pass smog


Other than testing the EGR valve, not many options. You really need a 4 gas analyzer to know what is coming out of the tailpipe. Otherwise you won't know if repairs have helped the problem.
When you say EGR numbers I'm not sure what you mean. Most of the time the test is for CO and HC gases, along with oxygen and Nox also in some areas. The EGR valve allows some exhaust gas to be recycled thru the engine and reburned. CO or HC could be high if the EGR system is not working.

Feb 06, 2015 | Ford Cars & Trucks

1 Answer

Car does not pass the emissions check.


you should not have to worry about it with the age of your car. nothing is wrong take it somewhere else to be tested

Apr 18, 2013 | 1994 Mercury Cougar

1 Answer

I'm barely failing smog due to high hydrocarbons.


Hi Larry, I your position I believe I would take the vehicle for a diagnostic scan and then check the read outs. There could be a problem with any one of a number of sensors but I believe you'll end up with all odds pointing at the cat. Regards John

Aug 25, 2012 | Cars & Trucks

1 Answer

I HAVE A 99 ALERO OLDS.4CYL.& IT WON'T PASS SMOG


IF DECELERATION FUEL REDUCTION SYSTEM IS NOT OPERATING, FUEL ECONOMY WILL BE REDUCED WHILE HC AND CO EMISSIONS ARE INCREASD.SEE ON MANY ENGINES WITH DECELERATION FUEL REDUCTION SYSTEMS THE PCM STOPS GROUNDING THE INJECTORS IN A SPECIFIC RPM, DURING DECELERATION.

Jun 23, 2011 | 1999 Oldsmobile Alero

2 Answers

Need 92 toyota paseo to pass CA smog test ! What causes too high HC in smog test????


High HC means moisture in the system. Try driving it longer then take it to the smog shop. Otherwise it could be hard like a head gasket or easy such as a PCV not functioning. Any ways you should always drive it about 20 miles before smog check, longer when the weather is cold.

Nov 30, 2010 | Toyota Paseo Cars & Trucks

1 Answer

1991 Honda Accord LX failed emission test on smog test. High CO and HC on 25mph


not enough info. Typically, CO and HC together can be the result of poor fuel control or misfire, or worn components such as O2 sensor or catalytic converter, but without more data, repair recommendations are likely to waste money and not achieve success.

Mar 07, 2009 | 1991 Honda Accord

1 Answer

Failed Smog Test Close to CA-HC Limits


You can try some over the counter solutions per say. Some of the mechanics in a bottle. They sell some products This will probably be the cheapest router. If this doesn't work then you need repairs.

Pass your emissions test.

Jan 03, 2009 | 1992 Honda Accord

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