Question about 1994 Mercedes-Benz C-Class

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The co2 was at 14.6 for both the hc was at 48 at 15 and 70 at 25

The co was at .12 at 15 and .05 at 25,the no was at 285 at 15 mph and 15 at 25 mph

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  • Dave  C
    Dave C May 11, 2010

    How many miles on the car?

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Being that the co dropped and hc rose at 25 mph, it looks like things are getting leaner, the first thing i would start looking for would be unmetered
air, such as an intake leak between the airflow meter and throttle body ,or dirty airflow meter.
t
he next thing i would look at is spark advance.
the c02 looks pretty good to be a cat. but might be a possibility.
top end cleaner may be a shot in the dark.

Posted on May 20, 2009

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Posted on Jan 02, 2017

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What causes co & hc readings to high


HC is raw or un burnt fuel. CO is incomplete combustion meaning the air fuel is burnt but not burnt completely. check O2 sensors for operation, fuel pressure, gas in oil or how long has it been since an oil change. check engine timing, dirty injectors. when was the last time a tune-up was done plug/wire condition is the air filter clean. just some things to check

Sep 05, 2014 | Volvo S40 Cars & Trucks

1 Answer

Failed MEAS


wow, no context but i can read your mind?
ok SMOG failed. right?
what speed, there are 2 in uSA, 15 and 25.mph.
so there are 3 tests, which one. all are PPM in usa.
parts per million.
but is that HC , CO, or NOX? or ?

based on your numbers is HC
hydrocarbons or in barstool, its raw gasoline leaving rear of car.
unburned fuel..

572 ppm is way too high 12-19 is normal
id say the CAT is bad.
but can be , engine is bad, and burned out the cat.
that is why all savvy mechanics, check the that the engines
holds closed loop status, (EFI closed loop) at the speed yours failed.
if not in closed loop the cat will burn up (rich)
that is first.
Once that is cured. you check HC again. if out of spec
you did burn up the can , new cat time.

that is the correct way.

Feb 19, 2014 | 1998 Toyota Tacoma

1 Answer

Virginia emissions test failed - 15 MPH HC and CO; 25 MPH HC


get your injectors cleaned. change the air filter .change your plugs. put a fuel cleaner in your fuel tank.

Dec 01, 2013 | 1998 Volvo S70

1 Answer

I failed Emissions Test: 15mph: HC - (max 66) 150


go to autozone and have them look and the check engine light and that will help you figure it out. they should also give you a piece of paper that will tell you what is wrong take that to an auto mechanic and ask his opinion

Oct 28, 2013 | 1997 Honda Civic

1 Answer

My 1993 honda civic lx failed smog check the HC and CO were hig HC=MAX was 79 and MEAS 98 and 25 mph MAX was 44 it meas 65 and lastly the CO MAx was 0.41 and MEAS 0.51


Its running rich and the most likely cause is the lamba sensors ,check them out with a multimeter to check the heater circuits are functioning and the reading coming out is correct

Mar 04, 2013 | Cars & Trucks

2 Answers

Golf 1.4 2003 very high emissions


Replace your oxygen sensors.
murf427

Aug 29, 2012 | 2003 Volkswagen Golf

1 Answer

1985 Plymouth Voyager 2.6 L failed NOX emission test


1) please RUN the scanner and computer test from any repair shop you must get the exactly faulty in your emission system
2) However you can go to the www.automecanico.com+ www.autoelectronico.com this sites is in spanish, but you can translate with your web browser and I Higly recomend because has Powerful information update for any cars models, Try it and fix it.
God bless you

Jul 09, 2012 | 1985 Plymouth Voyager

1 Answer

I have a 93' Ford Taurus that failed emissions


run the fault codes to find the faulty sensor
sensors that control the exhaust emissions are the HO2S ( heated oxygen sensors in the exhaust manifold/s
the O2 sensor ( oxygen sensors after the cat converters ) and the EGR unit that recycles exhaust gas back through the engine to re-burn the gasses

Oct 17, 2017 | 1993 Ford Taurus

1 Answer

1989 Toyota 22re fails California Emissions Test. Rebuilt the engine 20K or so miles ago. Has passed most tests with just a little bit of timing adjustments. At 15 MPH, (1670 RPM) HC measures 153...


HC is hydrocarbons or unburnt fuel.(raw fuel ).NO no such gas measurement.did you mean CO this is carbon monoxide or incomplete combustion.(all the fuel is not being burnt).if you mean NOX this is nitrates of oxide and is related to a heat problem.(motor running hot,bad catalytic converter).its probably getting too much fuel and not burning it all,possibly tune-up problem,carburetor(if it has one),bad fuel injection system(dirty injectors),computer(if it has one)may be getting a wrong signal.these are in reference of high HC and CO.for high NOX cooling system not keeping motor cool enough,cooling fan problem(weather clutch fan or electrically controlled cooling fan),poor cooling system circulation,bad catalytic converter.not a running lean problem as the other gases indicate rich problem.the converter may not be able to convert the emission gases to H2O and CO2 out the tailpipe.

Apr 24, 2011 | 1989 Toyota Pickup SR5

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