Question about 1985 Chevrolet S-10

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Just Smog Checked my 85 Chevy S10 and it failed-the tech said the HC - 139 ,ave 43, 141 CO= 0.96 ave,0.16,0.98 111 32 124 1.22 0.15 1.31 what do these numbers mean and what part is in need of repair

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Need tune up plugs filters throttle body cleaned pcv valve replaced egr cleaned

Posted on Oct 07, 2009

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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.

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2002 Mitsubishi Galant P0300 Intermitent Miss between 2500-3000 rpm


Have you checked fuel pressure? Random misfires (0300) are usually related to fuel, spark, or compression issues-one of those is not right.

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Why does my car **** and hesitate and has failed smog 2X is now a gross polluter ?


Because you failed to have a shop look at the data
& make the required repairs & get caught up on preventative
maintenance BEFORE you went to inspection

If you were in fact at a shop, for any reason,then they have no idea
how to test vehicle

Have you considered the motor is shot & you have leaking valves?

May 20, 2014 | 2000 Toyota ECHO

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Smog test failed nox too high 91 chevy camero v6 170.000mi


If the plug wires are original replace them with a quality set and also do the plugs. If the car still fials you will need to replace the catalyst.

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I have a 1991 chevy pick up with a 5.7l it failed the test 2


You did not post the odometer reading on the van but base on the year it should has over 85,000+ miles on it.

The most likely source of the high Hydrocarbon (HC) is clogged or drippy injectors.

Change the fuel filter if it is over 48K miles.

Ran two or more tanks full of Chevron gas will help clean out the fuel system.

====

The air fuel ratio can be off is the air filter is clogged or the mass air flow sensor give incorrect data to the computer (ECU).

Change the air filter is it over 20,000 miles or you can see sunlight though it.

Use CRC Mass Air Flow cleaner or electronic part clean to gently clean the mass air flow sensor.

==========

Change the oil to 20W50 or one grade higher to prevent blow by.

You current motor oil is soak with HC from blow by.

=======

Make sure the tires are at 32 psi

=======

Do the smog test is a COLD morning?

=======

REMOVE excess cargo off the van.

=======

These are little things that I would do.

If the HC is still high at 25 mph then you will need a professional fuel injector cleaning or replace the injectors.


Please post more data on the third smog test on the comment window.

Mar 12, 2009 | 2002 Toyota Sienna

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

High hc


you may need replace the catalytic converter, but 1st do this, clean the throttle body and idle airbypass valve, change the oil before the retest as well, get it as hot as you can before the test, hold it at a high idle prior to the test, this may squeak you by, as a 20 year smog tech these are the thing I did, if all else fails do the cat conv.

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1 Answer

My chevy s10 failed emissions


Have your cat. converter checked out. I just had one of these for the same reason in my shop today.

Jul 09, 2008 | 1991 Chevrolet S-10

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