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My 1989 chey g20 van wont pass smog they said my hc [ppm] 115 over 95 max and my meas is 182 and my no ppm is 149 over 101 what could that mean and they said my fuel evap test fail

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6ya6ya
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Posted on Jan 02, 2017

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  • 834 Answers

SOURCE: failed smog check

How well does the vehicle run?

Assuming that the engine did pass the EGR function test on the emission test results, and the MIL (Malfunction Indicator Light) or check engine light is not on when the engine is running, and if you are not sure when the last time it was that the engine had a complete tune-up, with distributor cap, ignition rotor, spark plugs, spark plug wires, air and fuel filters, then a complete tune-up would certainly help, and if the engine oil and oil filter have not been changed in a while, then they should also be changed before an emission test because long used engine oil traps carbon and it will show up as higher CO on the emission test because the emission analyzer will be able detect the higher CO from the engine oil through the PCV valve.

However, it would seem from those HC readings that there is a vacuum leak, and carefully inspect all of the vacuum lines for any cracks or damage, (especially the vacuum line to the fuel pressure regulator) because cracks in the vacuum lines seem to like to hide underneath the lines.

The emission label under the hood should have the vacuum line routing diagram printed on it, and the vacuum lines should all be checked to be certain that they are all connected correctly.

Here is the firing order diagram for that vehicle to help assist you tune-up the vehicle.


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Posted on Jul 10, 2010

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toneman2121
  • 775 Answers

SOURCE: MY CADILLAC DEVILLE 1997 DONT PASS SMOG IT FAILED

i'd start with a complete tune up. plugs, wires, pcv valve, gas and air filter. what engine code are you getting? normally vehicles 1996 and newer get a obd (computer) emissions test not an asm (tail pipe) test. and perhaps a new catylitic converter and oxygen sensors

Posted on Apr 17, 2010

YellowNo5
  • 268 Answers

SOURCE: 1991 Honda Accord LX failed EVAP test. The ASM

Things to consider or replace...

If you are getting a Check engine Light let me know, it will make things easier to diagnose.

Catalytic Converter
Oxygen Sensor
EGR Valve

Posted on May 17, 2010

  • 27 Answers

SOURCE: I purchased 1990 nissan sentra it will not pass

most likely its the O,2 sensor

Posted on Jul 23, 2010

dmsr63
  • 2050 Answers

SOURCE: My HC (PPM) WAS HIGH

An old worn out engine will have high emmisions due to burning oil. Also, with age, a catalitic converter won't burn up any fuel vapors causing high emmisions.

Posted on Sep 11, 2010

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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

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

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My 1990 chevy astro van didn't pass smog. Paperwork says it failed the following; Ignition timing: 99 ATDC. Also, ASM Emission Test Results; 15mph HC (PPM) max is 122 measured 127, 25mph max is 102...


the smog test looks like the engine is miss firing, that could cause the timing to be out of whack also, try a old fashioned tune up, new spark plugs, wires, and filters also replace the PCV valve. any time you see the NO that high suspect a miss fire.

Feb 24, 2011 | Chevrolet Astro Cars & Trucks

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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 EVAP test. The ASM Emission Test Results showed Test 25mph RPM 1933, %C02 MEAS 14.60, %02 MEAS 0.22, HC (PPM) MAX 61, GP 236, MEAS 19, CO (%) MAX 0.60, GP 2.10, MEAS 0.02, NO...


Things to consider or replace...

If you are getting a Check engine Light let me know, it will make things easier to diagnose.

Catalytic Converter
Oxygen Sensor
EGR Valve

May 17, 2010 | 1991 Honda Accord

1 Answer

MY CADILLAC DEVILLE 1997 DONT PASS SMOG IT FAILED THE HC (PPM) THE MAX WAS 47 THE AVE WAS 9 ND THE MEAS WAS 140 AT 15MPH AND AT 25MPH THE MAX WAS 31 AND THE AVE WAS 7 AND THE MEAS WAS 127.. CAN YOU TELL ME...


i'd start with a complete tune up. plugs, wires, pcv valve, gas and air filter. what engine code are you getting? normally vehicles 1996 and newer get a obd (computer) emissions test not an asm (tail pipe) test. and perhaps a new catylitic converter and oxygen sensors

Apr 17, 2010 | 1997 Cadillac DeVille

1 Answer

Failed Emission Test with high NO(PPM)


Sort out the fuel/air mix and check for oil burning or replace the van.

Sep 17, 2017 | 2000 Saturn Ls 4dr Sedan

1 Answer

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.

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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.

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

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

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Make sure the tires are at 32 psi

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Do the smog test is a COLD morning?

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REMOVE excess cargo off the van.

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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

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