Question about 1997 Toyota RAV4

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High hc 97 rav 4 with 240k on it On the smog test at 15mph 112 HC on the 25 mph 43 HC

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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.

Posted on Oct 15, 2008

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I rebuilt the TBI, Changed every sensor in the truck and replaced the heads. I still cannot pass the CA smog test


Check everything that is connected to a vacuum line, check the CAT and the injectors and last run a compression test.

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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.

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1989 cheverolet s 10 pick up 4.3 litre v-6, failed smog hc too high


About the only thing you can do is take it to a qualified DEQ specialist and have them take a look at it. It might be something as simple as a hose, or not.

Nov 28, 2013 | Chevrolet S 10 Cars & Trucks

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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

HC were high on smog on 1998 deville


Replace the exhaust converter if it is 15 years old

New Spark Plugs

New Air Filter

New Clean Engine Oil --Full Synthetic 5W-30

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Feb 08, 2013 | 1998 Cadillac DeVille

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

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HC 112, NO 805


I don't know what the standard is for your state,but that doesn't
sound bad at all, for a 1994 spec vehicle.

How would they know timing was an issue?

I suggest your exhaust converter is worn out
May need a clean air filter
New O2 Sensor

Assume spark plugs aren't too old &
no ignition misfires?

Egr Valve ?

May 23, 2012 | 1994 Toyota Corolla

1 Answer

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

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

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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