Question about 2000 Toyota Tacoma PreRunner

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My 2000 Toyota Tacoma won't pass smog, the HC's are too high. How can I get it to pass?

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6ya6ya
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Posted on Jan 02, 2017

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  • 125 Answers

SOURCE: need 92 toyota paseo to

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.

Posted on Dec 01, 2010

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daves944
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SOURCE: 1986 Toyota new rebuilt motor won't pass smog at

It depends which emission you are failing on but I suspect that it is either CO or NOx. If it is NOx, then it is quite possible that you have a problem with your EGR valve or the ignition timing is incorrect. If you failed CO, you may have a dirty air filter or indeed, a bad carb, but I would need to know the actual gas and readings to be certain.

Posted on Jun 09, 2011

emissionwiz
  • 77169 Answers

SOURCE: My 1991 Toyota previa doesn't pass the smog check

There are many reasons why the engine and the emission systems fails a smog check. If you go to this page it will give you ideas on how to pass the test next time around.

Posted on Feb 13, 2012

SOURCE: 2000 tacoma code 441

PO441--- Evaporative Emission Control System
Incorrect Purge Flow

Posted on Oct 18, 2012

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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

Smog failure High HC's only issue


Hydrocarbons (HCs) are unburned fuel. You may need to replace sparkplugs and wires, if this has been done or doesn't fix the problem you catalytic converter may be worn out.

Apr 17, 2014 | 1997 Toyota Tacoma

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

Not passing smog, no code or engine light


Its going to be tough to find the problem without access to a 4 gas machine. Especially if there are no trouble codes in the computer.
If the fuel mixture is rich it should set a code for one or both O2 sensors. Same thing if the EGR is not working, etc.
One thing that could cause problems is the thermostat not getting the engine up to normal temp.

Jan 29, 2013 | 2000 Toyota Tacoma PreRunner

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

Prerunner wont pass smog due to engine service light


Not positive on this so consider only. The o2 sensor is what actually tells everything else what is going on with emmission and everything else adjusts to what info it relays. The o2 is also subjected to extreme temps and cooling cycles. So, instead of spending money on no answer diagnostism give replacement of o3 sensor so consideratio. If you choose to replace, wd40 and let exhaust cool down. Good Luck.

May 07, 2009 | 2000 Toyota Tacoma PreRunner

1 Answer

My 2000 pontiac grand am 6cy car did not pass smog. It had high hc and no. what could be wrong?


Does it have a check engine light on?
How many miles?
have you replaced the fuel filter, spark plugs, cleaned out the throttle body, etc... yet?

Apr 02, 2009 | 2000 Pontiac Grand Am GT

1 Answer

Didn't pass smog


did it fail high hc? you could change 4and 6 coils around and see if you get a p0306 that means the coil pack is bad. common on this type.

Oct 01, 2008 | 2000 Chevrolet 2500

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