Question about 2002 Toyota Sienna

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

The test was on the vin of 2gcek19k3m1181504 therpm at 15mph is1451 therpm at 25mph is1479 co2 meas 15.1/15.2 o2 0.2/0.1 hc(ppm)118/98 ave 35/24 meas118/162 co max 0.68/0.87 ave 0.11/0.09 meas 0.22/0.49 no max 999/859 ave 332/274 meas 17/582 pass15mph/fail25mph
2nd test after new plugs,wires,cap,rotor catylaticconv,o2 sensor rpm1435at15mph/1435at25mph co2meas 15.4/15.2 o2 0.0/0.0 hc(PPM) max118/98 ave35/24 meas 118/132 co max0.68/0.87 ave0.11/0.42 meas 0.10/0.42 no(ppm) max 999/859 ave 332/274 meas 14/32 pass15mph/fail25mph any soulution to fix the problem

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  • Toyota Master
  • 2,359 Answers

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

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Do the smog test is a COLD morning?

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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.

Posted on Sep 01, 2009

  • Vincent_G
    Vincent_G Sep 01, 2009

    Do not overlook vacuum leaks on intake manifold and vacuum hose.

    When more air are leak into the system,the computer will dump more fuel to keep the air fuel ratio at at 14.7 to 1.

    Inspect any potential air leak(s) before go for round three of the smog test.





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