Question about 1991 Toyota Camry

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Car wont pass smog.

Replaced spark plugs, plug wires, oil change. checked battery along w/ alternator. O2 sensor, and a new catalyc converter. still wont pass smog. what is the problem...

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  • its420_us May 11, 2010

    Is your check engine light on?

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  • Master
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Is it running rough? Is the check engine light on?

Posted on May 27, 2009

  • Lori Reynolds
    Lori Reynolds Aug 07, 2014

    No has not come on for some time now P1074 and one P1074 pending other smog parts replaced though now higher emissions now gross pollute? my private mechanic thought my car wou,ld pass came up more rich

  • Lori Reynolds
    Lori Reynolds Aug 07, 2014

    FPS, fuel filterm uypstream o2 we are going to replaced downstream O2 form CAT Cat has not been tested

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My 88 buick limited wont pass smog hc is 169 at low idle changed map sensor and oil still wont pass but car runs fine.


Are you burning oil? Does this car still have a catalytic converter? Have you changed spark plugs or air filter recently. There are many causes for a high hydrocarbon reading: burning oil due to rings or valve stem seals; catalytic converter malfunctioning or missing; vehicle in need of a tuneup or air filter replacement. Poor combustion results in high hydrocarbon levels. Good luck with it.

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I have a 1991 Cadillac Deville with a V8. It won't pass smog. Has high co. I replaced the egr valve, charcoal canister, spark plugs, spark plug wires, cap and rotor, catalytic converter, oxygen sen


Hello! when you say you checked the MAP sensor what do you mean? Did you take voltage readings at idle ? A vacuum leak is the likely culprit, especially to the MAP...The minor shake at idle being the major clue...Send a comment...guru..saailer

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We had to have the calatic converter replaced. We did this after doing an oil change, air filter change, and new spark plugs and still hadn't passed smog. After changing the calatic converter it passed smog with scores of 25.

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1991 Camry running rich


check for vacuum leaks especially around the intake manifold gasket. Although the engine appears to be running rich, it could also be misfiring due to being too lean in one cylinder. When the cylinder doesn't fire the charge, it goes into the exhaust completely unburned and looks like a rich running condition due to the unburned fuel. If it is a vacuum leak causing the problem, the engine will run fine at road speeds but misfire at idle and not pass smog.

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