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2001 Toyota Tundra Failed For High NO

I was wondering if a car's license plate (both front and back) got stolen but if you still have the DMV renewal paper showing the vin+license, how would you enter the info into the smog machine when it asks for license plate? 2001 Toyota Tundra Pickup Nox seems a bit high. Has a distributorless system. 139k miles. Both rear tires were worn. At 15mph: Max 501 Meas 312 What is wrong with these 2 cars? Could it be the tires and how much does it affect it and how? Can you also please tell me why the emissions are a little high at 15mph but very low at 25? Thanks.

Answer:

As far as the stolen license plate matter, the smog technician will enter this information into the smog machine off of your vehicle registration notice. Your 2001 Toyota Tundra's NO problem may be due to a few different things. You want to first make sure your Toyota Tundra is not running lean (CO is within average limits). Low Co may indicate a lean fuel mixture. A lean fuel mixture will cause your Tundra's engine to run hot. The heat will cause high NOx. NO is created when engine internal temperatures reach above 2500f. So look into thinks which would cause lean fuel conditions; first the oxygen sensors, the mass air flow sensor, vacuum leaks (brittle/broken vacuum lines), sticking closed fuel injectors. If you find that all emissions systems are functioning properly, you can suspect the CAT. Your Toyota Tundra's catalytic converter (after the air/fuel mixture is corrected) takes all the NO reduction load. A defective or worn CAT will not reduce NO enough to pass a smog check. posted by SmogTips Support

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