2002 Honda Accord 4 cyl Front Wheel Drive Automatic 172000 miles
My car is failing smog because it's running lean. Well maintained changed ozygen sensor, new spark plugs and wires, changed oil. Car runs smooth with no problems, no codes on computer showing. Dealer claims compression problems need valve job, smog techician said compression is good. Here are the numbers: CO2 15MPH 56 25MPH 14.1 25MPH 14.1/HC 15MPH 89 25MPH 87/CO 15MPH 1.39 25MPH 1.32/NO 15MPH 20 25MPH 25/Please advise.
As a smog tech, the numbers for the carbon dioxide seem to be incorrect, could you please restate them and the limits too. You seem to believe the condition is due to a lean mixture, please tell me your thoughts here.
October, 22, 2010 AT 10:57 AM
CO2 15MPH 14.1 25MPH 14.1 I'm not seeing any limit numbers. Please see attachment
October, 22, 2010 AT 12:09 PM
The mixture is actually too rich. Lambda is.9591. I would start with checking for an intake restriction and possibly a fuel pressure issue or perhaps an air mass sensor issue. There is a calculator available online for finding the lambda calculation at Smogsite. Com, I use it to determine what the mixture is and for determining if the engine is in fuel control, yours is not. Mixture too rich is from fuel pressure too high, injection pulsewidth too long, intake restriction, Oxygen sensor sending incorrect information, engine coolant temp sender sending wrong input or it might be going into default because of ECT being ignored or disconnected (check wiring) Operation outside of proper fuel control can damage the cat after prolonged periods, let me know how you fare with this issue. Ã
October, 22, 2010 AT 12:15 PM
I see you are in the 619 area code, so am I.
October, 22, 2010 AT 1:34 PM
Thank you for your analysis. Any advice on where I can take my car without being taken?
October, 23, 2010 AT 2:02 AM
I will check my sources and let you know straightaway.