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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / March 2005HELP! failed emission inspection with high HC ppm
Hi everyone, I am living in ontario and need to do emission testing every 2 years.My car is 1994 Hyundai Elentra 1.8L, and it is running fine except emission testing Until now I have already failed two times, both of them are one reason, that is high HC ppm first time I got report as 40 km/h CURB IDLE limit reading limit reading HC ppm 68 78 150 14 RPM 2080 valid the rest of data are all fine my mechanic suspect there is problem with RPM, so he changed the spark advanced(forgive me my spelling) and decrease the RPM The second report got even worse as 40 km/h CURB IDLE limit reading limit reading HC ppm 68 90 150 16 RPM 1845 valid i suspect there is small problem regarding it, but i dont have any idea same as my mechanic guy. He told me he is just thinking about why we changed parts but got even worse result. Anybody have same problem before, and how you deal with it please give me a hands because i really need this car to go to work Thank, Robert well I used to have a california smog license. You don't have a problem with CO (carbon monoxide) or Nox (nitrogen oxide), right? If you don't then you have to see what a high HC reading is. HC is raw gasoline. If you have a misfire at high rpm then perhaps wires and plug change could help. Do you notice the engine shaking or running rougher at higher rpm, then it could be a bad plug or wire or coil. Since your HC reading is acceptable at idle I don't think you have an air leak into your manifold. Check your charcoal canister to make sure it is not saturated with gas. Also check vacuum lines which are activated off idle for cracks or leaks or BBs in them (some one may have plugged them. Lastly it could be a bad catalytic converter, but that is expensive.Also have someone with an oscilloscope check your oxygen sensor. Also make sure vacuum lines are routed correctly. You say car runs fine so we are ruling out jumped timing belt or something like that. Alot of earlier excels had that big cat in exhaust manifold that would plug, but I haven't worked on later Hyundais. >Hi everyone, > [quoted text clipped - 27 lines] >Thank, >Robert IMHO, I would just go through the normal tune up proceedure. To stop sending hc to the cat. Then I would find out why the cat is letting hc's out. hth, tom @ www.ChopURL.com It could be caused by one of several things, but improper timing and RPM would not be on the list. I'm concerned because your mechanic seems to be blindly changing settings and swapping parts rather than analyzing the problem. I would take the car to a dealer, or somemone who can hook the car up to the computer, read any fault codes and then follow the steps necessary to narrow down the cause of the high HC reading. I agree with the real tom's post above. Had the exact same problem (high hydrocarbons) with my 90 Lumina. Changed the cat converter and it has passed two emmission tests so far with flying colors. Just my 2 cents Dana S. Waterloo, ON > It could be caused by one of several things, but improper timing and > RPM would not be on the list. I'm concerned because your mechanic [quoted text clipped - 3 lines] > follow the steps necessary to narrow down the cause of the high HC > reading. If taking it to an emission tech isn't an option or desired, using the "shotgun" approach is pretty common. By "shotgun" I mean trying many cheap attempts and taking a chance that it will get you through the AirCare test. I've used synthetic engine lube, fuel additive, superior air filter and these have worked but eventually it will catch-up with issues that need fixing. The last time I had all my bases covered and the gas cap was the culprit. From then I kept the original in the glove box and switched it when I got home. |
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