Web27 Aug 2005 · High HC + High CO would indicate a rich mixture, high HC w/ normal or low CO would indicate a lean mixture. High 02 would confirm this. You could have a plug that's not quite firing at low RPM, or something to that effect that's causing it to misfire at idle, maybe not enough to detect but enough for it to not pass smog. WebAgain, older cars are allowed more freedom although I find that most any car should be able to run under 400 PPM. My 1923 Haynes runs at 300 to 350 ppm HC and 4.0% CO. High HC readings are a little more challenging to trouble shoot because there are so many possible causes including a mixture or worse, a cylinder balance problem. Carbon Dioxide:
EA81T Failed Smog: High HC - Ultimate Subaru Message Board
WebIn order for your car to pass the smog check, you need to do a drive cycle to get the OBC ready. This process can be either cost consuming or time consuming. You could either drive a whole 200 miles hopefully the OBC is ready or do as BMW dealership had suggested to drive 30 miles, park the car in idle for 30 minutes, and repeat this process for at least 3-4 … WebIn this video I go over how you can diagnose excessive amounts of Hydro Carbons (HC), Carbon Monoxide (CO) and Nitrogen Oxide (Nox) in your exhaust. I go over how a rich or lean condition can... is hdro a buy
Vehicle Failed Emissions, High HC at Idle, so this is how I fixed it ...
WebRunning into high HC in my emissions. Failing at 77 when max is 54. I do usually have a CEL for P0445 which is a Large Evap Leak. I tested once just going in while the car was hot and CEL was off and it failed at a 74, second time (free retest) I used cataclean and octane booster but failed with a HC of 77 (this was recommended by the smog guy). Web13 Apr 2024 · Came back with high HC idle max is 100 meas 139, 2500 rpm max is 130, meas 167. recently put in new plugs, mobil 1 and new filters {air and oil}. The CO idle max. is 1.0 , meas .06. the 2500rpm co max 1.0 meas .29. only fail was HC. Went home and the under chassis {rear cat} did not show significant heat changes {only 20-30 degress or so … http://type2.com/library/exhaust/comix.htm sabah hardware association