Questions & Answers for: failed emissions hc high

...failed emissions my 1991 chevy s10 failed emissions 4.3 engine has had a new oxygen sensor spark plugs.throttle body sprayed.failed with high co and hc readings both high.any ideas? Have your cat. ...

...failed emissions test with high CO and HC levels. It failed emissions test with hi CO and HC levels. What are the most common emission issues with these vehicles. Not sure, but did you replace the ...

...failed 1 of 4 emissions test(HC 87 chev van 350ci,failed 1 of 4 emissions test (HC 3x to high at Idle speed), passed fine at Cruise speed. I just did a tune up(pugs, wires,Etc.) Hydro Carbons are ...

emissions test and failed due to High Hydrocarbons. but states the Catalytic converter is fine. what eles could cause high HC levels? hi. first thing to do is change the air filter. even if it appears

...emissions mot results co 5.508 % hc,s 250 on idle Replace your oxygen sensors.               murf427 Help please guys Low idle ...

...high hc and nox can be attributed to a faulty EGR system nox is produced when the combustion chamber temperature gets too high so a small amount of exhaust is cycled back into the air stream to help ...

...failed emissions idle speed hc if >220ppm fail mine 576ppm high speed hc if >220ppm fail mine770ppm sound like you have stuck open egr valve.that will cause HC emission higher than normal. ...

failed the emissions test. HC (PPM) CO % Low High Low High Reading 245 443 3.27 10.02 Limit 220 220 1.20 1.20 Was told to get it tuned up. What would cause these problems? And can it be fixed/tuned up

...failed emissions. I figured it was because the car and motor had been sitting awhile. my first test High speed HC 333 CO 3.75 Low speed HC 406 CO 0.07. I ran about 5-6 tanks of gas through it using ...

failed hc ppm Use Google & study Vehicle Exhaust Emission You'll be there for weeks,if you even understand it all Could type in: High HC Exhaust Emissions or vehicle hydro carbon problems When a ...