Not passing emissions. Replaced o2 sensor,exhaust system, air filter, cap, rotor, wires and spark plugs. Car has under 100,000 miles, does not smoke and has a little black residue on the exhaust tips.
Carbon shows it runs rich but a tune up should help but why did it fail their are hundreds of reasons and solutions
Could be a number of things like air leak on the intake , cat in the exhaust , exhaust blowing or not sealed properly , map sensor ( if it has not got one ) then maf sensor , coolant temp sensor . Have had it plugged in to diagnostics ? There may be fault codes to give u indications of problem
Check o2 sensor wiring down back of eng and also for broken wires there can lean out w/hex t handle at fuel distributor ontop of air box
If you facing a little black smoke along with it your engine is running a little rich. Black smoke indicates unburned fuel and this could cause a black stain and leading to test failure
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what do I have to do to lean the fuel system out. The car runs great but I just need it to pass. Any input will help thank you!
All of the emissions readings are high, Co, NOx, and HHC.
Hi there
I changed the turbo in my VW Jetta 2007. Diesel. Automatic 1.9. I thought that will clear the black, grey and white smoke, and losing power. But it didnt, and i was very embarrassed to drive it, i hated my life
So the mechanic disconnected the anti shutter valve, it became brand new, never lost power even for a twinkle of an eye. Its giving service light, but thats no prob. U will love ur car. Wish u all the best
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