Question about 1991 Volkswagen Jetta

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1991 V.W. jetta 2.0 16v

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.

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  • james noris Jul 06, 2008

    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!

  • james noris Jul 07, 2008

    All of the emissions readings are high, Co, NOx, and HHC.

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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

Posted on Jan 11, 2013

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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

Posted on Jan 26, 2010

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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

Posted on Jul 06, 2008

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Failed Exhaust Converter


Should have gone at least 12 to 14 years


I suspect the car wasn't having a happy life for
many years


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Has anyone tried adjusting the fuel air mixture?

Based on what I am reading this is a gas engine and I am also assuming it is fuel injected. (Or does it have throttle body fuel injection?)

I suspect a case of dirty fuel injectors at the moment. They will need to be removed and cleaned.

If you have throttle body fuel injection then you will need the fuel air mixture adjusted.

If you respond can you let us know the "engine size" that is installed please. It would help us to help you in troubleshooting.

Thanks for using Fixya. Kelly.

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