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Re: 1991 V.W. jetta 2.0 16v
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
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Usually changing the spark plugs, air filter and an oil change will fix your problems. If your oil is old, you can get the high carbon. I don't usually change the spark plug wires and I just take the distributor cap off and clean the contacts.
you need to do a major tuneup !!!!!!! replace air & fuel filters, spark plugs & plug wires, distributor cap & rotor, replace OXYGEN SENSOR, change oil & filter, hopefully your catalitic converter is ok, if not , it should be replaced !!!!!!!!!!! together w/tuneup would be the best way to assure passing emissions !!!!!!!!
I would replace CATalitic converter, this car is old, plus a tuneup is 100% necessary , spark plugs wires, ditributor cap & rotor, plus both the air & fuel filters need replaced. change oil & filter. then you will pass emissions test. and your car will run like its suppose too. if you don't do all this , then buy a new car !
Hello! when you say you checked the MAP sensor what do you mean? Did you take voltage readings at idle ? A vacuum leak is the likely culprit, especially to the MAP...The minor shake at idle being the major clue...Send a comment...guru..saailer
This almost always if different depending on the shop you take you car to. The best way is to look in your owners manual, pick your diving conditions, normal or extended use, and see what Mistubishi recommends. Should be at least, oil change,rotate,brake inspection, air filter, spark plugs, plug wire set, timing belt. On a Mits with over 100k miles I always recommended Distbutor cap and rotor, Transmission flush(for auto), Induction flush.
O2 sensor helped me but not enough to pass. Loosen your distributor bolts, one on each side, turn your distributor counter clock wise about 1/4 inch and tighten bolts. This will raise your CO but should reduce the NOX. When the vehicle is passed, undo the changes.