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Did you change the oil. I recommend changing the oil on all high mileage MB's the Day or THE MORNING before the test. The used oil blows by the rings and elevates the numbers. It worked for me. All my numbers were out of range early one cold morning in Texas. Car was therefore running a little rich. Changed the Oil and went back on a warmer day later in the after noon...brought 'er in HOT!....she passed with flying colors. You should have seen the techs face. He was literally like WTF! He asked what I had done and I told him.
1) 92-93 Octane (Always before the test... and add a can of that liquid Inspection Pass stuff (yeah I know its prolly just some "snake oil"
2) Fresh Oil change night before
3) Bring the car in HOT...Leave it running while you wait
Long as its not missing and you did a tune up in the last coupla years, I would worry too much about the rotors,wires or plugs.
Hope this helps and good luck!
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