I had trouble passing in Ontario Canada last year. Hydrocarbons were high 170 against a 103 pass (wish I lived where you do). They made some lambda adjustments, replaced the plugs and then did a motorvac. I passed at 102 against a 103 limit. I really really hate emissions testing. As far as I am concerned my car hasn't run as well since they made those changes. Fortunately my car will be 20 years old in 4 short years and will be exempt from emissions testing here. From now on I only buy 20 year old cars.

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Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired