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Old 09-27-2003, 01:20 PM
Duke2.6 Duke2.6 is offline
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Join Date: Mar 2003
Location: Southern California
Posts: 2,011
Late eigthies/early nineties Mercs appear to be very sensitive to cat temperature. You MUST make sure that the car is thoroughly warmed up - say at least ten miles or 20 minutes of urban driving. Do not shut the car off prior to the test. In fact, run the engine at 1500-2000 revs while you wait.

The converters slowly degrade with age/miles, and loose margin. The hotter the converter, the more effective it is, and this becomes critical to passing field emission tests on older cars.

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