Ron_H

Thanks for the advice. I have absolutely no trouble passing smog in California. We need to test every two years, and the last time the tech said it was one of the cleanest cars he had seen (and it had at least 180,000 miles on it). I presume that is evidence of a good CO value? I'm due for smog test again this year and it will be revealing if the same shop finds similar results.

John Speake

I assume your car has cats ? Then a good figure is to be expected, but a better than average figure might suggest the mixture is weak before the cats.

See if the shop will carry out the idle mixture/speed procedure described in Vol 1 A of the WS manual pages 24-203 - 207 . Failure to get up to 1% before the cats means the MAF should be replaced for optimum running.

If the MAf is the original 180k unit, then it is certainly due for replacement !

Ron_H

Thanks John. I'll have it checked out. It can't hurt to check it again.