What's up with this?

Smogged a '90 VW Golf today. CA ASM test. Passed. All readings perfect. 0 HC, 0 Nox, .01 Co, 14.8 Co2, .01 02 at both 15 and 25mph. Would have run again, but customer was waiting.

This happened before on a Buick and I tested again and ... Login to read more.