11.   Here is guidance on using a timing light to reset the timing and avoid failing an emissions test.

12.   If the sparks arrive at the plugs too early or too late, engine performance drops and the vehicle is likely to fail an emissions test.

13.   In addition, in most states the emission tests are done by the same neighborhood shops that do the repair.

14.   In Maine, intended to be a kind of pilot project for the emissions tests, the program begun last summer has collapsed.

15.   In Massachusetts, Struhs said he is instructing staff that the tests should be conducted once every two years, rather than the current annual emissions tests.

16.   It has had only one tune-up yet still passes the emissions test with flying colors.

17.   It also would limit a vehicle to only one failure in the every-other-year emissions test.

18.   John Schiereck and Mary Sherman e-mailed questions and comments pertaining to emissions tests.

19.   Last week the authorities said that in June they will drop the program for cars that pass emissions test .

20.   Massachusetts motor vehicles will undergo rigorous new emissions tests starting this October, under a plan to reduce smog, the state announced Friday.