my dad who has a 78' beetle, a kombi, a dune buggy, a 2 door brasilia and other slew of old cars not to mention a harabas still running perrrfectly.

recently, my dad had to register his VW beetle and harabas, so an emission test was required.

the 1st tests were downright disappointing since the two failed with "flying colors" literally.

but after a few minor adjustments, voila, it passed and with scores to die for.

What are those adjustments?

Doc Diesel