Originally Posted by IGoFast1589
Backfires come from a rich mixture, Dackel...
That is a myth - I believe.
I have had some tuning experience with SW tuning (on Volkswagens and Porsche's)many years back, in the early 1990's. Most of the time a popping back fire is from running too lean a fuel mixture. I know common sense says its must be too rich of a mixture... but it is more common for it to be from a lean mixture.