Quote:
Originally Posted by CREWZIN
It might not make any difference right away, since we don't know the exact reason they lowered the gap. It might be that the plugs were wearing out and the gap widened enough (too much) that in just 15-20,000 the plugs were causing problems. By lowering the gap, even when they wore out the gap stayed in a range were they were still good. Just a theory
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I just found out some cars had a hesitation and rough idle so they went to .040
some cars have the problem some do not. Maybe the wider gap does not do as good in colder climates.