2006-07-08 18:26:32 · 4 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
if the plugs have aged new ones could improve economy
2006-07-08 18:31:09 · answer #1 · answered by Norman 7 · 0⤊ 0⤋
If your asking if some gimmick plug like those splitfires or the bosch +4 plugs will... then no they will not.
If you have worn plugs and want to replace them with new ones... then yes they will slightly.
2006-07-09 01:37:57 · answer #2 · answered by crazytrain_23_78 4 · 0⤊ 0⤋
it does if the old plugs were worn, cracked or incorrectly set, the new plugs with correct gap settings will give a better ignition source, but only if the ignition timing is correct too. ;) H
2006-07-09 01:31:51 · answer #3 · answered by H 3 · 0⤊ 0⤋
it has very much to do with the preforms of your engine and if u lose power u lose mpg
2006-07-09 01:35:59 · answer #4 · answered by justin o 2 · 0⤊ 0⤋