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Spark plug gap question (archive)
[ Follow Ups ] [ 3-series (E21) Message Board ] [ Msg. Board FAQ ]
Posted by Andy Morang on September 03, 2000 at 22:33:58:

Dear E21 drivers,

I have some questions about spark plug gap. My 1981 320i USA 49-state model uses the Bosch WR9DS plugs. The gap is specified as .024" + .004".

a. Does this mean the optimum gap should be .024" but that I can increase it to .028"?
b. If I can increase the gap to .028", what are the benefits or why should I do it?
c. A reader a few weeks ago suggested increasing the gap even more, to about .032". Why?
d. My plugs foul with oil during stop-and-go driving. I realize that eventually the car needs major repair, but will a wide or narrow gap help reduce the fouling?
Thanks!

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