99 A8 Spark Plug Gap?
#1
99 A8 Spark Plug Gap?
What is the gap supposed to be for the plugs on a 99 A8 4.2? Also, what brands / heatranges are recommended (and not recommended)? I tried to search but didn't find what I was looking for...
Just got it yesterday
Just got it yesterday
#2
Thats a matter of prefference really. Stock is anywhere from .040-.045. Since these engines have a higher compression ratio i would put it between .032-.035, it should run smoother and be a tad bit more powerful. It will make the plugs wear a wee bit faster though.
#6
Those are plugs like the quad spark, with the 4 prong thingys. Electricity only follows the path of least resistance so they tend to fire at one prong on the plug and since they are located in different spots it makes the combustion burn uneven and can cause detonation/poor flame pattern. The bosch plugs you should get for that car are the dual prong, personally i think the NGK plugs are the best possible plugs for that engine and the only ones i would run on that car. Bosch has had problems with the prongs falling off as well, so if you are worried about that go with the NGK's.
Last edited by auditech79; 03-21-2010 at 10:15 PM.
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