If you mean the screw-on thingies on the top of the plug, yes. They come
with the new plugs. If one is missing, then take it from an old plug. If you
mean the gizmo that goes from the coil to the plug itself, no. There is no
reason to change those unless one crumbles and breaks. If one goes, my guess
is that the others are not far behind. But, in my '94 3 Series cars, these
are not giving me any problems, and I'd not expect yours to be problematic
If the connectors that Jeff is referring to are going bad, one symptom would
be a misfire under hard acceleration.
This is also a symptom of a failing coil or plug too.
Look for whitish streaking on the connectors.
That is a sign that they may be "leaking voltage" under severe conditions.
I buy most of my parts online from a vendor in Portsmouth, New Hampshire,
They sell the standard connectors for $7, Plugs for $17, Coils for $55
(each), and a "High Performance" coil set (of 8 including the connectors)
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