Compression Ignition Addict
Join Date: Dec 2007
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I'd think it's the Starter, no matter what the Parts Store says....
Here's what happens, any why "banging" it fixes the problem. You have Two points that can get, physically, stuck in place AND a burnt spot on the commutator will prevent contact and with it. The two points are the Brushes in their holders, and the Bendix (the solenoid on the starter itself that pulls the gear out to the flexplate and makes the contacts to power the starters motor) can bind in a position that its magnetic coil isn't strong enough to pull it out of.
So, a couple of good "Whacks" and the commutator rotates a bit, the brush drops some in the holder, or (the most common) the Bendix arm resets and it starts again!
BUT, you take it in for a Test and none of those problems exist at That Moment, and you're told "It's Fine, we checked it"....