The short answer- Poor 'staking' by the factory to hold the plug in place.
The longer, more complicated answer is that the plug is made of steel
and the EGR valve body is made of aluminum. Since the valve body is
exposed to a constant stream of hot exhaust gases, it tends to expand more
than the steel plug, allowing the plug to move under high exhaust gas pressures
and eventually work it's way out of the valve body.
If your Sidekick has high mileage (+100k miles) there's also a chance of a partially
blocked catalytic converter, which would raise exhaust pressures @ the egr port
even higher, resulting in the plug being blown out.
I've had it happen twice on my 96 Sidekick (1.6 L engine), and I'm ready to replace
it again. You'll find that an American nickle fits in the place where the plug blew
out and use a metalized epoxy to glue the nickle in place. This fix lasts about 2 years,
Hope this helps!
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