A number of Ford cars have had their coil springs fracture. The end of the spring would then pierce the tire resulting in a blowout. See the post at the Ford Taurus club below
Ed
Replaced both rear springs on my '99 Escort recently (60K) to the tune of almost $300...bottom loop was broken on both of them (and they were both slowly shifting out of the bottom retainer on the strut assembly)
Click on link below for pictures of the coil springs-
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