Its a mechanical part, they break at some point.
Only way to find out is to tear it down, be nice to see what exactly broke.
90 LX, Previous 4 cyl.
408W In the Works
TW FAC's, Jay Allen cam, Super Victor 2001 V6 5 Speed Daily Driver
Windstar Intake, Dual Exhuast, CAI, Headers
Best ET: [email protected] mph (on 18's)