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1991 Buick Rivera only came with a 3.8L engine known as the 3800
The crank sensor is behind the Harmonic balancer / Crank pully. Special tool required to remove pully without damageing it. once pully is off the crank sensor is held inplace by 2 bolts.
look around under the hood , on the underside of the hood, sometimes the belt routing diagram is on a sticker also check a Chiltons Manual sold at auto pARTS STOReS or on the web
EVAP is for Evaporative emissions control system, so no this is not EGR, that is Exhaust Gas Recirculation system, as far as the P1665 goes it is related to the other trouble code P0440, u will need to replace the EVAP system Purge flow control solenoid. This should correct both problems after u replace the part disconnect the battery for 5 min's to reset system.
Likely, the "overdrive lockup" is malfunctioning. This is internal and requires that trans be removed for service. Have an honest, competent transmission shop evaluate your problem. Transmissions are expensive, so unless the remainder of your vehicle is in really excellent shape, the cost of a rebuild may not be a valid expense (only you know that) consider buying another vehicle. Transmissions are no longer a quick easy backyard repair!
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