Engine Firing Orders: 1990
Mercury Colony Park 5.0 liter V-8 VIN "F" Mercury Cougar/XR7 3.8 liter V-6 VIN "4" Mercury Cougar/XR7 3.8 liter SC V-6 VIN "R" Mercury Grand Marquis 5.0 liter V-8 VIN "F" Mercury Grand Marquis 5.8 liter V-8 VIN "G" Mercury Sable 3.0 liter V-6 VIN "U" Mercury Sable 3.8 liter V-6 VIN "4" Mercury Topaz AWD 2.3 liter L4 HSC VIN "X" Mercury Topaz AWD 2.3 liter L4 HSO VIN "S" Mercury Topaz FWD 2.3 liter L4 HSC VIN "X" Mercury Topaz FWD 2.3 liter L4 HSO VIN "S"
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