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1991 Mercury Grand Marquis LS 5.0L Erratic performance
Posted to Ford Driveability on 7/16/2002 5 Replies

91 Mercury Grand Marquis [...][...] 5.0 L SEFI Mileage 90995.8

Good Morning Technicians

We have one here that we thought would be easy. We have two KOEO hard [...] are codes 23 TPS and code 34 EVP. We followed the Ford diagnostic flow charts as listed in All...

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Message Closed w/Summary

car Vehicle Data

1991 Mercury Grand Marquis LS

VIN 2MECM75F3M
Engine5.0 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI / SEFI
EmissionsOBDI
SymptomsErratic Performance
OccursAlways

Trouble Codes

23tps
34evp
Message Closed w/Summary

car Vehicle Data

1991 Mercury Grand Marquis LS

VIN 2MECM75F3M
Engine5.0 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI / SEFI
EmissionsOBDI
SymptomsErratic Performance
OccursAlways

Trouble Codes

23tps
34evp