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1991 Ford Mustang LX 5.0L Poor Idle Quality, Stall
Posted to Ford Driveability on 7/17/2010 9 Replies

Mustang will stall, surge @ idle, "MIL" on with recurring code 66 (MAF ground fault), no diagnostics for this code in Alldata. Tried reman Motorcraft MAF sensor, no change. Someone has previously added a supplemental ground from MAF harness to radiator support...

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  Related Documents & Media  1991 Ford Mustang LX

 
Message Closed w/FIX

car Vehicle Data

1991 Ford Mustang LX

VIN 1FACP44E8M
Engine5.0 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFuel Injection
EmissionsFed
SymptomsPoor Idle Quality, Stall
OccursIntermittently

Trouble Codes

66MAF ground circuit fault
Message Closed w/FIX

car Vehicle Data

1991 Ford Mustang LX

VIN 1FACP44E8M
Engine5.0 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFuel Injection
EmissionsFed
SymptomsPoor Idle Quality, Stall
OccursIntermittently

Trouble Codes

66MAF ground circuit fault