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1998 Ford Mustang GT 4.6L Poor Idle Quality
Posted to Ford Driveability on 8/24/2010 13 Replies

Long term fuel trims are running -25 on both sides of the engine(codes 172 and 175). Spark plugs have a white cast on all side wires. Customer just bought the car and had us install a reman engine. He thinks that the previous owner "tuned" the computer with an...

13 Replies Received (View Replies)

  Related Documents & Media  1998 Ford Mustang GT

 
Message Closed w/Summary

car Vehicle Data

1998 Ford Mustang GT

VIN 1FAFP42X4W
Engine4.6 L / 8 cyl / GAS
Trans5-speed Standard
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality
OccursAlways

Trouble Codes

172175 -
175
Message Closed w/Summary

car Vehicle Data

1998 Ford Mustang GT

VIN 1FAFP42X4W
Engine4.6 L / 8 cyl / GAS
Trans5-speed Standard
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality
OccursAlways

Trouble Codes

172175 -
175