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1991 Cadillac DeVille 4.9L Poor Idle Quality, MIL Lamp on, no communication
Posted to GM Driveability on 6/7/2011 6 Replies

Vehicle idles rough/misfires, service engine soon and service vehicle soon lights are on, fuel mileage data inop, and speedometer inop. These things all happen at the same time and it is intermittent. Usually happens at start-up, sometimes only lasts a minute ...

6 Replies Received (View Replies)

  Related Documents & Media  1991 Cadillac DeVille

 
Message Closed w/FIX

car Vehicle Data

1991 Cadillac DeVille

VIN 1G6CD53B7M
Engine4.9 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
SymptomsPoor Idle Quality, MIL Lamp on, No Communication
OccursIntermittently

Trouble Codes

52PCM Memory Reset
Message Closed w/FIX

car Vehicle Data

1991 Cadillac DeVille

VIN 1G6CD53B7M
Engine4.9 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
SymptomsPoor Idle Quality, MIL Lamp on, No Communication
OccursIntermittently

Trouble Codes

52PCM Memory Reset