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1991 Cadillac DeVille 4.9L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy
Posted to GM Driveability on 1/9/2010 12 Replies

The OEM Cat was broken core-Replaced with Magnaflow. Customer came back after DIY tune up. after retrieve code 52, captured running data.

Tested EGR manually and with alternate vacuum supply and it functions, but the load is 99% with ignition off, KOEO, KOER...

12 Replies Received (View Replies)

  Related Documents & Media  1991 Cadillac DeVille

 
Message Closed w/Summary

car Vehicle Data

1991 Cadillac DeVille

VIN 1G6CD53B1M
Engine4.9 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / sfi
EmissionsFEDERAL
SymptomsExcessive Emissions, Poor Idle Quality, Poor Fuel Economy
OccursAlways, Idle

Trouble Codes

52ECM Long-Term Memory Has Been Reset
Message Closed w/Summary

car Vehicle Data

1991 Cadillac DeVille

VIN 1G6CD53B1M
Engine4.9 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / sfi
EmissionsFEDERAL
SymptomsExcessive Emissions, Poor Idle Quality, Poor Fuel Economy
OccursAlways, Idle

Trouble Codes

52ECM Long-Term Memory Has Been Reset