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1999 Cadillac DeVille 4.6L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on
Posted to GM Driveability on 12/15/2008 9 Replies

Any Cadillac guru! I need your help....... 99 Cadillac Deville 4.6 liter. Will not pass emissions due to miss fire.

Vehicle came in with codes up the ying yang. Everything that has been has help but not there yet.

Compression check good. 135 is the compress...

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  Related Documents & Media  1999 Cadillac DeVille

 
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car Vehicle Data

1999 Cadillac DeVille

VIN 1GEEH90YXX
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / multi- port
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Poor Idle Quality, Misfire, MIL Lamp On
OccursAlways, Cold, Hot, Idle

Trouble Codes

P0300Multiple Misfire Detected
Message Closed

car Vehicle Data

1999 Cadillac DeVille

VIN 1GEEH90YXX
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / multi- port
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Poor Idle Quality, Misfire, MIL Lamp On
OccursAlways, Cold, Hot, Idle

Trouble Codes

P0300Multiple Misfire Detected