Not really to sure were to start to remove the alternator from my deville. The dummy light on the dash said system not charging. I noticed that my headlights were dimming a few days prior to the message on the dash. After the message was displayed I kept an eye on the voltage and it was reading 14.6v and it then the car would not start after a few hours.
SOURCE: 1994 Cadilliac Sedan DeVille
sounds like a bad mass air flow sensor. this sensor is located on the duct that connects to where the air filter goes, it should have one or two wires coming from it. Unfortunitly they are rather expensive so you will want to have someone with a computer hook up to your car and tell you what the exact problem is before you just go and poke around replacing expensive parts that do not need to be replaced.
SOURCE: The code on my 1993 cadilliac sedan deville comes
E39 means that your overdrive in the transmission is not working which will greatly effect your fuel mileage.
The most common fault is the TORQUE CONVERTER SOLENOID that is faulty.
I hope this helps you
SOURCE: Cadilliac Sedan DeVille 1999 has a leaking head
Give it a shot! I have used "Wonderweld" a Holts product with success and the directions is printed on the bottle of all similar products.
Phllip
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