1994 Cadillac Deville Service Engine Soon Light Indicator

Tiny
BRACKENBEAR
  • MEMBER
  • 1994 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 62,000 MILES
I have a 1994 Cadillac Deville with 62000 miles on it. Today I took the dog to the vet. Local driving, and on the way home, I stopped at the 7-11 for a newspaper. I left the car running with the air conditioner on for the dog. I was in the store about 5 min. When I came out and got in the car, I noticed the Service Engine Soon light was on. This is the first time this has ever happened. It stayed on until I got home, which was only about a mile from the 7-11. I pulled the car in the driveway, turned it off and waited about 10 min. And went back out to start the car which I did, and the light came on and stayed on. I turned off the car. The car ran fine. Is there a way to reset the computer or do I have to take it to a mechanic. I would appreciate any advice you could give me. I take very good care of the car, and don't drive it often.
Wednesday, April 23rd, 2008 AT 6:59 PM

3 Replies

Tiny
BUZZSAW
  • MECHANIC
  • 1,198 POSTS
You need to see why it set a code, push off and warmer at the same time, with the key in the on position, look at the Insterment panels message center for the codes, write them down and post them here!
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Thursday, April 24th, 2008 AT 1:38 AM
Tiny
BRACKENBEAR
  • MEMBER
  • 4 POSTS
I have a 1994 Cadillac Deville with 62000 miles. The Service Engine Soon light came on for the first time yesterday. You told me what to do to get the codes from the information center on the car. Code 1. PO85
Code 2. PCM?
The information center then said No Code for all the rest. Is it something I can possibly fix myself? Is there a way to reset the Service Engine Light? If I must take it to a dealer for service, do you know approximately what something like this would cost? Any information you can give me would be greatly appreciated. Thank you for your help.
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Thursday, April 24th, 2008 AT 10:56 AM
Tiny
BUZZSAW
  • MECHANIC
  • 1,198 POSTS
Yes this is something you can do yourself, PO85 is throttle angle to high, we need to clean it and go from there

remove the intake boot from the throttle assyembly, its the tube that the air filter is in to the engine, go out and buy some carb cleaner in a spray can and a old tooth brush will work
look down the throat of the throttle plates moving the plates by hand and clean it out, spraying the carb cleaner and scrubbing it with the tooth brush

run through diagnostics again and erace the codes in the pcm ( when PCM? Comes up use the three buttons that allow you to see the charging voltage etc.) Erace the codes and try it
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Thursday, April 24th, 2008 AT 5:22 PM

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