Have a 1994 Cadillac Sedan Deville recently changed spark plugs. Now service engine soon light is on Why is light on ? Car runs rough?

Asked by Jan 16, 2012 at 05:57 PM about the 1994 Cadillac DeVille Base Sedan

Question type: Maintenance & Repair

Changed front plugs 2 weeks ago and changed back plugs yesterday all but 1 i couldnt get too. did not change any wires. Service Engine Soon Light is now on and car is running rough also having a hard time turning over.

5 Answers

270

Sounds like you 've got the plug wires crossed in the rear, it's easy to do. You can call me me at work, 501-224-2338, Parham West Exxon, I'm Neal. It's alot easier to explain, on the phone. I can't type enough words, to explain it to you.

crossed plug wire,plug you cant get is on back,right,get to it from under the car.google the fireing order for your car it will show you which wire goes to what plug.

2 of 2 people found this helpful.
205

Check your firing order. Your owner's manual should show the firing order for that particular Cadillac. If two wires are out of order it will run bad, and if you get it started it will use a lot of gas, at $3.50 a gallon.

Change that one plug before you do anything and in addition to the answers one and two also insure the plugs are firmly in place. Been there and did NOT do that once or twice.

560

also check make sure ur wires are snapped on the plugs good

Your Answer

DeVille

Looking for a Used DeVille in your area?

CarGurus has 1,685 nationwide DeVille listings starting at $1,988.

ZIP:

Cadillac DeVille Experts

  • #1
    kikero
    Reputation
    2,180
  • #2
    Js08016
    Reputation
    1,930
  • #3
    Cynthiasmith
    Reputation
    1,620
View All

Related Models For Sale

Used Cadillac Eldorado
361 listings starting at $2,300
Used Cadillac Seville
339 listings starting at $2,500
Used Lincoln Town Car
43 Great Deals out of 1,785 listings starting at $1,495
Used Chevrolet Impala
611 Great Deals out of 34,797 listings starting at $1,250
Used Ford Mustang
752 Great Deals out of 42,817 listings starting at $1,300
Used Chevrolet Corvette
248 Great Deals out of 22,275 listings starting at $2,500

Used Cars For Sale

2005 Cadillac DeVille For Sale
245 listings starting at $1,995
2003 Cadillac DeVille For Sale
206 listings starting at $1,988

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.