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 Sedan FWD

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

280

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.
215

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.

580

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 1,511 nationwide DeVille listings starting at $1,999.

ZIP:

Cadillac DeVille Experts

  • #1
    kikero
    Reputation
    2,250
  • #2
    Js08016
    Reputation
    1,960
  • #3
    Cynthiasmith
    Reputation
    1,750
View All

Related Models For Sale

Used Lincoln Town Car
33 Great Deals out of 1,734 listings starting at $500
Used Chevrolet Impala
588 Great Deals out of 34,468 listings starting at $900
Used Mercedes-Benz S-Class
162 Great Deals out of 8,130 listings starting at $1,200
Used Lincoln Continental
18 Great Deals out of 3,408 listings starting at $32,794
Used Chevrolet Tahoe
836 Great Deals out of 41,907 listings starting at $1,987
Used Chevrolet Camaro
451 Great Deals out of 31,416 listings starting at $1,450

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.