SPONSORED LINKS

1992 Cadillac Deville Missing

Tiny
SEAN030888
  • MEMBER
  • 1992 CADILLAC DEVILLE
  • 4.9L
  • V8
  • FWD
  • AUTOMATIC
  • 145,000 MILES
Hi I have a 1992 Cadillac Deville. It misses very badly. I can have my foot to the floorboard and all that happens is the motor just revs. I am changing the spark plugs today. I have one question and it is really bothering me when I pulled the plug out. It was burnt in the white area. What causes this. Here is a better picture. I took it out ran a lot better. It still has a miss somewhere but I will find it.
Image (Click to make bigger)
Thumb
SPONSORED LINKS
Wednesday, March 4th, 2015 AT 9:28 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check cylinders for compression a 20% variance between any cyclinder is not good. Check plug wires with an ohm meter, 5000 ohms per foot.
Was this
answer
helpful?
Yes
No
Wednesday, March 4th, 2015 AT 12:13 PM
Tiny
SEAN030888
  • MEMBER
  • 36 POSTS
I changed the plugs wires today and I changed the front spark plugs and opened the distributor cap. The rotor was burnt up. I didn't change the tears yet I know they are misfiring back their to. I will have my friend check the cylinder compression since he is a mechanic. Thanks.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, March 4th, 2015 AT 12:18 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It may be a head gasket or cylinder dropped as these are famous for that.
Was this
answer
helpful?
Yes
No
Wednesday, March 4th, 2015 AT 12:47 PM

Please login or register to post a reply.

Related Spark Plug Replace/Remove Content

Spark Plug Gap
VIDEO
Spark Plug Gap
Instructional repair video
Spark Plug Replacement
GUIDE
Spark Plug Replacement
A spark plug is a vital part of the engine's ignition system and is responsible for starting the combustion process. As a part of an engine tune up, spark plugs should ...
VIEW MORE

Sponsored links