Misfire in the #8 cylinder


Asked by Oct 27, 2013 at 12:29 PM about the 2006 Cadillac STS V8 RWD

Question type: Maintenance & Repair

I have a misfire in the #8 cylinder. I changed the sparkplugs and the ignition coil and I
have the misfire. I checked the compression in the cylinder and it is up to par.
Checked to
ensure that there is 12v going to the injector that's fine. I also have a code for the
converter. Two questions: Could the catalytic converter cause the misfire and if not,

3 Answers


No, but the catalytic converter probably failed because of the misfire. When an engine misfires raw fuel is dumped into the exhaust system. The raw fuel gets burned up in the hot catalytic converter and ruins the catalyst. Since everything on #8 checks out you most likely have a bad fuel injector on cylinder #8. It's most likely not spraying fuel. No fuel = misfire. HTH. -Jim

3 people found this helpful.

I have the same problem mis fire#8.switched coils still there. No other lights on. Do.

3 people found this helpful.

05 sts v8

1 people found this helpful.

Your Answer


Looking for a Used STS in your area?

CarGurus has 697 nationwide STS listings starting at $1,200.


Cadillac STS Experts

  • #1
  • #2
  • #3
    Tom Demyan
View All

Related Models For Sale

Used Cadillac CTS
173 Great Deals out of 8,000 listings starting at $2,150
Used Cadillac DTS
39 Great Deals out of 1,357 listings starting at $2,995
Used Cadillac SRX
279 Great Deals out of 8,727 listings starting at $2,900
Used Cadillac STS-V
18 listings starting at $8,329
Used Cadillac CTS-V
5 Great Deals out of 525 listings starting at $7,500
Used Chrysler 300
313 Great Deals out of 19,328 listings starting at $1,899
Used Dodge Charger
242 Great Deals out of 32,689 listings starting at $1,800
Used Cadillac Escalade
209 Great Deals out of 11,975 listings starting at $2,500
Used Cadillac DeVille
1,272 listings starting at $1,988
Used Chevrolet Impala
397 Great Deals out of 25,595 listings starting at $799

Used Cars For Sale

2008 Cadillac STS V8 RWD For Sale
37 listings starting at $5,950

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.