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Ask Dan Your Own Question
Dan, Technician
Category: Cadillac
Satisfied Customers: 24211
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Misfire in cylinder 6&8, Steady 127,000, 2001 Seville sts

Customer Question

Misfire in cylinder 6&8
JA: How many miles are on the car? Is it a steady misfire? Or random?
Customer: Steady 127,000
JA: What is the model/year of your Cadillac?
Customer: 2001 Seville sts with the north star
JA: Are you fixing your Seville yourself? What have you tried so far?
Customer: Nothing yet, just scanned it and found out it's 6&8. Yes fixing myself
JA: Anything else you want the mechanic to know before I connect you?
Customer: Had a major tune up about a year ago
Submitted: 7 months ago.
Category: Cadillac
Expert:  Dan replied 7 months ago.

Hello, my name is ***** ***** I'm here to help get your problem solved.

Expert:  Dan replied 7 months ago.

Does check engine light flash while driving?

Customer: replied 7 months ago.
Customer: replied 7 months ago.
Thank you for responding quickly
Customer: replied 7 months ago.
1200 rpm there's a vibrationbut only at 1200. Light blinks while driving
Customer: replied 7 months ago.
Just found out it's just cylinder 6
Expert:  Dan replied 7 months ago.

This would most likely mean the ignition coil has failed. You can connect a spark tester to see if coil rail is giving out weak spark on that cylinder, if so then this would verify the problem. I would feel pretty confident with just replacing the coil. Let me know if you have more questions, thanks.