Spark plug numbering needed?

Tiny
VIGAN
  • MEMBER
  • 2011 CADILLAC ESCALADE ESV
  • 6.2L
  • V8
  • AUTOMATIC
  • 100,000 MILES
I have to change spark number 5 because it is misfiring. Wondering which one it is.
Tuesday, January 10th, 2023 AT 7:23 AM

1 Reply

Tiny
AL514
  • MECHANIC
  • 4,632 POSTS
Hello, here's the cylinder layout for the vehicle. Are you getting a p0305? There is a Technical Service Bulletin on cylinder misfire codes due to carbon build up on the top of the valves. So, if a new spark plug and ignition coil don't fix the issue, you may have to look into a compression issue. Excessive carbon on top of the valves causes them to not close all the way causing a compression issue. it will be more noticeable on cold start up. With the use of Direct injection fuel systems now, most dealerships offer a valve cleaning service.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough
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Tuesday, January 10th, 2023 AT 10:39 AM

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