Coil pack?

ELKRIVERSCOTT

MEMBER
2003 CADILLAC DEVILLE
4.6L
V8
2WD
AUTOMATIC
68,000 MILES

Before I replace the cassette for a cylinder three misfire code might my problem be carbon build up. Have cleaned the throttle body. Also is the rear bank near the firewall called the LH pack?
The 2003 has a different system than the 2004 apparently.
Thanks much for reading. Good luck!

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,645 POSTS

Hi,

I attached a picture below showing the left and right sides of the engine. I'm not sure if you meant to say LH bank.

Cylinder 3 is located in bank 1 (right side in pic1). That would be near the firewall. Pic 2 shows cylinder 3 location.

Let me know if this is what you need.

Take care,

Joe

See pics below.

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Saturday, February 3rd, 2024 AT 5:16 PM

ELKRIVERSCOTT

MEMBER
4 POSTS

Yes, it's the left hand one nearest to the firewall. Thanks for reading.

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Saturday, February 3rd, 2024 AT 8:56 PM

JACOBANDNICKOLAS

MECHANIC
109,645 POSTS

Hi,

You are very welcome. Sorry, I missed the other question. If there is carbon buildup on a valve, it can cause a drop in compression. The easiest thing to do is to check engine compression on that cylinder to see if it is low.

Here is a link that explains how to check:

https://www.2carpros.com/articles/how-to-test-engine-compression

Let me know if that helps or if you have other questions.

Take care,

Joe

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Sunday, February 4th, 2024 AT 6:25 PM

ELKRIVERSCOTT