2000 Deville Ignition Coil

[pauleywog1]

Hi all, Just bought my first Caddy, a 2000 Deville. It's an awesome ride but I'm guessing it wasn't maintained 100%. It's missing bad so I put the scanner on it and it showed a bad 3rd cylinder. I put a set of plugs in but it didn't help. Is there a way to check the coils rather than shell out $250 for an ignition pack?Thanks in advance.

[JimD]

You could swap the ignition packs between banks and see if the miss moves also.

I suspect you can remove individual coils but I'm not sure if GM has a part # for individual coils.

[Cadillac Jim]

The plug wires are a lot more likely to be a problem than the coils. It could also be a crank or cam sensor, or one of the ignition modules. The first thing to do is to run the OBD II codes. Here's how:

<a href="http://www.caddyinfo.com/readingcodes.html" target="_blank">http://www.caddyinfo.com/readingcodes.html</a>

The codes will be in the form of a three-letter prefix, followed by the main code which is a letter and four numerals, and followed by History of Current, as

PCM P0016 History

or

PCM P0305 Current

Post the codes here. The codes of immediate interest are the ones beginning with P. The codes will likely tell the tale.

[Ranger]

Might try something like this.

http://www.thetoolwarehouse.net/shop/WAE-76560.html

[Logan]

To really test. You would need the Kent Moore Olds Quad 4 spark plug COP harness.

The coils are replaced as a bank. There are 2 different ones. Black for rear bank, silver for front bank.

They are interchangeable.

I carry a spare coil bank in my trunk.

Here is one on eBay:

http://cgi.ebay.com/ebaymotors/CADILLAC-4-...sspagenameZWDVW

[95SevilleSLS]

The plug wires are a lot more likely to be a problem than the coils. It could also be a crank or cam sensor, or one of the ignition modules. The first thing to do is to run the OBD II codes. Here's how:

<a href="http://www.caddyinfo.com/readingcodes.html" target="_blank">http://www.caddyinfo.com/readingcodes.html</a>

The codes will be in the form of a three-letter prefix, followed by the main code which is a letter and four numerals, and followed by History of Current, as

PCM P0016 History

or

PCM P0305 Current

Post the codes here. The codes of immediate interest are the ones beginning with P. The codes will likely tell the tale.

His year won't have plug wires though. I had a horrible miss once on my 95 seville SLS after I had washed the engine. It pissed me off! I could not find it. Come to find out, someone had clamped the engine cover on one of the spark plug wires exposing it. Very easy fix. I should have checked it first!

[pauleywog1]

Thanks to all for the replies, good info. Thanks Logan, very helpful. I've had a pile of vehicles over the years and still do my stuff like brakes, shocks, odds and ends, etc. This car is a different animal but I'm learning.