Question about Cadillac Seville

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Im getting a readout of # 8 misfiring on a 2000 cad seville. of course since the engine is transverse mounted im assuming that the number 8 spark plug is in the side of the firewall- by drivers side. took plugs out and they look like they are not firing - could the coil be bad? and if so why just the #8 misfire on the .the gap is at 50 thousands. is there a way to test the coil on the bench

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The gap is perfectly fine - ideally it should be at .060.
Your engine has 4 coils - one for 2 cylinders. If the coil is bad both cylinders connected to that coil would be misfiring. Since on your case only one is then the problem is either in the high tension wire (it's broken - test it with an ohmmeter, or it shorts to the ground - check it by looking after the spark at night with the engine idling) or the spark plug itself it faulty - replace it.

Posted on Jul 28, 2010

  • hargos195928 Jul 28, 2010

    okay so i changed the spark plug on # 8 cylinder and it still shows misfir on # 8 on the code reader. next you say there are 4 coil packs ona 2000 seville. where are they located- because the only i see that might resemble a coil pack are only 2 packs standing side by side by the windshield wiper motor. one more thing when you remove the cover to replace plugs those units in the cover (4) one for each cylinder,looks like they are in some kind of hardened gel. isnt that were the spark is going to the plug. could that be bad

  • Azrael SRL Jul 29, 2010

    2 packs of 4 coils? In that case you have the older version, in which each cylinder has its coil. This is how one of the coil packs looks like
    As you can see you need 2 of those so you have correctly identified them. That system was replaced because if a coil fails you have to replace the entire pack . To test it you must take it out and check the resistance of the wiring inside the ignition coil with an ohmmeter - on a good coil it's about 2 ohms on primary and 400 ohms on the secondary. The high tension cable should have around 6ko, if it's below 4ko you have a short in the wire, over 10 ko it's broken. Either way you have to replace it.
    The gel is there to provide extra insulation against water, nothing else - you don't absolutely have to have it, you can put some hot glue there after you have replaced the high tension wire if you want.



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