Hello, where did you find burn marks on the coil pack? I can see the coils are built in one unit that has Ignition Logic or control module built in as well. Sometimes if you end up with a coil pack like this that has actual carbon track down the side, that means the coil(s) were being over worked. A lean air fuel mixture will cause a coil to over work because air is the biggest resistance to electricity. So it could be that one of more injectors are not flowing well, or an input sensor could be causing the engine computer (ecm) to lean out the mixture. Plus it also looks like this car has a turbo, so a turbo is going to force more air than a conventional system. But first thing to do about the no start is to check the coil packs Power feed and Ground, and then the ecm controls for the pack. Ill post a diagram below of the wiring for the coil.
It would be best to check this with a multimeter so you are sure youre getting a full 12 volts to the coil and also measuring the ground voltage drop.
The Violet/DarkBlue wire will be the 12 volt feed with the key in the On position. The Black wire testing from it to battery negative should be close to zero, Thats voltage drop on the negative side of the coil. Check those first.
Also check the Fuse number 9 (15 amp) on diagram two. thats the coils power feed coming from the Powertrain Relay. You might need to try it Cranking as well.
If that fuse is blown, you will need to check the resistance of the Fuel Injectors too, because the fuse 9 feeds them as well..The Fuel Injectors should be 11 to 14 Ohms with the multimeter set on the resistance setting. Start there and i will get the Coil Control wiring diagram for you as well. You can check that with an LED automotive test light, it should be low resistance test light because we dont know exactly how the ecm controls these coils, its most like just a low current pulse signal to the coil pack.
There is a Coil Pack Torque spec and warning concerning the fasteners.
Ok there are 2 Technical Service Bulletins on the Coil Packs. Pages 6 and 7 is a TSB about the Coil Pack connector needing to be replaced, there is a part number on there as well, so they may have an upgraded connector for the Ignition Coil Pack.
The 2nd TSB is about damage to coil pack due improper Service or removal of the coil pack and breaking the boots (towers) off by removing the pack improperly. Hopefully that didnt happen. Im not sure how many times you had the new pack off so far..
Do you know if there were any codes stored in the engine control module, was the check engine light on at any time?
Sorry but have found more bad news.. It seems these cars have an issue with multiple coil failures due to either faulty ECM wiring or faulty ECMs, Ill post all the information below. Will be from pages 11 onward. But still do the power feed checks to the Coil Pack to start with.
https://www.2carpros.com/articles/how-to-use-a-voltmeter
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
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Wednesday, July 6th, 2022 AT 11:32 AM
