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2013-14 Shelby GT500
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<blockquote data-quote="SteveWK" data-source="post: 16048032" data-attributes="member: 139323"><p>Good point. I do remember that being mentioned here before. The car has 23k miles on it. The plugs have been changed 5 to 6 times by me and gapped at 0.028. They were one of the recommended NGKs. The part number escapes me at the moment. Never had a problem with them. I had a set of stock plugs and gave them to the dealer anticipating they would want to change them. I'm not sure where they gapped them but the car is misfiring and behaving the same as it did with the NGKs. I don't think the plugs are the problem.</p><p></p><p></p><p></p><p>Hopefully I can get him to ride with me tomorrow and I'll flash the EEC with a Lund tune that turns off the cat protection and rear O2 sensors. He can then monitor the cylinders with the IDS. If none of them drop, then that points to the rear O2 sensors. I know the EEC monitors the health of the O2 sensors and will throw a code if it detects a problem. But I doubt it is smart enough to detect a corrupted signal. This problem started when the stock exhaust was put back on and that meant reinstalling the rear O2 sensors. Then again I could be completely wrong, and it is the crank sensor like you said, or the balancer was never installed correctly, or the ECU is hosed, or .....</p><p></p><p>The mechanic does know the history, but I will remind him again tomorrow. He also thinks that since the ECU is considered part of the emissions system it has an 8 year/80,000 mile warranty. </p><p>Replacing it wouldn't cost me anything if that is the case. </p><p></p><p>My 4.10 install is waiting on getting this problem resolved. So, you can only imagine the stress it is adding to my life <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> .</p></blockquote><p></p>
[QUOTE="SteveWK, post: 16048032, member: 139323"] Good point. I do remember that being mentioned here before. The car has 23k miles on it. The plugs have been changed 5 to 6 times by me and gapped at 0.028. They were one of the recommended NGKs. The part number escapes me at the moment. Never had a problem with them. I had a set of stock plugs and gave them to the dealer anticipating they would want to change them. I'm not sure where they gapped them but the car is misfiring and behaving the same as it did with the NGKs. I don't think the plugs are the problem. Hopefully I can get him to ride with me tomorrow and I'll flash the EEC with a Lund tune that turns off the cat protection and rear O2 sensors. He can then monitor the cylinders with the IDS. If none of them drop, then that points to the rear O2 sensors. I know the EEC monitors the health of the O2 sensors and will throw a code if it detects a problem. But I doubt it is smart enough to detect a corrupted signal. This problem started when the stock exhaust was put back on and that meant reinstalling the rear O2 sensors. Then again I could be completely wrong, and it is the crank sensor like you said, or the balancer was never installed correctly, or the ECU is hosed, or ..... The mechanic does know the history, but I will remind him again tomorrow. He also thinks that since the ECU is considered part of the emissions system it has an 8 year/80,000 mile warranty. Replacing it wouldn't cost me anything if that is the case. My 4.10 install is waiting on getting this problem resolved. So, you can only imagine the stress it is adding to my life :) . [/QUOTE]
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