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2013-14 Shelby GT500
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<blockquote data-quote="SteveWK" data-source="post: 16047522" data-attributes="member: 139323"><p>I bought the car 8/3/2012. I don't know the build date offhand.</p><p></p><p></p><p></p><p>It seems to happen mostly during a mild load at a steady speed; for example, 2,500 rpm in 4th driving down the road. It also has happen following WOT during the coast down.</p><p></p><p>This is how the symptoms progress.</p><p></p><p>1) Steady state driving the engine light will start to flash. Cylinders are not being dropped at this point according to the IDS.</p><p></p><p>2) After a period of time, seconds to minutes, cylinders will then begin to drop randomly.</p><p></p><p>3) After several minutes it will clear up on its own.</p><p></p><p>The only non-stock parts on the car are a 10% ATI balancer and Ford Performance twin 65 mm throttle body. These parts have been on the car for years. The stock tune is on the car. I do have a tune that works with the twin 65mm but the car still has misfires with that tune also. I had long tubes on the car, but several months ago put the stock exhaust back on including the cats. This is when the problems started.</p><p></p><p>I've asked Ford to check the EGR tube that attaches to the exhaust for leaks several times, but they haven't done it. That tube was disconnected and reconnected when the stock exhaust was put back on. The rear O2 sensors were installed after the stock exhaust was put back on. As I understand it the rear O2 sensors primary function is to monitor the health of the cats. The connectors for the rear O2 sensors were exposed to the elements for four years while the long tubes were on. The O2 sensors were in a box. If the rear O2s are malfunctioning that could cause the engine light to flash. The flashing engine light means the EEC thinks damage is being done to the cats. I'm theorizing that if the EEC thinks damage is being done to the cats, it may drop what it thinks are the offending cylinders. I do have tunes that turn off the rear O2s and cat protection. I can load one of those tunes, but I really need someone sitting next to me with the IDS to monitor all the cylinders for drops. Also, it makes me a bit nervous driving around with the no cat monitoring and the cats installed. Another possibility is the ATI harmonic balancer is not installed correctly affecting the crank position sensing. I think this is unlikely since it has been on the car for four years. Ford thinks it's the EEC. Again I think this is unlikely since this all started when the stock exhaust was put back on. I have mentioned this to Ford about a dozen times, but it seems to fall on deaf ears. They seem to rely on DTC codes almost exclusively. The diagnostic system is not perfect nor does it have logic for every possible failure. I think since the mechanic road with me in the car and was able to monitor everything while I drove, he is more likely to listen to me now.</p></blockquote><p></p>
[QUOTE="SteveWK, post: 16047522, member: 139323"] I bought the car 8/3/2012. I don't know the build date offhand. It seems to happen mostly during a mild load at a steady speed; for example, 2,500 rpm in 4th driving down the road. It also has happen following WOT during the coast down. This is how the symptoms progress. 1) Steady state driving the engine light will start to flash. Cylinders are not being dropped at this point according to the IDS. 2) After a period of time, seconds to minutes, cylinders will then begin to drop randomly. 3) After several minutes it will clear up on its own. The only non-stock parts on the car are a 10% ATI balancer and Ford Performance twin 65 mm throttle body. These parts have been on the car for years. The stock tune is on the car. I do have a tune that works with the twin 65mm but the car still has misfires with that tune also. I had long tubes on the car, but several months ago put the stock exhaust back on including the cats. This is when the problems started. I've asked Ford to check the EGR tube that attaches to the exhaust for leaks several times, but they haven't done it. That tube was disconnected and reconnected when the stock exhaust was put back on. The rear O2 sensors were installed after the stock exhaust was put back on. As I understand it the rear O2 sensors primary function is to monitor the health of the cats. The connectors for the rear O2 sensors were exposed to the elements for four years while the long tubes were on. The O2 sensors were in a box. If the rear O2s are malfunctioning that could cause the engine light to flash. The flashing engine light means the EEC thinks damage is being done to the cats. I'm theorizing that if the EEC thinks damage is being done to the cats, it may drop what it thinks are the offending cylinders. I do have tunes that turn off the rear O2s and cat protection. I can load one of those tunes, but I really need someone sitting next to me with the IDS to monitor all the cylinders for drops. Also, it makes me a bit nervous driving around with the no cat monitoring and the cats installed. Another possibility is the ATI harmonic balancer is not installed correctly affecting the crank position sensing. I think this is unlikely since it has been on the car for four years. Ford thinks it's the EEC. Again I think this is unlikely since this all started when the stock exhaust was put back on. I have mentioned this to Ford about a dozen times, but it seems to fall on deaf ears. They seem to rely on DTC codes almost exclusively. The diagnostic system is not perfect nor does it have logic for every possible failure. I think since the mechanic road with me in the car and was able to monitor everything while I drove, he is more likely to listen to me now. [/QUOTE]
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