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2011-2014 Mustangs
2011-2014 Mustang Talk
Strangest Problem in the World
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<blockquote data-quote="03blackvert" data-source="post: 16183099" data-attributes="member: 4827"><p>My father has a 2013 Mustang GT that has what I describe as the strangest problem in the world. We've had two dealerships and about 5 techs look at it and no one can diagnose the issue. I'm hoping some of the brains on here can maybe give some ideas, tips, or tricks.</p><p></p><p>The symptom is simple. Won't start. Put the key in, turn it, and nothing. No noise, no trying to start. The dash comes on as you pass "on" of course, but then moving the key to start does nothing. This happens randomly. It will go 2-3 weeks without doing it, and then it will do it 3 times in a row.</p><p></p><p>First thought, clutch position sensor. That was replaced a long time ago, the switch on the pedal, no change.</p><p></p><p>From there, it gets weird. When this happens putting a "jump start pack" on the car will usually (but not always) make it start. Now, the battery tests 100%, and we've checked the voltage with a meter it's right where it should be. But somehow the jump start pack makes the difference.</p><p></p><p>It also push-starts fine. Push it down a hill, pop the clutch, off it goes. When this happens you can immediately shut it off and restart it with the key normally 100% of the time.</p><p></p><p>Second thought, dealer found a bunch of codes as if someone had tried to start it with the wrong key. They reprogrammed both keys (at a discounted rate, nice of them) to see if that made any difference. Nope, happened with both keys since that time.</p><p></p><p>Of course, having left it with the shops a couple of times now it will never happen when it's in their possession and they can troubleshoot while it's doing it. They seem almost as frustrated as we are with the car!</p><p></p><p>I'm thinking the anti-theft is likely not the culprit or it wouldn't push-start, since I believe that system kills the spark if the keys are right. I'm actually thinking the most likely cause is a bad electronic part in the ignition system, some sort of failing chip or micro-fractured board. This would explain the jump-pack sometimes fixing it, as it puts out more like 13.5v rather than 12.5 the battery sits at, perhaps just enough to goose it to life. I guess it could be a bad ignition switch or something else though.</p><p></p><p>But what I really need is ideas here. Obviously we could just start replacing things randomly until we find the issue, but some of them like the main computer are $$$$. I don't know if there's things I could probe with an ODB tool when this happens, or test points to hit with a meter, or anything else that would be useful. How would you further troubleshoot this bizzaro problem?</p></blockquote><p></p>
[QUOTE="03blackvert, post: 16183099, member: 4827"] My father has a 2013 Mustang GT that has what I describe as the strangest problem in the world. We've had two dealerships and about 5 techs look at it and no one can diagnose the issue. I'm hoping some of the brains on here can maybe give some ideas, tips, or tricks. The symptom is simple. Won't start. Put the key in, turn it, and nothing. No noise, no trying to start. The dash comes on as you pass "on" of course, but then moving the key to start does nothing. This happens randomly. It will go 2-3 weeks without doing it, and then it will do it 3 times in a row. First thought, clutch position sensor. That was replaced a long time ago, the switch on the pedal, no change. From there, it gets weird. When this happens putting a "jump start pack" on the car will usually (but not always) make it start. Now, the battery tests 100%, and we've checked the voltage with a meter it's right where it should be. But somehow the jump start pack makes the difference. It also push-starts fine. Push it down a hill, pop the clutch, off it goes. When this happens you can immediately shut it off and restart it with the key normally 100% of the time. Second thought, dealer found a bunch of codes as if someone had tried to start it with the wrong key. They reprogrammed both keys (at a discounted rate, nice of them) to see if that made any difference. Nope, happened with both keys since that time. Of course, having left it with the shops a couple of times now it will never happen when it's in their possession and they can troubleshoot while it's doing it. They seem almost as frustrated as we are with the car! I'm thinking the anti-theft is likely not the culprit or it wouldn't push-start, since I believe that system kills the spark if the keys are right. I'm actually thinking the most likely cause is a bad electronic part in the ignition system, some sort of failing chip or micro-fractured board. This would explain the jump-pack sometimes fixing it, as it puts out more like 13.5v rather than 12.5 the battery sits at, perhaps just enough to goose it to life. I guess it could be a bad ignition switch or something else though. But what I really need is ideas here. Obviously we could just start replacing things randomly until we find the issue, but some of them like the main computer are $$$$. I don't know if there's things I could probe with an ODB tool when this happens, or test points to hit with a meter, or anything else that would be useful. How would you further troubleshoot this bizzaro problem? [/QUOTE]
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