Sudden power spike!!! - Ford Powerstroke Diesel Forum
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Old 02-16-2013, 05:37 PM
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Sudden power spike!!!

Exactly what the title says. Driving home tonight on the expressway doing 65 every time I would use my turn signal my rpms would spike really quick from 2000 to 2300 (or so) and back to 2000. Only when I would use my turn signal. I could also hear it and feel it. Electrical prob? Anyone ever heard of this happening? I'm stumped
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Old 02-16-2013, 06:18 PM
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Did the motor go up in rpm as well or just the tach?
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Old 02-16-2013, 06:39 PM
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Sudden power spike!!!

Probably torque converter unlocking...check for any bulbs that might be out. Or did you add any LED bulbs recently?? These trucks are very sensitive to that kind of stuff. There are several threads on this forum about exactly your problem.


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Old 02-17-2013, 05:42 AM
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Little background, 97 F350 XLT 4dr 8' box 7.3 automatic 145k stock everything. Bought it last week. Pic and updated profile coming, just joined. Kris, motor went up in rpms too. I haven't done anything to the truck but the previous owner said he had to replace the dash not to far back. Ya this purchase was one of those u really had to trust what the guy was saying bout actual mileage cause it couldn't be proven. Thanks
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Old 02-17-2013, 05:57 AM
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Sudden power spike!!!

Second checking bulbs. Especially the 3rd brakelight on cab


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Old 02-17-2013, 06:06 AM
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So a bulb being out could cause this prob?
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Old 02-17-2013, 06:10 AM
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Sudden power spike!!!

I dont recall exactly the details. But the blown bulb on 3rd brakelight, and possible other bulbs to in lighting system, can cause the torque converter to act funny. Somehow they are tied together.


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Old 02-17-2013, 06:24 AM
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The TC will unlock when you tap the brakes. Not sure if it's a signal from the brake pedal, brake lights, or what, but it's interconnected. So, if you're turn signal is making it unlock, then I'd assume it's tied to the bulb.
Just check your bulbs for all proper operation first.
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