Truck accelerated on its own - Ford Powerstroke Diesel Forum
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post #1 of 32 Old 12-11-2012, 06:19 AM Thread Starter
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Truck accelerated on its own

This morning as I was backing out of my driveway the truck accelerated on its own as if I had floored it. Lucky I had my foot on the brake or I would have smashed into my house. I quickly turned the motor off, put in park and restarted. All was OK after that.....Scary...Left rubber on the pavement. It did this one other time a couple of months ago.
Running HD300 tunes.
Any ideas?
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post #2 of 32 Old 12-11-2012, 06:53 AM Thread Starter
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No Codes detected via H&S tuner.
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post #3 of 32 Old 12-11-2012, 07:29 AM
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Scary....Please keep us informed! Good luck!

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post #4 of 32 Old 12-11-2012, 07:40 AM
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You need to get this problem checked immediately before you get hurt or hurt someone else.

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post #5 of 32 Old 12-11-2012, 07:58 AM
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My throttle has been raising up to 1000 while rolling in the driveway or in a fast food drive through.. I had other issues so I took my truck into the shop.. I'll post up details when I find out something


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post #6 of 32 Old 12-11-2012, 08:09 AM Thread Starter
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Was thinking Throttle Position Sensor?????
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post #7 of 32 Old 12-11-2012, 08:09 AM
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Check your oil for fuel, you may be over full due to fuel dilution. If so you probably have a bad injector or two and your leaking fuel into the crank case, from then all it takes is getting a little bit of it sucked up by one or more of the pistons and then the engine won't know the difference it will burn that fuel just as if your giving it throttle. Turning it off won't stop it either until it burns all the fuel.
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post #8 of 32 Old 12-11-2012, 08:30 AM
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Mine will do it too sometimes. It doesn't leave burnouts but if I'm backing it into the driveway and hit the pedal lightly it will hold it about 1000 for a second which scared the crap out of me the first few times. Now I don't really even take notice. Not sure why it does this. Did it when it was stock at 15k miles and still does it occasionally now. I have actually gotten on it and the rpms hang after I let off for a second or two.

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post #9 of 32 Old 12-11-2012, 09:32 AM Thread Starter
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Quote:
Originally Posted by Eric@PTP View Post
Check your oil for fuel, you may be over full due to fuel dilution. If so you probably have a bad injector or two and your leaking fuel into the crank case, from then all it takes is getting a little bit of it sucked up by one or more of the pistons and then the engine won't know the difference it will burn that fuel just as if your giving it throttle. Turning it off won't stop it either until it burns all the fuel.
I will check that ..... But this truck was warming up for like 4-5 minutes before I got in and put in reverse with my foot on the brake.Then gave a light touch on throttle to get her moving and then back on the brake..it started accelerating as I started moving backwards. Turned off the motor with key immediately and restarted in park...No problem.
If I had a leaking injector that leaked into the crankcase....wouldn't it have burned away any excess fuel during the warmup?
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post #10 of 32 Old 12-11-2012, 09:42 AM Thread Starter
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Quote:
Originally Posted by travisH3 View Post
Mine will do it too sometimes. It doesn't leave burnouts but if I'm backing it into the driveway and hit the pedal lightly it will hold it about 1000 for a second which scared the crap out of me the first few times. Now I don't really even take notice. Not sure why it does this. Did it when it was stock at 15k miles and still does it occasionally now. I have actually gotten on it and the rpms hang after I let off for a second or two.
Mine was on its way to WOT.....was not going to stop at 1000rpm as it was past that when I turned off the motor.
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