Weird Vibration at Idle - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 12-06-2019, 10:42 AM Thread Starter
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Weird Vibration at Idle

My 2013 F350 has recently developed a consistent vibration once it has warmed up but only at idle. It’s like the normal diesel vibration but worse and is most noticeable in the brake pedal (it massages my foot). You can feel it all over but not to the point of driving me crazy, except the brake pedal. Once you increase RPMs it seems to smooth out. Truck is stock with 122k miles. Only code is a P20BA (DEF heater) which I keep clearing until I get deleted next month. Other than vibration, truck runs great. Appreciate any suggestions.

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post #2 of 8 Old 12-08-2019, 05:43 AM Thread Starter
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Nobody ever heard of this?

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post #3 of 8 Old 12-08-2019, 08:54 AM
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Never heard of it before, but that doesn't mean much. You say the vibrations stop when the RPMs go up, does it do the same thing at a stop light? Does it vibrate just like at idle? Maybe engine mounts, suspension bushings, etc. Really could be a lot of things.

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post #4 of 8 Old 12-08-2019, 01:30 PM Thread Starter
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Originally Posted by lowmpg View Post
Never heard of it before, but that doesn't mean much. You say the vibrations stop when the RPMs go up, does it do the same thing at a stop light? Does it vibrate just like at idle? Maybe engine mounts, suspension bushings, etc. Really could be a lot of things.
Yes it’s only at idle. Everything is normal until you come to a complete stop. It doesn’t matter if it’s in drive or park. What’s the best way to test engine mounts? They seem tight by hand

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post #5 of 8 Old 12-08-2019, 10:15 PM
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Motor mount?

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post #6 of 8 Old 12-09-2019, 09:40 AM
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Quote:
Originally Posted by fordman kev View Post
Yes it’s only at idle. Everything is normal until you come to a complete stop. It doesn’t matter if it’s in drive or park. What’s the best way to test engine mounts? They seem tight by hand
If vibration is felt everywhere in the cab but only at idle seems like it is a motor mount (like others have already said) and most likely the left side (drivers side) mount. If it is the motor mount the problem wouldn't be that it's bolts are not tight but rather the rubber/poly component that provides the vibration isolation has failed so the motor is resting metal on metal at idle and transferring the motor vibrations into the chassis/cab. If the rubber/poly component has failed you should see movement in the motor mount when try to jack the motor up slightly.
I say the left side mount because motor torque will cause the motor to lift on the left side. Back in the day if broke those stock motor mounts on your modded motor it was always the left side mount and sometimes would cause issues with accelerator pedal sticking, lol.

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post #7 of 8 Old 12-09-2019, 10:31 AM Thread Starter
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I’m planning to let a shop look at it this week. I’ll update if they find anything.
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post #8 of 8 Old 12-09-2019, 03:28 PM Thread Starter
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So I took my truck by a local shop today and he is sure it’s my body mounts and possibly a motor mount. Gonna let him replace them as well as weight reduction next month.

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