2014 6.7 harmonic vibration at idle (dealer won't help) - Ford Powerstroke Diesel Forum

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post #1 of 10 Old 01-30-2014, 05:34 AM Thread Starter
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2014 6.7 harmonic vibration at idle (dealer won't help)

Bought a new 2014 f250 crew cab fx4 last part of October 2013. Noticed what I call a resonating or harmonic vibration in steering wheel and pedals at 560 miles. Tail pipe and bed also shake a fair amount compared to my friends trucks. About twice as bad. Occurs only at idle. Smooths out with any increase in rpms and runs fine. Dealer said its a customer opinion. That I'm just not used to the way a diesel feels. Only problem is I've felt upwards of 20 of these trucks since I noticed the problem and they all idle smooth. Returned to dealer at 990 miles. Was told I need to put 10,000 miles on it to break in motor mounts. Problem still hasn't been documented. Now I'm at 1700 miles and it is still doing it. Sometimes better, sometimes worse. Seems a tad worse when it's cold outside, but engine temp has no bearing. Even warmed up to 180-200 degrees it's just as bad while sitting at stoplights and such. Dealer says unless it's throwing a code, ford won't let him touch it. 100% stock. No heavy towing. Hasn't been off-road. Had a diesel guy tell me he thought possibly an injector problem and ECM is trying to compensate. Any suggestions?
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post #2 of 10 Old 01-31-2014, 02:37 PM
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got any way of putting a heavy load behind it at working it pretty hard for several hours straight?
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post #3 of 10 Old 01-31-2014, 04:36 PM Thread Starter
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Most I have available is about 8,000 worth of my personal stuff. Talked to the guy at dealership and he said they did run diagnostic on injectors and they were all firing evenly. What are u thinking?
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post #4 of 10 Old 02-01-2014, 07:07 AM
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When engines are new, there are always variations between cylinders and the rate at which they wear in and produce full power. No load/light load operation simply adds to the time it takes.
8K isnt much, load it up and run the crap out of it. Don't be scared to get the boost up and KEEP it up. Just spooling it up and letting off really doesnt help much. Its constant load that really gets an engine broken in.
If you can get some chassis dyno time for a reasonable price, I would do that. Put several hours on the engine at various loads from about 50% to 75%, but not just a quick pull and back down, but pull on it and hold it there for 10-15 minutes.
On our engine dynos, we see similar things and after out 4 hours at full power/speed they smooth out.
If it still does it after that, you can tell the dealership you did your part, now its on them to find any other issues.
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post #5 of 10 Old 02-01-2014, 08:09 AM Thread Starter
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Thanks for the reply. Getting close to ATV time. I'll load it up and give her hell. Can prob get my rig up to around 9500 if I fill it with water and take my big quads. Kinda my only option at this point.
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post #6 of 10 Old 02-09-2014, 02:30 AM
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Hi...I have a 2013 F250 6.7 XLT and at at idle I feel that same vibration. The 2012 F350 XL single cab I traded was two years old never had the vibration at an idle. I will give it time since I only have 2800mi on it now.
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post #7 of 10 Old 04-18-2015, 06:47 AM Thread Starter
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Still having my harmonic vibration issue. Truck now has almost exactly 14,000 miles. It's actually a tad worse now with accumulated miles. Dealer still won't help. Had a ford engineer from Kentucky allegedly fly in to inspect it after months of complaining and begging for help. Kept my truck a day. The verdict was: 1) Yes it's vibrating and 2) Its within spec. Ok, what is the spec and what's causing the vibration? No answer on either question. The problem is that it gets better and worse as you drive the thing. Sitting in the shop it prob passes whatever magical number they feel people can live with. But once you put it under load a time or two it will become annoying. They literally care nothing about me or my truck. I'm just the sucker who paid 60k for a truck that started acting like it had 100,000 miles on it before I even got my fu@$ing tag. Never again. Customer service is garbage. Adam Coots (Kentucky engineer) is garbage. I've never been treated as such by any company. My buddy at work who owns this same truck had a radiator start leaking yesterday. This will be what the future holds for all of us probably. Known issue.... yet screw you all. We may do you a solid and only charge you 900 bucks instead of 1800 when your radiator pops at 37,000 miles. FANtastic!
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post #8 of 10 Old 04-18-2015, 08:05 AM
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"Wait for the motor mounts to break in"? That's the most stupid thing I've heard in a while. Have you tried a different dealership. Some really don't have good diesel tech and others have great ones. Or even a good independent diesel shop. Somebody on here must know of someone in your area. If somebody finds what the problem is, Ford is gonna have to pay for it. I don't know what kind of Lemon Laws you have in your state but, at least here, if you keep at them they will eventually have to buy your truck back. I don't know man but seems as if you're gonna have to be the very squeaky wheel

Good luck!

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post #9 of 10 Old 04-19-2015, 05:19 PM
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I know you are trying to find the culprit, but what about adding a fluidampr?

2012 F-350 supercab long bed srw lariat tuxedo black
MBRP 5" dp-back exhaust (thermal coated) with RBP 6" tip, AFE pro-dry s cold air intake, H&S mini maxx, H&S EGR delete, RBP rx3 nerf bars, RBP fender emblems, RBP rx2 grille with color matched grille surround, AMI color matched locking fuel lid
Soon to install..
RBP rear bumper, RBP front winch bumper w/ Warn 16.5ti, Icon 4.5" stage 3 suspension, Icon steering stabilizer/shocks, 35"x12.5" nitto trail grapplers, RBP Revolver 20" wheels
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post #10 of 10 Old 04-20-2015, 05:26 AM Thread Starter
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I haven't tried anything mechanical as of yet besides moving vibrating transmission and fuel lines, tweaking all the mounts and exhaust to ensure no awkward tension, stuff like that. I did replace the fan with another oem fan because the old one looked warped from my perspective. The new once had way less counter weight machined into it, but after it was all said and done there was no difference. I did start the truck with the serpentine belt off and it appeared to be vibration free. However, no way to drive it to be sure. So maybe the fluidampr could be the answer to my problems. Ford swears there are no internal problems with my motor and it has always run perfect. Can anyone explain the dynamics of why it would "need" a damper, yet not have any actual problems brewing in the crank, bearings, etc?
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