2014 6.7 harmonic vibration at idle (dealer won't help) - Ford Powerstroke Diesel Forum
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Old 01-30-2014, 06:34 AM
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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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Old 01-31-2014, 03:37 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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Old 01-31-2014, 05:36 PM
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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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Old 02-01-2014, 08:07 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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Old 02-01-2014, 09:09 AM
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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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Old 02-09-2014, 03:30 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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