1700rpm powerloss/vibration...injectors? - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 11-22-2012, 11:44 PM Thread Starter
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1700rpm powerloss/vibration...injectors?

When cruising on the highway i will get a power loss and a vibration at around 1500-1700rpm doing about 50-60mph. Vibration just started about a week or so ago and doesn't always happen. But the power loss at those rpms is becoming more frequent and almost constant now whenever im at that 50-60mph mark. I also have been seeing a huge drop in MPG. I was thinking maybe injectors?

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post #2 of 21 Old 11-23-2012, 12:17 AM
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Sounds about right. Mine did the same thing and I never broke 17 MPG on the highway and rarely seen above 12 in city/combined driving until I got my new injectors when I did gaskets and studs. Jesse explained to me that it was spool valves on the injectors that fail and cause the hesitation and bucking at 50-60 mph.

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post #3 of 21 Old 11-23-2012, 12:35 AM Thread Starter
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Sounds about right. Mine did the same thing and I never broke 17 MPG on the highway and rarely seen above 12 in city/combined driving until I got my new injectors when I did gaskets and studs. Jesse explained to me that it was spool valves on the injectors that fail and cause the hesitation and bucking at 50-60 mph.
Bryan, you've seen my rants lately about fuel economy and know my situation pretty well lol. This started happening a few weeks after my mpg drop if that has a difference? i did a little searching on the forums and there's a ton of posts about this "1700 rpm problem" i just went outside and set the truck back to a stock tune, warmed it up and took it for about a 8 mile round trip on the highway and it still has this power-loss at 1700 but the vibration toned down a bit as well now that its back to stock. Also i was giving it a few revs when i got back from the ride and noticed almost a light sputtering like sound coming from the truck in the higher rpms, is this related as well?
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post #4 of 21 Old 11-23-2012, 12:37 AM
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Very well could be injector related. However I would rule out batteries and FICM first before diving in and replacing the injectors.

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post #5 of 21 Old 11-23-2012, 12:46 AM Thread Starter
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Very well could be injector related. However I would rule out batteries and FICM first before diving in and replacing the injectors.
Good news is i am under warranty, bad news is i called my tech 2 days ago after guys on here responded with it being the ficm and my tech said its almost impossible for them to cover a ficm even with the warranty? he said like 9/10 guys have had to pay out of pocket? ive heard the ficm will still test ok even if it is shot? this could be it since i ran a scangauge2 on it yesterday and my volts were fine. Batteries tested fine about 3k miles ago at ford when it was in for service.
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post #6 of 21 Old 11-23-2012, 10:09 AM
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Well I would take it to them then and have them diagnose it. If it's injectors or FICM they should be able to tell.

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post #7 of 21 Old 11-23-2012, 11:42 AM
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Mine did that with a bad injector, including a rough idle.

Sent from my phone that somebody didn't help me get.

Unfortunately had to Sell my ......2004 KR CC SWB FX4 - Edge insight cts, blue spring upgrade, updated HFCM drain plug, XDP coolant filter, CAT EC-1 rated coolant, Custom Diesel EGR delete, CAT delete, Rotella T6

SEE MY OIL COOLER REPLACEMENT AND EGR DELETE - http://www.powerstroke.org/forum/gen...tml?highlight=
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post #8 of 21 Old 11-23-2012, 11:51 AM Thread Starter
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Got an appt with ford for next week...ill keep everyone updated
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post #9 of 21 Old 11-25-2012, 02:50 AM Thread Starter
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Just went out to start my start after sitting for 10hrs and had a horrible almost clunking noise coming from the motor for the first 30-45 seconds but the weird part is it cranked over right away in almost a split second?
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post #10 of 21 Old 11-28-2012, 03:33 PM
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Mine had the same misfiring vibration/bucking at the same RPM range and roughly same speeds. A decent 6.0 diesel repair truck shop found a misfiring injector and replaced it roughly 14,000 miles ago. I have had no problems since with injectors... knock on wood. But after replacing the injector, i had a clogged oil cooler, which i ended up at the time running too hot of oil to my injectors causing the injector failure. I have since cleaned and changed coolant, and oIl cooler, and deleted EGR system for longevity purposes. I Do not believe you need to replace ALL injectors if need be. They only replaced 1 of mine and it fixed the problem. Although if they dignosed a bad FICM it might be another story..

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