Just bought F350- grinding noises? - Ford Powerstroke Diesel Forum
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Old 04-08-2013, 06:23 PM
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Just bought F350- grinding noises?

I bought a 2001 F350 with the powerstroke and 6 speed last week. It has 211000 miles, and I had it checked out by a mechanic, and every thing seemed to be about perfect. Since I picked it up, I've probably driven 400 miles with no issues. It starts fine, has power, ect, but just starting today, It makes a grinding noise at various RPM range. In neutral, it starts grinding right at 2000 rpm, but when you are driving down the road, it will start grinding at 1000-1500 rpms. My first guess is that it's the turbo, but I'm not sure. How would I go about diagnosing these issues?

Also, this morning, before the truck started making the new noise, I was idling the truck while jump starting a backhoe, and even with the truck at operating temp, the rpm's were swinging between 500 and 1100 rpms. Is this normal?
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Old 04-09-2013, 04:32 AM
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Sounds like ICP if the idle is jumping around. That's a pretty big swing in revs though. Pull the plug on the ICP and see if there is oil on it. If so its junk. That wouldn't explain the grinding noise though. Where does it sound like its coming from? Motor or trans?


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Old 04-09-2013, 04:44 AM
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Engine compartment- it's hard to be more specific than that, but I think either passenger side, or near the turbo. It's not the tranny, it will make the noise while stopped with the clutch in.
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Old 04-09-2013, 04:56 AM
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Yeah that's a hard one to call without hearing it. If you think it's a turbo pull the intake tube off and check it. Any up and down or in and out play is bad. Or if the blades are chewed up


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Old 04-09-2013, 04:56 AM
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Also, I noticed when the engine was idling, and would jump up to higher rpms, if I tapped the fuel peddle and let off, the rpms would drop off for a bit, back down to 500.
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Old 04-09-2013, 05:41 AM
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Do you have the e brake set? If so its just going to high idle which is perfectly normal


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Old 04-09-2013, 05:42 AM
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When you said the Rpms were jumping upto 1100 I thought you meant a fast jump and then back down again. Sorry forgot to ask!


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Old 04-09-2013, 06:09 AM
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Quote:
Originally Posted by 350 ONE TON View Post
Do you have the e brake set? If so its just going to high idle which is perfectly normal


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E brake set. As I understand it, the high idle is to help it warm up when it's cold, in this case the engine was warm. Unless it had something to do with jump starting the backhoe?
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Old 04-09-2013, 04:18 PM
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Quote:
Originally Posted by TempestV View Post
E brake set. As I understand it, the high idle is to help it warm up when it's cold, in this case the engine was warm. Unless it had something to do with jump starting the backhoe?
The motor will automatically go into "high idle" when the ebrake is set and the truck is in park. Did you check the turbo for shaft play?


Tom
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Old 04-10-2013, 05:38 AM
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I got a chance to check the compressor wheel for play last night, and there is the slightest of play side to side, none front to back. Here is the wheel:


I'll see if I can get video of the sound tonight, but in the meantime, this is pretty much what my truck is doing-
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