Vibration that is RPM related .. or so it seems - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 10-20-2019, 08:48 AM Thread Starter
PSN Newb
 
Joshua Barr's Avatar
 
Join Date: Oct 2019
Location: Saginaw Bay region Michigan
Posts: 9
Vibration that is RPM related .. or so it seems

Problem:

When cruising down the road approaching 1500 rpms in any gear you start to hear a faint howling sound and maybe even a buzzing like vibration in the floor and gas pedal. As rpms increase to 2000 it gets worse ( louder ). Once up to 2000ish rpms it fades maybe just a little but still very noticeable. This only happens when under load/throttle pedal down. If I get up to speed and cruise somewhere in the 1500-2000 rpm range and let off the throttle and coast the howling/buzzing goes away completely. I CAN recreate this at any speed.

I thought maybe it was the down pipe rubbing the firewall again but I dont think this is the case anymore after looking around at it again today. Unless there is significant movement while motor is under load and pushes it into it or the transmission or something. There is some space between the pipe and surround equipment but not very much at all.

Notable things:

Transmission was rebuilt 2.5k miles ago at reputable shop by previous owner so I don't know if this is a new thing or not.

EGBPV is still in place but no leaks and works as it should when cold

It runs great and will run with this but it is irritating after awhile
Joshua Barr is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 10-20-2019, 03:19 PM
PSN Local
 
Join Date: Aug 2019
Posts: 89
Re: Vibration that is RPM related .. or so it seems

Josh,

I'd check all the U-joints and bearings in the rear drive line to start with. Worse case would be something like this poster: https://www.powerstrokenation.com/fo...iveline-2.html

Cj

1997 F350 CCLB 7.3, Eaton Fuller RTO-6610, 4x4, 3.54, otherwise stock
cjfisher is offline  
post #3 of 5 (permalink) Old 10-21-2019, 06:47 AM
PSN Veteran
 
Blue-Truck-Nut97's Avatar
 
Join Date: Jan 2019
Location: Central New Mexico
Posts: 1,186
Re: Vibration that is RPM related .. or so it seems

Since the transmission has been out, I would advise checking your motor mounts. The 7.3 mounts can move forward and back, at which point metal to metal contact occurs, forward and rearward movement is prevented by the transmission mount.

Sometimes when changing the transmission the engine gets slid one way or the other, and when the motor mounts aren't put back to center, all kinds of funky noises happen.

Sent from my E6810 using Tapatalk
Blue-Truck-Nut97 is offline  
 
post #4 of 5 (permalink) Old 10-21-2019, 10:12 AM Thread Starter
PSN Newb
 
Joshua Barr's Avatar
 
Join Date: Oct 2019
Location: Saginaw Bay region Michigan
Posts: 9
Re: Vibration that is RPM related .. or so it seems

I'll have a look today! Thanks for the advice. I was kind of thinking something like that may cause an issue but never really pursued it.
Joshua Barr is offline  
post #5 of 5 (permalink) Old 10-31-2019, 06:52 AM
PSN Veteran
 
Join Date: Nov 2007
Location: Kamloops, BC. Canada
Posts: 3,302
Re: Vibration that is RPM related .. or so it seems

Id also check to see if any of the firewall heat shield is touching the Down Pipe, one of my trucks took me a while to figure that it was just touching intermittently. Actually rubbed a hole in the DP, that heat shield is some robust material.
Cheers,
j

Tan white tan 97 ECLB, D60 PMF, RSK SD springs front, airs bags rear, 4:10, intake, FFD 205/30s, DP 4 exhaust DIY E-fuel, ZF-5 now
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
B&W turnover 5th wheel with Anderson hitch.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

2012 VW Touareg TDi Rawtek exhaust Malone tuned.
JCart is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the PowerStrokeNation : Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome