Vacuum pump assistance
Thread Starter
|
Senior User
Joined: Feb 2010
Posts: 212
Likes: 0
From: Alton
Vacuum pump assistance
I think I am on the right track here and I just wanted some reassurance that I am.
Recently I have noticed a loud buzzing noise from under the hood. Traced it down to the vacuum pump. It will cycle on nearly every time I am in wait to start mode. I have also started hearing a noise from my HVAC like a light shuddering noise when I am switching to different modes.
So far my 4 wheel drive had engaged every time I have asked of it, but I am thinking I have a slow leak causing the pump to cycle each time upon start up and the shuddering noise.
My guess like everyone else would be ESOF hubs right?
Thank you I just want to make sure I am on the right track.
If correct I will most likely be switching to some manual hubs and cap off the ESOF hubs.
Thank you all for any help or corrections.
9905
Recently I have noticed a loud buzzing noise from under the hood. Traced it down to the vacuum pump. It will cycle on nearly every time I am in wait to start mode. I have also started hearing a noise from my HVAC like a light shuddering noise when I am switching to different modes.
So far my 4 wheel drive had engaged every time I have asked of it, but I am thinking I have a slow leak causing the pump to cycle each time upon start up and the shuddering noise.
My guess like everyone else would be ESOF hubs right?
Thank you I just want to make sure I am on the right track.
If correct I will most likely be switching to some manual hubs and cap off the ESOF hubs.
Thank you all for any help or corrections.
9905
Senior User
Joined: Jan 2005
Posts: 165
Likes: 0
From: Crook county, Illinois
I can't help with the 4wd question, but in my situation on my 2WD, my pump would do the same as you described on wait to start, & it turned out the pump had come off the bracket. I got the rubber feet snapped back to the bracket, all's been quiet. I must of knocked it when I was under the hood tinker'n.
Posting Guru
Joined: Jan 2013
Posts: 2,215
Likes: 2
From: North Lake Tahoe
Mine will also turn on as I turn the key for wait to start, I will hear kick on as mine is somewhat loud. I have manual 4X4 locking hubs, non of that auto stuff. If your auto hubs are leaking it would be inside the wheel hub assembly, I think. I believe its a yellow pretty large in size o-ring, there is a whole write up of it some where on this forum. If it's working fine I wouldn't mess with it. As far as I know the only reason the diesels have vacuum pumps is for the heater/AC controls and the auto 4X4.
Posting Guru
Joined: Oct 2012
Posts: 1,910
Likes: 2
From: Hat Creek Ca
It would be normal for the pump to run on start up, the vacuum reservoir won't hold forever. As for the shuddering it could be the "door" dragging when switching from defrost to the vents for dash or floor.
Thread
Thread Starter
Forum
Replies
Last Post
TooHuge
1999 - 2016 Super Duty
1
Jun 1, 2016 04:23 PM
89broncoll
1999 - 2003 7.3L Power Stroke Diesel
26
Jul 11, 2011 05:05 AM
