Sporadic intermittent vibration at stand still - Diesel Forum - TheDieselStop.com
1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

 1Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 17 (permalink) Old 09-08-2019, 03:20 PM Thread Starter
Member
 
Forester121's Avatar
 
Join Date: Aug 2019
Posts: 83
My Photos: (0)
Feedback Score: 0 reviews
Sporadic intermittent vibration at stand still

I bought a early 99 7.3 f250 a couple weeks ago and I replaced my injector o rings, glow plugs, and serpentine belt as it was squeaking. There is currently a 50hp custom tune from the past owner. I had my issue even before I replaced these rings. It's hard to explain and only noticeable when the truck is not moving, in park or gear. I do believe that I have a very small exhaust leak towards the back of the engine that must be on the very start of the downpipe.

Onto my issue: When I'm idling at a stand still, there is a vibration that I can hear and feel while I'm in the cab. It doesn't come in any certain pattern. Sounds like "smooth... vibrate vibrate... smooth... vibrate.. smooth smooth... vibrate..."(etc.) Since I'm new to my powerstroke, this could be completely normal, I have no clue. The actual idle of the truck stays undisturbed. I do notice a very slight jump in the RMP's when the vibration occurs. When I'm driving and I coast while barely pressing the accelerator the truck will vibrate as well, but it's consistent and only at a certain depression of the pedal. This vibration is not loud or anything but noticeable for me and my friend to hear/feel.

I can't find a past forum on anyone with this specific issue, but I've read that it could be bad motor mounts, the exhaust touching the tranny cross member bolt (I don't think this would cause a RMP jump), a bad serpentine belt tensioner or alternator.

Are there any other ideas? Like I said, maybe this is normal for the 7.3's. I can try removing my custom tune to see if that solves anything if I can figure out how. Thanks in advance for the help.

Early 1999 F250 XLT 7.3l 4x4
252,000 miles and increasing
Forester121 is offline  
Sponsored Links
Advertisement
 
post #2 of 17 (permalink) Old 09-08-2019, 06:17 PM
Lifetime Supporting Member
 
ArcticDriver's Avatar
 
Join Date: Apr 2015
Location: Longmont, CO
Posts: 3,722
My Photos: (0)
Feedback Score: 0 reviews
It could be two separate issues.
Do you have the A/C on?
Does it happen even when the HVAC is turned off?
Even the windshield defroster engages the compressor so the dial needs to be OFF to test.

The reason I ask is to eliminate the possibility its the A/C compressor cycling.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 CC SB 7.3 PSD w/4R100. 182,000 miles.
NOS Black CPS. ScanGauge-II, AIC, Bilstein 5100, Stancor GPR, Marinco Mod, B&W Turnover Ball, Michelin Defender LTX


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 SC LB 7.3 PSD w/ZF-6. 177,000 miles.
NOS Black CPS. ScanGauge-II. Bilstein 5100. Stancor GPR. Walker BTM. Noco Mod. Michelin Defender LTX 285/75/16.

SOLD:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2000 F-250 4x4 SC SB 7.3 PSD w/4R100. 164,000 miles.
NOS Black CPS. Rebuilt Fuel bowl w/gold spring, 6.0 Cooler, Walker BTM, Stancor GPR, Michelin LTX M&S2.

Last edited by ArcticDriver; 09-08-2019 at 06:22 PM.
ArcticDriver is offline  
post #3 of 17 (permalink) Old 09-08-2019, 06:59 PM Thread Starter
Member
 
Forester121's Avatar
 
Join Date: Aug 2019
Posts: 83
My Photos: (0)
Feedback Score: 0 reviews
Yes it occurs with everything off. My ac compressor clutch won't even turn when I have the AC on so I figured I new a new compressor or a clutch plate. Secondly, I noticed it only vibrates when the truck is warm.
ArcticDriver likes this.

Early 1999 F250 XLT 7.3l 4x4
252,000 miles and increasing
Forester121 is offline  
Sponsored Links
Advertisement
 
post #4 of 17 (permalink) Old 09-21-2019, 09:50 PM Thread Starter
Member
 
Forester121's Avatar
 
Join Date: Aug 2019
Posts: 83
My Photos: (0)
Feedback Score: 0 reviews
Update- my issue is still happening, I replaced the ICP sensor which seemed to be worn since it was stock and has oil in the connector, and it didn't fix anything with this issue. It seems to be vibrating more often since I made this form post so it may be getting worse. I don't think it's the engine mounts because the engine doesn't move at all when idling. It's not the program on the truck because it occurs in stock mode as well. I'm wondering if maybe it's the alternator or a pulley? I thought I read up on it causing an issue similar to mine but I'm not sure if that could cause a slight jump in RPM'S. Does anyone have any ideas? I would really appreciate it. Josh

Early 1999 F250 XLT 7.3l 4x4
252,000 miles and increasing
Forester121 is offline  
post #5 of 17 (permalink) Old 09-22-2019, 06:11 AM
Lifetime Supporting Member
 
ArcticDriver's Avatar
 
Join Date: Apr 2015
Location: Longmont, CO
Posts: 3,722
My Photos: (0)
Feedback Score: 0 reviews
Josh,
It could be a pulley bearing but it seems like you would hear that.

You should also be able to feel a bad pulley by removing the serpentine belt and spinning each one by hand.

The tensioner is often replaced at the same time as the serpentine but I think I replaced mine around 150K miles. They do wear out.

Do you monitor EOT? Are you sure its not your cooling fan? That makes a pretty loud noise but would vibrate and affect RPM.

You have already ruled out A/C clutch.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 CC SB 7.3 PSD w/4R100. 182,000 miles.
NOS Black CPS. ScanGauge-II, AIC, Bilstein 5100, Stancor GPR, Marinco Mod, B&W Turnover Ball, Michelin Defender LTX


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 SC LB 7.3 PSD w/ZF-6. 177,000 miles.
NOS Black CPS. ScanGauge-II. Bilstein 5100. Stancor GPR. Walker BTM. Noco Mod. Michelin Defender LTX 285/75/16.

SOLD:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2000 F-250 4x4 SC SB 7.3 PSD w/4R100. 164,000 miles.
NOS Black CPS. Rebuilt Fuel bowl w/gold spring, 6.0 Cooler, Walker BTM, Stancor GPR, Michelin LTX M&S2.
ArcticDriver is offline  
post #6 of 17 (permalink) Old 09-22-2019, 01:55 PM Thread Starter
Member
 
Forester121's Avatar
 
Join Date: Aug 2019
Posts: 83
My Photos: (0)
Feedback Score: 0 reviews
I don't think I can hear it when I'm outside of the truck. I'll take off my serpentine belt and feel the pulleys again and the fan for play. I don't monitor and temps yet but gauges are on my list.

Early 1999 F250 XLT 7.3l 4x4
252,000 miles and increasing
Forester121 is offline  
post #7 of 17 (permalink) Old 09-22-2019, 02:35 PM
Lifetime Supporting Member
 
ArcticDriver's Avatar
 
Join Date: Apr 2015
Location: Longmont, CO
Posts: 3,722
My Photos: (0)
Feedback Score: 0 reviews
Get yourself a ScanGauge-2 for $140 or one of the Apps that bluetooths i to your OBD-II.

Both cheaper than gauges.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 CC SB 7.3 PSD w/4R100. 182,000 miles.
NOS Black CPS. ScanGauge-II, AIC, Bilstein 5100, Stancor GPR, Marinco Mod, B&W Turnover Ball, Michelin Defender LTX


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 SC LB 7.3 PSD w/ZF-6. 177,000 miles.
NOS Black CPS. ScanGauge-II. Bilstein 5100. Stancor GPR. Walker BTM. Noco Mod. Michelin Defender LTX 285/75/16.

SOLD:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2000 F-250 4x4 SC SB 7.3 PSD w/4R100. 164,000 miles.
NOS Black CPS. Rebuilt Fuel bowl w/gold spring, 6.0 Cooler, Walker BTM, Stancor GPR, Michelin LTX M&S2.
ArcticDriver is offline  
post #8 of 17 (permalink) Old 09-22-2019, 05:35 PM
Lifetime Supporting Member
Lifetime Supporting Member
 
Big Horn's Avatar
 
Join Date: Jul 2018
Location: Southern Illinois
Posts: 424
My Photos: (0)
Feedback Score: 0 reviews
See this add for Advanced Auto Parts! $139.99, then use the Promo Code for 20% off that, and get free shipping:


https://shop.advanceautoparts.com/p/...sg2/10206633-P

2002 F350 7.3L / 4R100 - 4WD CC DRW 8 Box, AIH Delete, Gauges- Pyro, Trans Temp, Boost, Fuel Pressure, TS-6 tuner, Zoodad Mod, Mishimoto 31 row Trans cooler, Mobil 1 ATF, Trans return line ATF filter, Hutch/Harpoon Mod, Air Lift Load Lifter 5000 rear air springs, Rancho 9000 shocks, Timbrens on the front.
Big Horn is offline  
post #9 of 17 (permalink) Old 09-22-2019, 07:28 PM Thread Starter
Member
 
Forester121's Avatar
 
Join Date: Aug 2019
Posts: 83
My Photos: (0)
Feedback Score: 0 reviews
Okay I'll get one of those, unfortunately I'll have to wait around 2 weeks until I get paid. I just cleaned my EBP tube and checked the pulleys, they all seem to be good, the only pulley that wouldn't spin easily was the power steering which I believe is not supposed to spin like the other pulleys in the first place. The PS pulley had a slight amount of play in an out (about 1mm). Thanks!!

Early 1999 F250 XLT 7.3l 4x4
252,000 miles and increasing
Forester121 is offline  
post #10 of 17 (permalink) Old 09-22-2019, 07:52 PM
Lifetime Supporting Member
 
ArcticDriver's Avatar
 
Join Date: Apr 2015
Location: Longmont, CO
Posts: 3,722
My Photos: (0)
Feedback Score: 0 reviews
The tensioner pulley felt smooth?

Since it might be getting worse, maybe it will become easier to diagnose.

Still thinking about how your old serpentine belt squeaked. I never had a serpentine squeak but did have pulley bearings that did. The old style individual v-belts used to squeak.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 CC SB 7.3 PSD w/4R100. 182,000 miles.
NOS Black CPS. ScanGauge-II, AIC, Bilstein 5100, Stancor GPR, Marinco Mod, B&W Turnover Ball, Michelin Defender LTX


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 SC LB 7.3 PSD w/ZF-6. 177,000 miles.
NOS Black CPS. ScanGauge-II. Bilstein 5100. Stancor GPR. Walker BTM. Noco Mod. Michelin Defender LTX 285/75/16.

SOLD:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2000 F-250 4x4 SC SB 7.3 PSD w/4R100. 164,000 miles.
NOS Black CPS. Rebuilt Fuel bowl w/gold spring, 6.0 Cooler, Walker BTM, Stancor GPR, Michelin LTX M&S2.

Last edited by ArcticDriver; 09-22-2019 at 07:57 PM.
ArcticDriver is offline  
post #11 of 17 (permalink) Old 09-22-2019, 08:32 PM Thread Starter
Member
 
Forester121's Avatar
 
Join Date: Aug 2019
Posts: 83
My Photos: (0)
Feedback Score: 0 reviews
Yes it felt smooth to me, I might just ignore it for now as it's not a very loud vibration and doesn't bother me much, I just wanted to possibly solve it if I could. I'll check the EOT among other temps once I get that scanner. Thanks for the help ArcticDriver

Early 1999 F250 XLT 7.3l 4x4
252,000 miles and increasing
Forester121 is offline  
post #12 of 17 (permalink) Old 10-11-2019, 07:37 PM Thread Starter
Member
 
Forester121's Avatar
 
Join Date: Aug 2019
Posts: 83
My Photos: (0)
Feedback Score: 0 reviews
Update- My problem persists but hasn't seemed to get any worse. AutoZone has a sale on the scangauge 2 for $110 right now so I could pick one up this coming Friday. Should I still plan on buying it?

Early 1999 F250 XLT 7.3l 4x4
252,000 miles and increasing
Forester121 is offline  
post #13 of 17 (permalink) Old 10-11-2019, 11:43 PM
Lifetime Supporting Member
 
ArcticDriver's Avatar
 
Join Date: Apr 2015
Location: Longmont, CO
Posts: 3,722
My Photos: (0)
Feedback Score: 0 reviews
I don’t know if it will help identify your issue but I think they are a good tool to have. I have one in each truck.

But I forget your model year. They may not be a big benefit in early 99 trucks and before.

There are also Bluetooth alternatives that guys are happy with but I will let them describe why they are good.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 CC SB 7.3 PSD w/4R100. 182,000 miles.
NOS Black CPS. ScanGauge-II, AIC, Bilstein 5100, Stancor GPR, Marinco Mod, B&W Turnover Ball, Michelin Defender LTX


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 SC LB 7.3 PSD w/ZF-6. 177,000 miles.
NOS Black CPS. ScanGauge-II. Bilstein 5100. Stancor GPR. Walker BTM. Noco Mod. Michelin Defender LTX 285/75/16.

SOLD:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2000 F-250 4x4 SC SB 7.3 PSD w/4R100. 164,000 miles.
NOS Black CPS. Rebuilt Fuel bowl w/gold spring, 6.0 Cooler, Walker BTM, Stancor GPR, Michelin LTX M&S2.
ArcticDriver is offline  
post #14 of 17 (permalink) Old 10-15-2019, 08:50 AM
Senior Member
 
Join Date: Apr 1999
Location: Justin,Texas, Republic of TEXAS (USA)
Posts: 5,278
My Photos: (1)
Feedback Score: 0 reviews
Let's talk vibration. Cylinder misfire or low cylinder contribution is a vibration at idle that you could count out loud like, "that, that, that, that", There is a resonance (fast vibration) from crank slowing on a compression stroke and crank acceleration from firing a cylinder. This lesser amplitude vibe is much faster, more like some electric vibrator they might use on muscles, etc. The resonance vibe is very sensitive to RPM and the PCM controlling idle speed and changing it 25 RPM might put it in and out of the sensible vibration range, especially if motor mounts are settled from aged rubber, exhaust is missing hangers or stressing hangers, and if it is a manual tras the wear of damping springs in clutch disc (you don't mention whether auto or manual trans).
If the vibe is occurring does it go away if you just barely raise engine speed by very light throttle pedal press?
SO what kind of vibration is it?

2015 F350 Platinum Max Tow What a beast with the 4.30 gears!
2006 F450 CC Hauler bed 4x2 6.0 L 6.0 auto, Lariat, 4.30 r/a, SCT, 4in exh. 103K New heads to repair diesel in coolant, 148K.
2006 F350 Lariat CC Dually 4X2, 6.0 auto 4.10 LS, SCT, airbags, 4 in. exh. 154K Rebuilt engine to repair damage from burned piston. One head to fix fuel in oil problem.
36 feet on the floor Elite/Outlaw LQ horse trailer.
35+5 foot double tandem axle flatbed trailer.
36 foot double tandem axle flatbed trailer
36 foot Platinum 6 horse LQ, side load, full width back tack
2003 EB Expedition 171K (no engine repairs, gas burners are the new longevity leaders)
2004 Volvo V70R AWD-high miler in fleet, 253K (no engine repairs) Hail totaled it but I kept it. Looks like a golf ball now.
Suzuki Carry KEI truck, 660cc 3 cyl DOHC EFI 4X4 5 speed RHD. Sort of a Smart Car sized pickup. Eats Gators and Mules for lunch.
jimmy is offline  
post #15 of 17 (permalink) Old 10-15-2019, 02:42 PM Thread Starter
Member
 
Forester121's Avatar
 
Join Date: Aug 2019
Posts: 83
My Photos: (0)
Feedback Score: 0 reviews
I checked the exhaust, it's not that, and it's an automatic. Yes, when I barely press the gas, it does away. It's a smooth sounding vibration, that is sporadic (random) and usually occured ever second or so but sometimes vibrates right after another vibration. The vibration usually lasts a half second to 1.5 seconds approximately. It doesn't seem to vibrate when the engine is cold. It does almost sound like someone is putting one of those sports vibrators on my frame to the point where I can barely feel it and hear it. It's definitely not harsh or theatening sounding. I hope this helps 😕 thanks!

Early 1999 F250 XLT 7.3l 4x4
252,000 miles and increasing
Forester121 is offline  
Sponsored Links
Advertisement
 
Reply

  Diesel Forum - TheDieselStop.com > 1999-2007 Ford Super Duties > 1999-2007 General Questions

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Diesel Forum - TheDieselStop.com 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











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 



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