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.

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post #1 of 4 (permalink) Old 09-08-2019, 03:20 PM Thread Starter
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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.
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post #2 of 4 (permalink) Old 09-08-2019, 06:17 PM
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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.


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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


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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.

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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.
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post #3 of 4 (permalink) Old 09-08-2019, 06:59 PM Thread Starter
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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.
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post #4 of 4 (permalink) Old Yesterday, 09:50 PM Thread Starter
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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
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