Okay guys i need some help with this. When my engine is up to temp, and when im sitting still idling, the truck makes a bad vibration that you can hear very audibly, and even feel through the floorboards, and through the seat sometimes. I can mask the vibration by sitting still at the light and moving the steering wheel one way or the other and it will go away (putting pressure on the steering system, or lowering engine RPM), or keeping the engine above idle. I can put the truck in neutral, and in park, reverse, whatever, it still does this. It goes away when i kick it to high idle. So the fact that it isnt a moving vibration, it isnt driveline, it isnt transmission, so it's got to be engine, right? It did this when i had the lift on, but now its off and back to stock, and its torqued up, and still does it.

Is this an excuse to get a Fluidampr?

 

Kris before I replaced my PS pump last weekend I had a rythmic vibration that came through the floorpan and brake pedal that was getting worse. When I put pressure on the pump (Turn wheel and press brake it would go away)

 

Ok thanks. Ill get it up to temp and then (shut it off ) and remove the serpentine belt. Thanks for the idea.

 

Now if you really want we can always turn it into an excuse for the fluidampr.

You see if you replace the PS pump the rotaional friction reduction of the new pump could cause a linear imbalance in the serp belt as it passes over the OEM damper and could stretch the belt an angstrom or 2.


^^^^^^^
Needed 2 shovels for that one

 

Kris did replacing the power steering pump resolve the idle vibration symptom the engine was having?

My 02 is exhibiting near identical symptoms.

 

Thanks for bringing this up. Actually i just learned to deal with the problem and i dont notice it much, however i never checked, because i forgot. Now i have some incentive to check.

 

Kris, without doubt, you need a Fluidampr.








Not that it would fix your problem, but you still need one.

 

Alright guys, I have been chasing this exact problem for the whole winter. It started out as a vibration/flucuation sound. It has progressed into a rythmic vibration. It only happens at idle. The tach is steady as a rock. It's driving me nuts.

Numerous people have experienced the same issue but no one has solved it.
I have ruled out the following:
IPR
HPX
ICP
Hutch/Harpoon
DI Tuner


I'm glad others are having the same issue. Lets solve this thing.

 

I performed most of the basic work yesterday on the truck and mind you the 2002 only has 66k miles on it,I think it has more engine hours than miles!

New CPS(black tip)(starts abit better)
New Idler pulley
New Gatorback serpentine belt(needed it)
New Power steering pump(helped maybe a little)
Changed trans fluid and filter(was about 30k old)

This vibration,groan or whatever you call it has been noticeable I'd say in the past few weeks. Driving me crazy as I spent all easter Sunday working on the truck.

What about the belt tensioner? would that be able to generate this type of vibration heard and felt in the cab?
I'm kinda wondering about the torque converter as the wife thinks she's in the Mustang haulin tail light to light but the vehicle is an 8k lb truck,closest reputable trans builder for Powerstroke 4R100's I know of is about 2 hours away in Shreveport.

When the TC starts going doesn't it typically start tossing marbles around before boom?

My Blackstone sample from Feb 2008 came back clean with no signs of main bearings being suspect.

The stock HPOP would that be a prime suspect for the vibration? If so I have a Pulse HPOP on order already.

 

Has anyone tried removing the belt and then checking for this vibration? If the vibration is still there you can eliminate the belt, pulleys and anything driven by the belt. If the vibration is gone it's source is one of these things.

 

Just got off the phone with Brian and he recommended the same thing plus remove the transmission inspection plate to check the flex plate for the balancing weight's placement,if it's secure that's good,also to watch for any cracks on the flexplate. Anything that drops out is also a sign of a part loose.

 

I had my transmission replaced witha tranny from Diesel Innovations last December. The issue was unchanged by the tranny swap. I feel confident we can rule out the tranny as the cause.

 

I removed the serpentine belt and voila! the vibration is totally gone!

This leaves us with the fan clutch/fan and/or the belt tensioner. Now has either been known to cause vibration that would radiate back into the cab of the truck? Both physically seem to be operationally fine.

The waterpump spins freely with no unusual sound or movement.

 

Interesting! I have noticed a squeaky pulley upon start up if I let the truck sit for a few days without running. The squeak disappears quickly after starting up. It only happens when the truck has sat with out running for a day or two.

I was attributing the squeak to a rusty compressor pulley but maybe I have another issue.

 

Check your tensioner pulleys for wear. I had the same problem last year and it finally turned into a squeeling. one of the bearings on one of the pulleys had finally let go. $80 for a Gates tensioner at Orielleys, and 10 minutes work and your done.