Loud noise

[FlyingLow]

I'm getting a loud noise coming from the right front area of the engine bay. The noise is only there when it is cold and only when accelerating. The only way I can describe it is a loud honing sound. The sound has gotten worse now that the dealer put on new oil cooler lines. Once the engine is warmed up, it goes away. Oil level is good and there seems to be no averse effect other then the noise. But when I hear the noise I start coasting and it goes away. Anybody got an idea?

 

[Azmotorhead]

A loud Honing sound:dontknow: :dontknow: . Kinda lost on that one.
Grating, Humming, Banging, Droning I can understand but not Honing.
More detail please

 

[RAM82A1]

Make sure there's no kinks in the lines they installed.

 

[Silverback]

Have you changed oil filters lately? That was an issue at one time.

 

[FlyingLow]

A loud Honing sound:dontknow: :dontknow: . Kinda lost on that one.
Grating, Humming, Banging, Droning I can understand but not Honing.
More detail please

Droning sound, loud.

Have you changed oil filters lately? That was an issue at one time.

No on the filter change. This has been happening for a while. It would only do it when it was really cold outside. Now it does it more often.

 

[SilvrSRT10]

Power steering pump???:dontknow:

 

[Blakewilder]

yup....power steering pump...

 

[FlyingLow]

I don't think it is the power steering pump. I have heard that and this is louder and you can feel the noise.

 

[JTS VENOM PERFORMANCE]

If it didnt happen until the dealer installed the cooler start there, they did something that changed things

Look at the lines, make sure they are not touching up against anything.

Also check you power steering pump and the lines, they could have moved the lines and now they are bound up on something.

I use to run into this alot, if you happen to leave a PS line, especially the mtal part up against another metal part, then you would get a moaning sound until it warmed up, then as the fluid got warmer it moved easier thru the lines and the noise would go away.

Look for any lines also hittingthe frame rail.

But if the noise didnt start till they worked on it, then focus on what they did.

 

[Texas Yellow Fever]

Get a piece of hose, garden hose or something similar. Hold one end to your ear, move the other end all around where the noise is, you can isolate it this way, when the open end passes over or near the problem you'll be able to hear it loud and clear. I know it sounds hoaky, but it works better than a mechanics' stethoscope and a whole lot cheaper.

 

[Black1]

Did this happen before, or after the "water-bottle" incident? :dontknow: Maybe something is loose up there... Like a wheel bearing or something?

 

[FlyingLow]

This has been happening for over a year. It only happens when it is cold and when driving, not idling. It just seems to have gotten worse since the new oil cooler lines have been installed. The noise also increase with RPM's.

 

[Big Perm]

Good luck with the diagnosis Scott.....no mechanical knowledge here, so just accept some friendly support

Hope you find it quickly and the fix is cheap....

 

[FlyingLow]

I still have the sound, but I may have found the cause. The line going to the cooling fan is leaking. So my theory is this: When the engine is cold the fan is not running. As the engine starts to warm up the fan comes on, but at reduced speed (hence reduce pressure). The reduce pressure combined with the leak is causing the sound. Now I'm not sure if this theory is correct. The part I don't understand is why I can feel the noise in the truck. I can feel the sound in the pedals, well really I can fell it everywhere. But once the truck is warmed up, the sound is no longer there. The noise/vibe is also proportional to the amount of pedal input. So at 25mph, no noise. I start to give it some gas and the noise is slight. More gas and the noise gets louder. If I reduce the throttle input, the noise reduces. If I come off the pedal completely, the noise goes away. This is happening regardless of MPH. Does the fan speed vary with RPM when the engine is not up to operating temp? That might explain why the noise varies with pedal input.

 

[SilvrSRT10]

I'm thinking it still has something to do with the power steering pump. The power steering pump is what supplies the hydraulic pressure that turns the fan. Maybe the leaking line is vibrating somehow and resonating from the pulses from the power steering pump. That would explain the variance with the engine RPM. Just a shot in the dark but it makes sense to me.

 

[Azmotorhead]

Just a side note PS pressure is not what controls the fan speed.
PS pump should be a constant pressure pump. Fan speed is controlled by the computer cycling the fan solenoid off and on at variable rates. Called Pulse width modulation.
If you feel it everywhere its being transmitted thru the frame.
Still not much help I know:dontknow:

 

[FlyingLow]

This morning when the sound started I put the truck in neutral and did some revs. The sound would increase with the RPM's. So I'm still trouble shooting. I wrote down my oil and water temps. I will continue to do this to see if I can detect a pattern.

 

[SilvrSRT10]

Could the leaking line be allowing air into the system and the pump is having to work it through causing the noise? Just another thought.

 

[azpyroguy]

Could the leaking line be allowing air into the system and the pump is having to work it through causing the noise? Just another thought.

Albeit not on my 10, but on my sand car I have power steering, and I managed to suck air into the system somehow which caused a temporary failure of power steering (when you have nearly 20 feet of power steering line getting air out sucks..) but while their was air in the system I was getting a droning/whining sound from the pump, which transmited into the frame, etc.. and once the air got purged the sound/noise went away... just a thought..

 

[FlyingLow]

Today the sound was not there, but I let the truck warm up a little more. I will keep watching the temps.

What temp does the fan come on and what temp is the fan on at full speed?