help w/strange noise problem

[marino]

This is why I think that this noise is much more involved than just a coolant cap or bottle. The coolant cap and bottle is just a system of a far greater problem.

[farmerx]

I put the carquest #33045 cap on today and no more noise. I am sure that it is just silencing the symptom (sp?) of a more serious problem a band-aid if you will. I will looking into fixing the egr cooler leak when the tech gets back into town.

[troll4rockfish]

well my truck has been quiet and not puking since I put the new cap on and that was with driving the truck very hard. So today I loaded my sct street tune back in and it started the flute noise with a little bit of puking under normal driving with temps under 20 degrees outside, after that I loaded the stock tune backin and drove the truck like I stole it, the results no noise and no puking.

for some reason my sct tune makes the flute noise and pukes when temps are below freezing [img]/ubbthreads/images/graemlins/confused.gif[/img] [img]/ubbthreads/images/graemlins/confused.gif[/img] maybe it advances the timing to much [img]/ubbthreads/images/graemlins/confused.gif[/img]

[marino]

Like I said, the new cap is not a fix, rather a temporary mask. If there is a build up of pressure in the coolant system to the point that it is causing the coolant to puke and the cap to sing, this a serious problem. The singing cap is merely a symptom of a much greater problem. Give it time and the cap will blow regardless of the setting you are on. I myself am leaning towards headgaskets on mine. The only reason you are hearing it when you have a tune loaded, is because of the higher cp. Wait till the cap is "broke in" and you will hear it the same as you did before the new de-gas cap.

[GruntTorque]

Mine was only whistling when pulling a heavy load (stock) and the tech that replaced my head gaskets said that one side was pretty badly blown. I don't think its just the cap or bottle either. I would think if it was a bad cap it would whislte to let off the pressure and then stop, rebuild pressure and repeat (if it really didnt have bad gaskets or egr cooler) if that makes sense [img]/ubbthreads/images/graemlins/shrug.gif[/img]

[601HP]

I've been hearing this same thing for 5 or 6 weeks now. It's puzzled the heck out of me until I read this thread just today!! [img]/ubbthreads/images/graemlins/crazy.gif[/img] It definitely sounds like a wine glass being softly 'rimmed' by a damp finger. The 'flute' description is fairly close also. I hear the sound during light acceleration, and just after I release the throttle.

Now I've got to look for indications of steam. I agree with someone else who stated the sound emitted from the cap is probably a symptom of the real problem, which is .....maybe the dreaded head gasket failure??? This doesn't sound good. [img]/ubbthreads/images/graemlins/confused.gif[/img] I'll keep reading and report back any more observations I find.

And check out this comment from someone in the know, Ford Doctor.

Member


Reged: 07/26/04
Posts: 1067
Loc: New Jersey Re: blown head gasket [Re: razzlejw]
#3201010 - 01/30/07 06:45 AM Edit Reply Quote Quick Reply




Quote:
--------------------------------------------------------------------------------

Question how do you determine if head gasket is blown?. I don't see any lost cooling but when it is cold outside I get an occasional squeak when I accelerate and let up gas pedal. I have an '04.


--------------------------------------------------------------------------------



To expand on what GregH stated, there are inspections and pressure tests to the cooling system that we use to help determine the source of exhaust gasses. Watching how pressure builds in the system and when, is a good indicator that leads us in the right direction.

Sometimes it is as easy as finding coolant in the intake manifold when removing the EGR valve or observing coolant dripping from the right side exhaust manifold. More intrusive inspections require removal of the EGR cooler for bench testing and of course, removing the cylinder heads to inspect the gaskets.

The squeaking noise you mentioned, if it's what I think it is, caused by the excess pressure in the cooling system bleeding out of the cooling system pressure cap. I have observed that when this symptom exists, it is indicative of a failed head gasket and only occurs after a heavy acceleration. You don't always necessarily have any coolant loss in this situation.

If you want to do a quick check on this, get the engine warmed up to full operating temperature and determine that you can duplicate the noise. Loosen the pressure cap enough to prevent it from sealing the system and try a few full throttle accelerations. If the noise goes away, you have then verified the source of the noise as pressure in the cooling system... then it;s off to your favorite technician for a more thorough diagnosis and repair.

--------------------



David

[beowulfs]

I had this probelm for about 2 weeks. i was going to compare it to a windmill creaking, but the tea kettle works. Replaced the ford cap with a cap from o'reilly. noise was gone. 3 days later, today, blew the head gasket and belched white anti-freeze smelling smoke. waiting on the wrecker now. after blowing, there was no pressure on the overflow cap. i promptly deprogrammed and put the ford cap back on. i would've taken it in earlier, but i couldn't get it to make the noise on the stock load.

specs:

04 F250 6.0L Diesel Auto with Torque**** Crew Cab FX4 Long Bed Lariat
MBRP 4" Turbo Back Cool Duals with Cat Delete
Superchips FlashPaq on Performance (did it on economy too)
Air Raid cold air intake.

[mrkleen]

same noise on mine replaced hgs and egr no more flute

[Selbeep]

I too have started suffering these same problems,

Back in December, I took the truck in to the dealer to have a problem diagnosed for "low temperature heat" from the heater with the engine at normal operating temperature. It was especially bad when the engine was brought down to an idle (almost like turning on a/c) even though engine coolant temperature remained normal. Dealer replaced engine thermostat??
I still have the "heat problem", but for the last 2 weeks, have been experiencing the "flute" noise (seems to be getting worse).
Today I noticed that I now have coolant being vented out from under the resevoir cap!

Truck goes back into dealer this week.

[fullthrottle800]

I think I have this noise now too it will do it with ever so slight increase on gas pedal or releasing accelerator as well.I have been idling my truck for 12 hours a day at work and I wonder if this could be related somehow.

[fullthrottle800]

Can replicate the squeal by putting in gear and reving to about 1100 rpm with foot on the brake.High pitched squeal bellows out of the engine bay quite loud and piercing noise.