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Screaming/Whistling noise under boost
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Author:  Kimio916 [ Mon Jul 16, 2012 11:54 am ]
Post subject:  Screaming/Whistling noise under boost

I just did the MAP sensor clean and installed Samcos (Huge split in one of the hoses). For one evening the CRD was running great! Huge power that I'd never known in the previous months of ownership, no smoke, no CEL/codes. The next morning, there was a distinct whistling/screaming noise on acceleration, right around the 1800-2k mark. We tightened down the hose clamps again, but that wasn't it. Ruled out belts too (the noise sort of sounds like a slipping fan belt does). We've isolated the noise to where the Wastegate body would be if these Jeeps had a wastegate. My Mechanic/buddy's guess is that the sudden (total) increase in boost from the hose replacement has caused either sudden failure in something or awakened some previously failing part. Please forgive the ambiguous language as I am a Noob, but I need help with this issue! Thanks!

Author:  geordi [ Mon Jul 16, 2012 1:32 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

Could be normal turbo noise?

Author:  Kimio916 [ Mon Jul 16, 2012 3:49 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

No. I had one evening of it running properly after the hose replacement/MAP cleaning so I know what the spooling is supposed to sound like. This is a screeching noise; very unpleasant.

Author:  galatron [ Mon Jul 16, 2012 4:44 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

You've got a leak somewhere, I know exactly what you're talking about, I had my elbow loose after reassymblying my topend rebuild, I thought my turbo had gone while it was in the garage, or a screw fell in there... got under the truck and saw a gap... all fixed.

look for a leak. your jeep sounds like a banshee I bet.

Author:  CATCRD [ Mon Jul 16, 2012 4:47 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

Kimio916 wrote:
I just did the MAP sensor clean and installed Samcos (Huge split in one of the hoses). For one evening the CRD was running great! Huge power that I'd never known in the previous months of ownership, no smoke, no CEL/codes. The next morning, there was a distinct whistling/screaming noise on acceleration, right around the 1800-2k mark. We tightened down the hose clamps again, but that wasn't it. Ruled out belts too (the noise sort of sounds like a slipping fan belt does). We've isolated the noise to where the Wastegate body would be if these Jeeps had a wastegate. My Mechanic/buddy's guess is that the sudden (total) increase in boost from the hose replacement has caused either sudden failure in something or awakened some previously failing part. Please forgive the ambiguous language as I am a Noob, but I need help with this issue! Thanks!


I bet it's the hose clamp at the turbo. I know you checked them for tightness, but it could be slightly out of position and causing a leak. It happened to me when I installed samcos and the special clamps they sell. The band of the clamp was too wide for the clamping surface on the turbo, so it would leak. I know the exact sound you mean. I went back to the stock clamp on the turbo outlet and the problem went away.

Author:  Kimio916 [ Mon Jul 16, 2012 5:08 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

galatron wrote:
You've got a leak somewhere, I know exactly what you're talking about, I had my elbow loose after reassymblying my topend rebuild, I thought my turbo had gone while it was in the garage, or a screw fell in there... got under the truck and saw a gap... all fixed.

look for a leak. your jeep sounds like a banshee I bet.


"Like a Banshee" is right on! I will check the hoses again.

Author:  Kimio916 [ Mon Jul 16, 2012 5:16 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

CATCRD wrote:
Kimio916 wrote:
I just did the MAP sensor clean and installed Samcos (Huge split in one of the hoses). For one evening the CRD was running great! Huge power that I'd never known in the previous months of ownership, no smoke, no CEL/codes. The next morning, there was a distinct whistling/screaming noise on acceleration, right around the 1800-2k mark. We tightened down the hose clamps again, but that wasn't it. Ruled out belts too (the noise sort of sounds like a slipping fan belt does). We've isolated the noise to where the Wastegate body would be if these Jeeps had a wastegate. My Mechanic/buddy's guess is that the sudden (total) increase in boost from the hose replacement has caused either sudden failure in something or awakened some previously failing part. Please forgive the ambiguous language as I am a Noob, but I need help with this issue! Thanks!


I bet it's the hose clamp at the turbo. I know you checked them for tightness, but it could be slightly out of position and causing a leak. It happened to me when I installed samcos and the special clamps they sell. The band of the clamp was too wide for the clamping surface on the turbo, so it would leak. I know the exact sound you mean. I went back to the stock clamp on the turbo outlet and the problem went away.


I'm using the stock clamps based on the responses to the aftermarket clamps on this forum, however I'm sure that could be it. I appreciate the advice and will definitely recheck all four contact points. Fingers crossed.

Author:  papaindigo [ Mon Jul 16, 2012 7:28 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

The Samco hoses are great but 1) they don't have witness marks like the factory hoses so you need to be careful when you put them on to wiggle/twist them around to make sure they are not rubbing on anything and 2) they can be a little finicky about going all the way on at each end so you need to be sure they are snugged all the way up to the "stop" before tightening the hose clamps particularly on the plastic intercooler mounts or the clamp may not be fully on/over the clamping surface.

On those clamps run them down snug, no godzilla, and drive for a few days and then recheck tightness. Once that's done you should be ok.

Author:  Kimio916 [ Mon Jul 16, 2012 9:22 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

papaindigo wrote:
The Samco hoses are great but 1) they don't have witness marks like the factory hoses so you need to be careful when you put them on to wiggle/twist them around to make sure they are not rubbing on anything and 2) they can be a little finicky about going all the way on at each end so you need to be sure they are snugged all the way up to the "stop" before tightening the hose clamps particularly on the plastic intercooler mounts or the clamp may not be fully on/over the clamping surface.

On those clamps run them down snug, no godzilla, and drive for a few days and then recheck tightness. Once that's done you should be ok.


I believe I just did all of this with no effect on the banshees, but I will rexamine. Thanks!

Author:  Kimio916 [ Tue Jul 17, 2012 9:33 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

All clamps and fittings for the Samcos have been checked, tightened, and rechecked. The Screeching noise is still there, and starting to drive me crazy. Can anyone help?

Author:  Topan [ Wed Jul 18, 2012 4:11 am ]
Post subject:  Re: Screaming/Whistling noise under boost

Have you taken out the SAMco to examine the inside ?
Maybe a defect where the plastic stips of the hose is broken inside.
My SAMCOs were full of little splits after just a few 100 miles of usage (back to 2nd gen of stock hose now).

Author:  Hoosier CRD [ Wed Jul 18, 2012 5:59 am ]
Post subject:  Re: Screaming/Whistling noise under boost

On other vehicles, I have had a fan clutch squeal pretty badly while the engine was under load. Have you also checked, replaced the serpentine belt? The tensioner pulley and idler pulleys?

The only other thing that I can think of would be the boost solenoid on the right fenderwell. Hope this helps.

FWIW,

Hoosier CRD

Author:  Kimio916 [ Wed Jul 18, 2012 1:39 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

Hoosier CRD wrote:
On other vehicles, I have had a fan clutch squeal pretty badly while the engine was under load. Have you also checked, replaced the serpentine belt? The tensioner pulley and idler pulleys?

The only other thing that I can think of would be the boost solenoid on the right fenderwell. Hope this helps.

FWIW,

Hoosier CRD


Fan Clutch and Serpentine Belt both replaced last week. Pulleys were inspected at that time, but I will take another look. Is it possible that the wastegate isn't opening fully? It definitely sounds like a pressurized air issue, whether it is a leak or? What about a failed gasket between the actual turbo and the elbow that the Samco clamps to on that side?

Author:  Hoosier CRD [ Wed Jul 18, 2012 4:17 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

Kimio916 wrote:
Hoosier CRD wrote:
On other vehicles, I have had a fan clutch squeal pretty badly while the engine was under load. Have you also checked, replaced the serpentine belt? The tensioner pulley and idler pulleys?

The only other thing that I can think of would be the boost solenoid on the right fenderwell. Hope this helps.

FWIW,

Hoosier CRD


Fan Clutch and Serpentine Belt both replaced last week. Pulleys were inspected at that time, but I will take another look. Is it possible that the wastegate isn't opening fully? It definitely sounds like a pressurized air issue, whether it is a leak or? What about a failed gasket between the actual turbo and the elbow that the Samco clamps to on that side?


Actaully there is no wastegate. There are veins that move inside the turbine housing though. The veins would not squeal but the actuator diaphragm (in the round housing that sits straight up on the turbo) may if it has developed a problem. I don't think that they are available seperately from the turbo.

The Samco hose clamps onto the compressor housing outlet of the turbo. That housing is held onto the center section of the turbo with bolts. You may put a wrench on one that you can get to and see if it is snug. It's unlikely that there is a problem there as you would not be building boost/making any kind of power if that housing is loose.

Kinda leads me to believe that you have a boost solenoid issue or the vacuum lines that are surrounding that solenoid.

BTW, where are you located?

Hoosier CRD

Author:  galatron [ Wed Jul 18, 2012 4:30 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

hmm, could be the egr valve or cooler, check the pipes that go to those components...
COLD engine, start engine, take paper and see if it whips around down there,,, or use your hand,,, it's not that dangerous. you definitely have an air leak somewhere.

Author:  Kimio916 [ Wed Jul 18, 2012 4:42 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

Hoosier CRD wrote:
Kimio916 wrote:
Hoosier CRD wrote:
On other vehicles, I have had a fan clutch squeal pretty badly while the engine was under load. Have you also checked, replaced the serpentine belt? The tensioner pulley and idler pulleys?

The only other thing that I can think of would be the boost solenoid on the right fenderwell. Hope this helps.

FWIW,

Hoosier CRD


Fan Clutch and Serpentine Belt both replaced last week. Pulleys were inspected at that time, but I will take another look. Is it possible that the wastegate isn't opening fully? It definitely sounds like a pressurized air issue, whether it is a leak or? What about a failed gasket between the actual turbo and the elbow that the Samco clamps to on that side?


Actaully there is no wastegate. There are veins that move inside the turbine housing though. The veins would not squeal but the actuator diaphragm (in the round housing that sits straight up on the turbo) may if it has developed a problem. I don't think that they are available seperately from the turbo.

The Samco hose clamps onto the compressor housing outlet of the turbo. That housing is held onto the center section of the turbo with bolts. You may put a wrench on one that you can get to and see if it is snug. It's unlikely that there is a problem there as you would not be building boost/making any kind of power if that housing is loose.

Kinda leads me to believe that you have a boost solenoid issue or the vacuum lines that are surrounding that solenoid.

BTW, where are you located?

Hoosier CRD


Sacramento, CA. I'm fortunate to have a master diesel mechanic as one of my closest friends, unfortunately there aren't many other CRDs around for reference. Kind of shooting in the dark here. Any and all help appreciated.

Author:  Kimio916 [ Wed Jul 18, 2012 8:01 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

Hoosier CRD wrote:
Kimio916 wrote:
Hoosier CRD wrote:
On other vehicles, I have had a fan clutch squeal pretty badly while the engine was under load. Have you also checked, replaced the serpentine belt? The tensioner pulley and idler pulleys?

The only other thing that I can think of would be the boost solenoid on the right fenderwell. Hope this helps.

FWIW,

Hoosier CRD


Fan Clutch and Serpentine Belt both replaced last week. Pulleys were inspected at that time, but I will take another look. Is it possible that the wastegate isn't opening fully? It definitely sounds like a pressurized air issue, whether it is a leak or? What about a failed gasket between the actual turbo and the elbow that the Samco clamps to on that side?


Actaully there is no wastegate. There are veins that move inside the turbine housing though. The veins would not squeal but the actuator diaphragm (in the round housing that sits straight up on the turbo) may if it has developed a problem. I don't think that they are available seperately from the turbo.

The Samco hose clamps onto the compressor housing outlet of the turbo. That housing is held onto the center section of the turbo with bolts. You may put a wrench on one that you can get to and see if it is snug. It's unlikely that there is a problem there as you would not be building boost/making any kind of power if that housing is loose.

Kinda leads me to believe that you have a boost solenoid issue or the vacuum lines that are surrounding that solenoid.

BTW, where are you located?

Hoosier CRD


Pulling one of the vacuum lines from what I believe is the boost solenoid seems to have eliminated the noise. Anyone know what this means?

Author:  GreenDieselEngineering [ Wed Jul 18, 2012 9:48 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

plug vac hose back into evm (was it the one with blue rubber isolator?). Run engine at idle in park, pull vac line off top of turbo-the control arm below actuator should drop about 1/2 inch or slightly more and then raise back up when vac line plugged in. If not, one of the EVMs is not working correctly. The blue one can be very noisy when it is going bad.

Author:  Kimio916 [ Wed Jul 18, 2012 11:35 pm ]
Post subject:  Re: Screaming/Whistling noise under boost

GreenDieselEngineering wrote:
plug vac hose back into evm (was it the one with blue rubber isolator?). Run engine at idle in park, pull vac line off top of turbo-the control arm below actuator should drop about 1/2 inch or slightly more and then raise back up when vac line plugged in. If not, one of the EVMs is not working correctly. The blue one can be very noisy when it is going bad.


Thanks Keith! Any idea what the parts cost?

Author:  papaindigo [ Thu Jul 19, 2012 8:47 am ]
Post subject:  Re: Screaming/Whistling noise under boost

If by evm Keith means 52109543AA looks like about $65+tx or shipping.

If that means more of the assembly I don't have a clue as to price but I do have a low mileage (45K) entire assembly (the black tower looking thing that controls the turbo variable vanes) with all the hoses that's left over from installing the GDE Stage II turbo that I'd be willing to part with. Email if interested and we can figure out a reasonable price + shipping to where ever you are located.

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