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  #1  
Old 12-04-2012, 05:18 PM
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Strange Whistle noise

For the past 6 months I've been getting this high pitched whistle coming from the engine bay when I accelerate, usually while driving normal speeds (35-45). But lately its happening more, seems like every time I press the pedal it happens, and if I let off the pedal it stops right away, if I continue through the acceleration process, then it lasts about 4-5 secs. My thought it is coming from the turbos, whether it is a problem or not, I havent got a clue.
Any help is greatly appreciated.
Thanks.

James.
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Old 12-04-2012, 07:06 PM
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Could be the degas cap on the coolant tank. Black cap on the clear tank. Drivers side firewall. Check for residue on the outside of the cap. If it loses the ability to hold pressure, it can push air and coolant out the cap and cause a whistle. Sounds like a tea kettle under acceleration under heavy boost.
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Old 12-05-2012, 07:25 AM
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Check for soot on the firewall. Sounds like it could be a leaking up pipe.
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Old 12-05-2012, 06:03 PM
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Quote:
Originally Posted by 04hdfatboy View Post
Check for soot on the firewall. Sounds like it could be a leaking up pipe.
Where along the firewall, from above or below? And which side?

Also I don't think its the coolant tank, because its at its normal fill line. And there isn't any trace of coolant anywhere on the engine.

James.
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Old 12-06-2012, 06:00 AM
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Quote:
Originally Posted by BigGreen06 View Post
Where along the firewall, from above or below? And which side?

Also I don't think its the coolant tank, because its at its normal fill line. And there isn't any trace of coolant anywhere on the engine.

James.
It could be either side but usually they blow out around the bellow or where they turn up from the exhaust manifold.
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Old 12-06-2012, 06:04 AM
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Could be a boost leak in the I/C system too like a bad/loose boot or cracked pipe. Your I/C itself could have a hole in it. Wife's Dmax had the exact same symptoms so I built a boost pressure tester to find it. Was a hole in the I/C hot side pipe.
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Old 12-06-2012, 09:17 AM
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I read an article I'm the latest Diesel Power about the stock boots for the intercooler and turbo not being able to take the heat and failing quicker than they should. So already planning on getting them upgraded. Thanks for your input.
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Old 12-07-2012, 12:40 PM
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I got under truck yesterday while it was on the lift getting oil change, from what I could see, which wasn't much, there really isnt a lot of room under there, I haven't got a clue how you guys have fit your hands up there. But the left side looked good, the rightside though had a rubber boot on it that looked a bit degraded.

James.
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