M923A2 making a strange loud noise

[maxxplanck]

Hi guys , sorry for just dropping this in your lap. But I have my M923A2 in a parade for Veterans Day. Not the ideal place to start tearing it apart, so I need a little help. Never had this problem before but all of a sudden while driving it starting makeing very loud noise like a horn going off while I was increasing speed. As i took my foot off the excelerator the noise stopped but as I excerated again it came back. Very loud like a horn, even seen to be coming from behind me, not sure. Is this maybe my airfilter is not seated right ? Any help would be great , when the truck is in park with the engine running I give it some gas and no noise. Thanks Guys

 

[cbrTodd]

It could be a boost leak. It won't build enough boost revving it out of gear in order to show up. Check the rubber hose of the cross over tube after the turbo, and make sure the clamps are tight.

 

[simp5782]

It sounds like a loud whistle or a loud screech most of the time. Loosen all your clamps and inspect for boot tears under the clamp and in the middle of the boots then re tighten them.

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