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Stupid dpf question


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I looked at a 2009 yesterday, and when it was idling, i noticed a whooshing noise on the passenger side when walking around the truck while it was idling.


Not quite a whistling noise.


Is this the case for all dpf trucks? I am used to driving old junk before the 7th injector was used.


Does this bode ill for the longevity of the filter? 450k or so on the clock, 15k hours.

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Mine makes a similar noise as it's warming up.


If you want to test for sure, shut off the truck and bleed out all the air using the foot brake pedal. Restart the truck and once the air pressure comes back up to around 80 psi you'll hear the exhaust brake come on (it's air activated). it'll come on at the same time the fan clutch turns off (it's also run from air).


You should hear the noise start once the the exhaust brake engages.

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Thanks, those are good answers.


It was a Mack, so I understand that to be the same engine. Mostly.


I actually heard the engine take load right after starting, so i bet that was the exhaust brake, Jeffw.


And thats a great chart for maintenance schedules, MrSeas.

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