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Discussion Starter #1
This has plagued me for many years and I have finally had it.... Mostly during hot weather (90 degree+) and at speeds under 50 mph I can occasionally will hear something spooling or reving up like a jet engine (thats the best way to describe it). When the noise occurs I see no increase in RPM or boost and it throws no codes. I have had it over to my local dealership and they were worthless.... They can troubleshoot without a code. What ever happen to real mechanics!!!! Sorry back on subject..... What else could cause the noise that sound like a jet engine under my hood. My co-work is thinking it may be the fan, which is possible but I'm not sure how to test. And if it's not the fan what else could it be???? I did just pickup a OBD2 data logger and hope to connect it this weekend to see if it will provide me ant insite. Thanks in advance for any suggestion you may have.

Sorry the truck is a 2009 with the 6.4
 

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MY 7.3 sounds just like you describe when the fan kicks in. So my guess is that is what it is.
DENNY
 

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Its the cooling fan increasing in speed. you may also hear the same sound for a short period when you start away first thing in the morning as the PCM performs a self test on the fan
 

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Boy that would be way too easy to explain. Whatever happened to real truck owners!!!
 

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Discussion Starter #5
So, if its the fan clutch making the noise, have you guys replaced the clutch to resolve the noise?
 

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It is not the clutch just normal fan noise. Go to a small airport most of the noise you hear when a plane takes off is that big fan up front not the engine.
DENNY
 

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The fan clutch is electrically controlled. When the air conditioner, trans, or engine needs it then engine control module controls it for higher speed. Fan noise is good. It means you or the powertrain is getting cooled down better because of that noise. Listen when trucks take off at an intersection. You will often hear the truck go off with low noise and then all of sudden it jet engine noise time. Med and heavy duty trucks often use air controlled fan clutch and they get big time noisey when they kick in and some times it even kicks up a short dust storm
 
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