Consistent hollow hitting noise behind firewall/floorboard...... - Ford Powerstroke Diesel Forum

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post #1 of 8 Old 10-25-2013, 04:40 PM Thread Starter
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Consistent hollow hitting noise behind firewall/floorboard......

Hello everyone, first sorry for the vague description in the title it is just hard to describe. So first I have an 08 F350 6.4 and when I sit at idle maybe every 30 seconds or longer I hear this hollow noise, almost like someone taking a small mallet and hitting under the floorboard near the passenger side or the bottom of the fire wall. Almost like a valve that is maxing out for a split second. So the only thing I have noticed on my SCT Livewire is that the exhaust back pressure will go from 119 in. hg to about 121 for a split second when I hear the noise and then it immediately recovers.

So, any help, ideas or insight will be greatly appreciated!

BTW, no trouble codes.

Thank you!
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post #2 of 8 Old 10-25-2013, 10:05 PM
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Ac compressor?

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post #3 of 8 Old 10-26-2013, 04:33 AM Thread Starter
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Thanks great idea but I turned off the HVAC and it still does it, unless it runs all the time maybe??
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post #4 of 8 Old 10-27-2013, 05:21 PM Thread Starter
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Okay well I am prepared to eat my words, I actually went back and tried again and apparently yes, it seems that when the HVAC is OFF I am not hearing the noise...hmmm, so do you think the ac clutch is going bad or any ideas??
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post #5 of 8 Old 12-05-2013, 10:11 PM
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My truck does this all the time when I have the heat or ac on.. Nothing to worry about. Just the AC compressor kicking in
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post #6 of 8 Old 12-16-2013, 11:21 AM
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There's an updated A/C accumulator for this concern, for early build trucks.

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2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
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post #7 of 8 Old 12-28-2013, 07:27 PM
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my 08 job 1 does this too when the hvac is on, i have been told it is a pain to fix so i just turn the radio volume up a little when the hvac is on


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post #8 of 8 Old 01-01-2014, 11:03 AM
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Quote:
Originally Posted by Big Angry Hillbilly View Post
There's an updated A/C accumulator for this concern, for early build trucks.
Is it worth fixing?

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