hello,

I have a 04 6.0L and I just noticed a lower thud sound coming from the driver side engine compartment. You can't hear it at all on the passenger side, but from the wheel well i can a slight "thud" "thud" sound from engine. what could this be? you can also hear it more from underneath the engine than the top.

Thanks,
Greg

 

Do you have your heat or ac on?

It could be your ac compressor cycling on and off.

 

ac and heat are off.

 

The sounds 'thuds' with the engine rpms, but it goes away after like 2k rpms

 

Exhaust leak maybe?

 

That's what I'm hoping for. .. I might have just noticed minor surging at idle.

 

The "thud" you hear is the door in the heater that directs the heat to the various places.(.defrost,floor,dashvents)..slamming shut upon startup because of lack of or increase of vacuum. .

I thought something was broken for a few months. It put my mind at ease finding this out.

Edit: OOPS, I didn't see it was reoccurring until I reread your posts. Maybe still be the door opening and slamming..possibly a vacuum leak is making the door open and shut repeatedly.

 

This thud sound is constant with rpms

 

Is it missing?, do you have an aftermarket intake?.

 

here's a youtube video of the sound. you can hear the "thudding" on the driver side. http://www.youtube.com/watch?feature...&v=J6ZNqKFqJz4

 

Can't listen to the sound your vidio is marked private

 

Just changed it to public.

 

Do you get any exhaust smell in the cab at all? Check for soot on the firewall around the up pipe and Y pipe and all around the manifold. Maybe the bellow on the up pipe is cracked.

Also check for intake leaks.

 

No exhaust smell in cab, but slight exhaust smell above engine on driver side. Thanks

 

The was told the thud sound was normal, and the P132B code turned out to be the MAF sensor, replaced it, has power back.