97 7.3 noise

[Fisheye's]

Well the fuel leak is fixed now I'm getting a whump whump whump noise coming out of the air cleaner, you can put your hand over the inlet and it is drawing in air nothing is blowing out. anyone have any suggestions as to what the problem might be?

[Fisheye's]

Anybody have any clues?????????

[jesilvas]

When does it make that noise?

[rolsmojave3]

I've heard a handful of diesel's doing it...one being our Cummins work truck. It still has power, been whumping for 50k miles now.

[Fisheye's]

Seems like it's doing it all thetime of course you can only hear it for sure when your sitting at an idle. With road noise and all I'm just guessing all the time. It started when I went to take off and the truck acted like it was missing I got on the freeway and it missed/shuddered periodically until I got up to hwy speed and hasn't missed since. I've driven it about 400 mi. and it accelerates and runs fine but the noise I hear sitting at a red light makes me a little nervous.

[AD5GB]

There are lots of things that can change the 'note' of the intake/exhaust sound. (Can you hear it in the exhaust as well?) Could be things like injector electrical issues like the UVCH, IDM etc. Injectors themselves or their o-rings. Could be mechanical issues like a bent push rod, valve/ring/piston failure. I'd start with a scan and cylinder contribution test to see if it is a weak cylinder. If one's found go from there. (buzz test, look into UVCH issues, compression test etc) I've heard engines of all sorts make that sound when a hole is weak. Good luck with it.

[rolsmojave3]

Our Cummins that does it will pass a cyl cont. test.