Ford - Crownvictoria :: Puffing Sound Consistent With Engine Speed - Higher RPM?


Jul 2, 2012

2000 Crown Victoria, 207K miles, 111K on current engine

My car has been an absolute champ since I took ownership of her at 133K miles, and to this day runs trouble-free. However, it's just started making a noise that's got my scratching my head. I can only describe it as a "puff" sound. It's consistent with engine speed (higher RPM = faster puffs), and seems to get louder the more open the throttle is. If you let off the gas and coast, the noise goes away.

What's kinda confusing me is that the noise does not occur at all while the car is not in gear. If you park and rev the engine, the noise doesn't happen at all. All fluid levels and conditions are good, and there's been no loss of power or other issues from the engine or transmission.

My only guess is perhaps I have a teeny-tiny pinhole leak in my exhaust somewhere. The sound seems to be coming from somewhere very close to the engine, but since it doesn't happen when parked I can't pop the hood and look around for where exactly the sound might be coming from.

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Ford Super Duty (1999-2016) :: F250 5.4L - Engine Making Puffing Sound Out Of Exhaust

Here's a link to a video where you can hear what I'm describing. The noise is most noticeable around the start (first 18 seconds) and the end of the video when I'm closest to the exhaust pipe:

YouTube ....

You may need headphones to hear it, but the engine seems to be making a bit of a puffing sound during idle. It happens completely randomly and I'm not quite sure what could be causing it.

Aside from this noise, the engine seems to idle normally, and the check engine light isn't on. I had all of the injectors out a few weeks ago for cleaning. They all appear to be working fine. I also cleaned the throttle body at that same time and ensured there were no obstructions for the air intake and filter.

What might be causing this sound? 1999 Ford F250 Super Duty 5.4L

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Either that or the wheel is not seated completely. I'll call the guy back tomorrow when they open and let him know what I hear.

Only reason I didn't so it myself is because its cold out now and he did everything including alignment.

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I've attached a video... The sound can heard starting at 00:23 and becomes constant after a few seconds. Its hard to hear at first, but if you listen carefully its definitely there.

I have an appointment with the dealer tomorrow and will update with their findings. In the meantime, any clue as to what this could be? I can't really pinpoint where its coming from, seems loudest near where the oil filter is? By the way I'm 100% stock.

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The truck continues to shake after taking foot off gas and braking. It will shake harshly even when braking and slowed down to 5mph, but instantly goes away once at a complete stop. Accelerate immediately after coming to a complete stop and it completely goes away and drives normal for a day.

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