Ecoboost pulsating sound at idle

[Nikujaga]

My 2024 ecoboost has a DISTANT pulsating/throbbing sound only at idle, if you barely increase revs it goes away. This happens in all gear sbut more noticeable in D. I have been told by one dealer it is the high pressure fuel pump (normal noise), another dealer went hunting for the sound, put the car on a lift with someone sitting in it, in D, and idling. I was under the car with the service mgr and could not hear it. Does anyone else's car make this sound?

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[APmech]

It may be your a/c compressor putting a load on it at idle. Turn off your a/c and see if it goes away. My 25 does this as well.

 

[Will2]

Does it sound almost like an engine rattle? Like a chuckachuckachucka sound?

I had that on a '25 Eco when lugging at low RPM, and my '26 GT does it too. Both my '24 Eco and '25 GT did not do this. But since it's present on both an Eco and GT, I suspect it's just how Ford builds them now, something changed. I went down the rabbit hole of wondering if it was my serpentine belt, timing chain issue, A/C compressor (sounded a lot like the Youtube videos I found on those), and eventually gave up. I once heard it when my '26 GT was off, so pretty sure it's something electronic/solenoid-related

 

[Nikujaga]

Thanks for replying. It does not sound like a rattle. It is a low amplitude...a low heavy throb/pulse sound, low in frequency and in the background, you have to listen carefully to hear it. I had a 2018 EcoBoost that dead quiet. For 2024 Ford deleted the resonator, so now the S650 eco has little burble....I don't like this. The S550 had a resonator, the exhaust was smooth.

 

[2024_Night_Mare]

Did you ever go into your car with Forscan and disable ESE? Could it possibly be that? Maybe pull the fuse for the radio and see if it goes away if you haven't disabled ESE.

 

[Nikujaga]

Did you ever go into your car with Forscan and disable ESE? Could it possibly be that? Maybe pull the fuse for the radio and see if it goes away if you haven't disabled ESE.

I don't have the technical expertise to go into Forscan, however I have thought about piped noise by the audio system but don't think it is culprit. At idle, if you barely touch the gas the sound goes away. In R or N the sound is much diminished. It is a mystery.

 

[Alan Applegate]

The only time my '24 Eco-Boost does this is when it's in closed loop. Once the engine warms up, it goes away.

 

[Nikujaga]

I don't have the technical expertise to go into Forscan, however I have thought about piped noise by the audio system but don't think it is culprit. At idle, if you barely touch the gas the sound goes away. In R or N the sound is much diminished. It is a mystery.

Does it sound almost like an engine rattle? Like a chuckachuckachucka sound?

I had that on a '25 Eco when lugging at low RPM, and my '26 GT does it too. Both my '24 Eco and '25 GT did not do this. But since it's present on both an Eco and GT, I suspect it's just how Ford builds them now, something changed. I went down the rabbit hole of wondering if it was my serpentine belt, timing chain issue, A/C compressor (sounded a lot like the Youtube videos I found on those), and eventually gave up. I once heard it when my '26 GT was off, so pretty sure it's something electronic/solenoid-related

The only time my '24 Eco-Boost does this is when it's in closed loop. Once the engine warms up, it goes away.

Thanks for replying. What do you mean by closed loop?

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