Sequential cabin vibrations

[jaruss01]

Anyone else notice this? When sitting in the vehicle in park with the engine on, every 3 seconds there is a light vibration for a couple seconds that comes through the seats. I thought I was imagining this but turned off the heat and the stereo and still felt it. It was an off and on rhythm that flowed through the seat. Like you count 1-2-3 and then felt what seemed like a phone stuck in between the seats vibrating.

from the engine I presume. And probably not an issue but figured I’d ask if others noticed too. I first started taking notice when my phone was on the dash and I started reaching into my pockets totally confused like someone was calling. Very perplexing.

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[Silver-Bolt]

Likely the alternator clutch engaging and disengaging.

 

[soupcook]

Anyone else notice this? When sitting in the vehicle in park with the engine on, every 3 seconds there is a light vibration for a couple seconds that comes through the seats. I thought I was imagining this but turned off the heat and the stereo and still felt it. It was an off and on rhythm that flowed through the seat. Like you count 1-2-3 and then felt what seemed like a phone stuck in between the seats vibrating.

from the engine I presume. And probably not an issue but figured I’d ask if others noticed too. I first started taking notice when my phone was on the dash and I started reaching into my pockets totally confused like someone was calling me, or there was a beeper from the 90s wedged in the seat gap. Very perplexing.

This may be out of left field, but my 2020 Ranger felt like that when I first purchased it...it was because of the Start/Stop function when the truck was stopped. Since the idle is so quiet and the traffic making noise, I couldn't hear the engine shut off or restart.

 

[AK SNO RIDER]

Is this a 2.3? My RS did this quite noticeably.

 

[jaruss01]

Is this a 2.3? My RS did this quite noticeably.

2.7. Did you have it fixed or was a normal and just a “thing”

 

[Vigor]

This may be out of left field, but my 2020 Ranger felt like that when I first purchased it...it was because of the Start/Stop function when the truck was stopped. Since the idle is so quiet and the traffic making noise, I couldn't hear the engine shut off or restart.

2.7. Did you have it fixed or was a normal and just a “thing”

See if it happens when you have auto start/stop off
My wife's suv does the same thing. It does a little wet-dog-fur-shake to wake itself up

 

[broadicustomworks]

A/C Clutch engaging, possibly.

In older engines without the CEL, knock and position sensors to tell you things were wonky, it was a sign of a misfire.
With today's engines if you had a misfire bad enough to feel it in a rhythmic fashion from the seat, your dash should be lit up like a Christmas tree.

 

[wetdog]

If you have defroster on it could be the compressor cycling off and on,or the farbulator solenoid for the dylithum crystal venturi.

 

[Bonnie6G]

I’ve had this in several vehicles - a Tahoe and an Armada. When idling, then engine just seems to rev on its own for a second or two. Pull up the RPM gauge on the screen and watch it when you feel the vibration. I never did figure out what caused it because it never became a big enough problem for me to bring it to the shop, but I agree with the comment above that if there was an issue like timing or something, your dash would be letting you know.

 

[AK SNO RIDER]

2.7. Did you have it fixed or was a normal and just a “thing”

It was normal, they all did it.

I've yet to spend more than a few minutes with a 2.7 to see if it's the same.

 

[joez]

My mustang does this, the engine is adjusting the air/fuel mix. I am not sure if the bronco has an air/fuel ratio gauge. Open this up and see if it is changing when you feel the vibrations.

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