The search for the engine squeal continues...

2017 Tacoma SR 4x4 with 121,xxx miles. I noticed a squeal from the motor, once it was warm, and brought it to the dealership to utilize my extended warranty. Under warranty the idler pulley and serpentine belt were replaced. The squeal continues.

I'm posting a video in an attempt to capture it for diagnosis. If you have time I'd appreciate a listen. There's driveline noise which I'm not concerned with, it's the high pitched squeaking I'm trying to locate. I was thinking it was another pulley, but could some type of vacuum leak cause this? Once again it only seems to happen when the motor is warm.

https://youtube.com/shorts/Fq4zCEDkfQs?si=fG4SLpB-Pl56NWPk

 

Sounds like the high pressure fuel pump.
Hard to tell from the video, but is the chirping or peep sound more prominent on the passenger side?

 

It does seem to be louder on the passenger side, yes.

I would've never thought of the high pressure fuel pump.

 

That’s almost guaranteed the HPFP.

 

Thank you guys. What’s replacement look like of the HPFP? I’m currently visiting Orange Beach, AL.

 

Did you ever locate the issue?

 

I know I am late to the initial discussion, but here is a link to the fuel pump recall. 2016-2022 Tacomas are covered for 10 years regardless of mileage.

https://static.nhtsa.gov/odi/tsbs/2023/MC-10236191-9999.pdf

 

I sure did. It was the high pressure fuel pump.

 

Did you replace it or end up switching to ethanol free fuel or just living with it? Mine started to chirp bad and I fixed that with ethanol free.

 

I had it replaced under the extended warranty I purchased when I bought the vehicle.

After they replaced ALL the pulleys I brought it back, with the same squeal, and let them know my stethoscope had told me it was coming from the HPFP. They utilized theirs and decided it was, in fact, the HPFP.