Loud wailing noise when hot after injector swap

[coRoveRhd]

MP3 of sound added below.

Did an injector replacement on a 2010 engine, mileage unknown. Immediately after injector swap, when engine gets to temp, a high pitched whir/siren is noticeable. The pitch changes slightly between 1000-2000 rpm but I can't hear it change much beyond that. At engine shut down, it's a VERY loud and noticeable siren/wail sound that persists until the all components have stopped spinning completely. It seem louder after engine shutdown. Sound is worst when engine at full temp. No sound when engine is cold. No codes, vibration, or anything funky. It drives like normal. I did bleed the PS pump after the swap caue the reservoir fell over, but the sound persists with serpentine belt off, so I don't think it's PS pump or anything on the belt. Sounds like sound is driver's side, low.

What I've done:
1. Bled PS pump.
2. Removed serpentine belt and and fan and ran engine. Sound seems to be coming from inside engine/trans or below.
3. Used mechanic's stethoscope and listened to timing chains and other parts of engine but don't notice it there.

Very odd that it would start immediately after injector swap, def was NOT doing it prior. I did have to unscrew engine/trans underside protection to retrieve a dropped bolt during swap. Next I will get under the truck when it's running to try to find something on underside.

Any ideas?

 

[Jimmy Brooks]

Did an injector replacement on a 2010 engine, mileage unknown. Immediately after injector swap, when engine gets to temp, a high pitched whir/siren is noticeable. The pitch changes slightly between 1000-2000 rpm but I can't hear it change much beyond that. At engine shut down, it's a VERY loud and noticeable siren/wail sound that persists until the all components have stopped spinning completely. It seem louder after engine shutdown. Sound is worst when engine at full temp. No sound when engine is cold. No codes, vibration, or anything funky. It drives like normal. I did bleed the PS pump after the swap caue the reservoir fell over, but the sound persists with serpentine belt off, so I don't think it's PS pump or anything on the belt. Sounds like sound is driver's side, low.

What I've done:
1. Bled PS pump.
2. Removed serpentine belt and and fan and ran engine. Sound seems to be coming from inside engine/trans or below.
3. Used mechanic's stethoscope and listened to timing chains and other parts of engine but don't notice it there.

Very odd that it would start immediately after injector swap, def was NOT doing it prior. I did have to unscrew engine/trans underside protection to retrieve a dropped bolt during swap. Next I will get under the truck when it's running to try to find something on underside.

Any ideas?

Where do you hear the whine? If it’s on the passenger side toward the back of the engine it could be PCV valves. When my PCV valves went bad it would make a squeaking noise right after I shut it off. Take a video of the noise.

 

[Rover Range]

Sounds like a vacuum leak to the brake booster.
Check the plastic hoses from the engine vacuum pump to the brake booster.

 

[coRoveRhd]

I will check hoses for leaks. I definitely disconnected the brake vacuum booster hoses to do the work, but they are also definitely re-connected.
Funny enough, I also put on new PCV caps as part of the work, but they are Amazon brand not OEM so perhaps they are faulty. Thanks for the responses, but I still think this is rotational not vacuum.

 

[coRoveRhd]

Here's a sound clip.

https://soundcloud.com/long-dust5967%2Flr4-wailing-sound

@Jimmy Brooks @Rover Range

Smoke tested all vacuum connections, intake manifold, and pcv.

Thanks for the help!

 

[LR4 2011]

The pvc diaphragm has a leak, the rubber probably got twisted of kinked. I replaced mine and I had the exact same noise. I removed them (careful with the tabs when lifting up) and greased the rubber with silicone to prevent the twisting and kinking.