2012 Knock/Chirp on cold start

[BrandonSVT]

@Canuck714 I haven't had the issue at all for at least the past two months. Not sure if it is the vct camp phasers or what. I watched a video and they actually have a little filter in them that maybe has some debris in it causing insufficient flow until the oil gets warm and flows better? It could also be the weather being warmer as well since this starting in March when it was in the 30's here at night.

Either way, the trucks running great so I am going to keep driving her.

 

[raptorusmaximus]

Urrg... I was hoping you would of found something.... mine started making the same noise and I can't seem to find the cause. This was the only post of the exact noise. It's very hard to trace as it only does it at cold start... starts making the noise about 5 seconds after start then stops after about 30 seconds.

 

[TAC71]

My truck had a chirp /squeak just cold start and would only last 10 to 30 seconds.
It was the idler pulleys. The center bearing is getting dry
New idlers fixed it.
Take the belt off before you start it cold when you're fairly sure it would happen. Start and check for noise.
Spin the idlers and tensioner to see how they feel.

 

[vtwinjunkie]

I have an issue like this when the truck is cold and the temps outside are cooler than 70's.

If I turn the key to prime the oil pump before starting it pretty much goes away all together. This leads me to believe its related to that in my case.

 

[Gumby]

I have an issue like this when the truck is cold and the temps outside are cooler than 70's.

If I turn the key to prime the oil pump before starting it pretty much goes away all together. This leads me to believe its related to that in my case.

This might be a typo. if not the OIL pump dose not Prime with the key on. The engine has to be running for oil pressure. Unless you are running something special that the rest of us aren't. The Og sounds like something driven by the serpentine to me.

 

[vtwinjunkie]

Interesting, thanks for the call out on that. Thinking about it, perhaps I passed alot of assumptions along with my answer.

To answer you, I dont have anything special. my truck is stock.



The noise I have certainly is consistent on cold starts as mentioned, and goes away if I turn the key on and deliberately wait a few seconds before starting.


I assumed it was noisy tappets or something and it was oil pressure that solved that...but I suppose it could be fuel injectors or some other thing affected by fuel pressure?

I have no idea to be honest but that is what solves it.

 

[MTF]

@vtwinjunkie

You should be waiting a few seconds before turning key to start.
The truck goes through a quick series of checks
and it will give the fuel pump the few seconds it needs to properly achieve fuel line pressure.
If you have remote start you can listen to all the things clicking before it starts.

When was the last time you did fuel injector cleaning and MAF cleaning?

 

[mprice1234]

Interesting, thanks for the call out on that. Thinking about it, perhaps I passed alot of assumptions along with my answer.

To answer you, I dont have anything special. my truck is stock.



The noise I have certainly is consistent on cold starts as mentioned, and goes away if I turn the key on and deliberately wait a few seconds before starting.


I assumed it was noisy tappets or something and it was oil pressure that solved that...but I suppose it could be fuel injectors or some other thing affected by fuel pressure?

I have no idea to be honest but that is what solves it.

Have you done the fuse 27 relocation kit?

 

[vtwinjunkie]

This is the noise exactly.

6.2 cold start rattle - Ford F150 Forum - Community of Ford Truck Fans

Ford Raptor Forum - 6.2 cold start rattle - Trying to verify if this sound is what everyone else is hearing on cold starts. My 2011 with a 6.2 has this rattle nearly every start below 40 degrees. Ford is telling me this is normal for a 6.2. 2011 f150 6.2 cold start rattle - YouTube

www.f150forum.com

 

[Canuck714]

This is the noise exactly.

6.2 cold start rattle - Ford F150 Forum - Community of Ford Truck Fans

Ford Raptor Forum - 6.2 cold start rattle - Trying to verify if this sound is what everyone else is hearing on cold starts. My 2011 with a 6.2 has this rattle nearly every start below 40 degrees. Ford is telling me this is normal for a 6.2. 2011 f150 6.2 cold start rattle - YouTube

www.f150forum.com

Sounds like the lifters and the cam phasers before the oil pressure "pumps them up"
My high mileage truck sounded like that before switching to 5/30.