Clank Sound Start Up

C

Chilow

New member
This morning, I noticed a strange clanking noise coming from the front. The vehicle was parked outside overnight and this was a cold start. Car drove fine so I'm not sure how serious this could be.

Not sure how long this has been going on. I normally start the car with the door closed, but this morning I started it up with the driver door open and that's when I heard the noise.

I will try again tomorrow morning, but wanted to see if anybody else experienced this. This is a 2014 SR4 4x4 model with a little over 100k miles.
 
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Chilow said:
This morning, I noticed a strange clanking noise coming from the front. The vehicle was parked outside overnight and this was a cold start. Car drove fine so I'm not sure how serious this could be.

Not sure how long this has been going on. I normally start the car with the door closed, but this morning I started it up with the driver door open and that's when I heard the noise.

I will try again tomorrow morning, but wanted to see if anybody else experienced this. This is a 2014 SR4 4x4 model with a little over 100k miles.
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Can you make a sound clip so we can help?
 
This poor little guy is probably frozen...

hamster-power.jpg
 
fkheath said:
Just a guess -- sound a bit like valve noise. Caused by the hydraulic valve lifters bleeding down after a long sit. No harm done if it goes away soon after the oil pressure builds up.
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Yeah, in the video it sounds like a lifter bleeding down.

Next time it does it, turn the car off immediately, wait a couple seconds and restart. If it doesn't happen again, it's probably a bled down lifter.

If it DOES happen again, and it hasn't been this cold in a while, there's a chance that because of the cold, that a heat shield or something that's now JUST close enough to make contact. Metal moves as a function of temperature. It's possible that there due to extreme cold it's moved enough to make contact. My pickup truck did this.
 
Update: started the vehicle this morning and heard it very slightly. Lasted like half a second. Around the same time in the morning as last time. Temperature was about the same as well.
 
ctnewman said:
Is it just cam on valve? I'm still in the stoneage over here spending most of my time working on old harleys.
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No, not cam on valve. "Solid lifters", adjustable or not, on cars are long gone. All modern cars have a hydraulic device to take up any valve gap.

They have a one way valve to pressurize a piston with engine oil pressure. The factory repair manual has a good illustration of the device on page 4244.

If the one way valve leaks a bit, they will bleed down, causing a chattering noise until the oil pressure recharges them.
 
Last edited:
Sounds like starter disengaged flywheel and continued to run while trying to re-engage the flywheel. Has nothing to do with valve train.
 
08TxRunner said:
Nope. A lash adjuster is not a lifter. We should try to use the proper terms.
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You're being pedantic. And you're missing the point.

The point was whether collapsed hydraulic followers could be the source of a start-up clank. Whether the followers are technically "lifters" is irrelevant. Your post implied that the engine has no hydraulic followers of any sort.

And of course all this is irrelevant since the noise has been identified as something else.
 
My post implied nothing other than the correct facts. Interesting that you're now using the correct term though. But hey, you can lead a horse to water...
 
08TxRunner said:
Nope. A lash adjuster is not a lifter. We should try to use the proper terms.
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As I said before, a rose by any other name-----. See my earlier post. It is still a hydraulic device, but the Toyota engineers put it on the other side of a rocker arm (see the picture in the factory repair manual), just not directly inline with the valve/valve stem. Same function, same purpose, different location.
 
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