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  #1  
Old 12-10-2017, 09:15 PM
Jdtractor Jdtractor is offline
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Default Knock when cold! 2008 2.3

like the title says I have a knock since the temperature has got cold! I'm having a hard time pin pointing it but does sound as if it's in the back of the head. As soon as the truck reaches full operational temperature it seems to go away. anyone ever experience this? Truck runs good just a "knock" sound that is present when cold. I've tried oil changes different oil grades 5w20 5w30 10w30 even pour Lucas in it thinner oil it's louder other than that oil has made no difference
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Old 12-12-2017, 07:46 AM
tomw0 tomw0 is offline
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Default Re: Knock when cold! 2008 2.3

Things that knock when cold are generally parts that get hotter than other parts. Meaning, in the past, pistons were subject to 'slap', which made a knocking sound, when cold, that went away when they got hot. The pistons were subject to 'collapse', caused by ???, I dunno. As the piston moved up in the bore, it was/is pushed more to one side of the bore by the connecting rod, and when the cylinder fires, the pressure is on the other side of the piston, against the other side of the bore. As the engine heats up, the piston expands(aluminum) more than the iron cylinder, and closes the gap, leading to less noise.
Other than that, it could be end play in a cam shaft, cam shaft follower, or a valve moving in its guide(not common to be noisy). Cam noises should be at 1/2 crankshaft noises. If you can figure the timing of the noise compared to crank speed, you may determine w/o further exam if it is crank or cam related. Using a timing light to flash and show 'cam' speed may enable you to determine if it is crank or cam speed as it triggers your mind to match the sound occurrence to the flicker occurrence of the timing light.
tom
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Old 12-12-2017, 08:33 AM
dvrich dvrich is offline
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Default Re: Knock when cold! 2008 2.3

Post a video. It can't be good at all to have this noise until the engine hits operating temp.
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Last edited by dvrich; 12-12-2017 at 08:38 AM.
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Old 12-12-2017, 08:59 AM
Jdtractor Jdtractor is offline
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Default Re: Knock when cold! 2008 2.3

I have a video it isn't at it's loudest but you can clearly hear it where's the best place to post it? YouTube then link it here? Figured I'm going to drop it off at the dealership today see what they say. Because I'm having a hard time pin pointing the noise. They told me $50 bucks they will find it.

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It's not the best I was all around under the hood under the truck, you hear it best when I'm inside the truck, you can clearly hear it threw the lifter injector noise. It hasn't gotten to beating loud as hell yet but that much noise in the video is with a quart of Lucas in it. I've drained it out and have 10/30 in it now, I'll post another video when I crank it to take it to the Ford place.

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I must not be smart enough to attach a link I've tried 10 times now.....

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http://http://youtu.be/CvIzOgHNp4o

Last edited by Jdtractor; 12-12-2017 at 08:58 AM.
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Old 12-12-2017, 09:27 AM
Jdtractor Jdtractor is offline
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Default Re: Knock when cold! 2008 2.3


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http://http://youtu.be/siECfIPXIC4
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Old 01-20-2018, 11:43 AM
Muroki2.3 Muroki2.3 is offline
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Default Re: Knock when cold! 2008 2.3

Yupp. Me too, do you use Lucas and 5w-30?


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