WEIRD noise when engine starts after sitting for a couple days,, sounds like coming from front and like plastic gear grinding for a couple of seconds from front of engine,, DOES NOT REPEAT after engine has started and truck runs from point to point,, why after sitting for 2 days would this component ,,what ever it is do this ?? and what is it ?? driving me nuts,, would i have to let it sit by dealer for 2 days to let him have a ONE SHOT CHANCE of finding this thing ?
don't think they could find it in one shot and running outta warranty this fall,,
thanks for any info

 

How old is the truck and what kind of oil are you using?

It could be something that's called "piston slap".

After your engine sits for a long time most of the oil that's distributed onto the cylidner walls drips back down into the pan. Sometimes when this happens when you first start the engine you will hear the piston "slap" against the cylinder wall until the oil pumps up to the top of the engine and the oil control ring distributes new oil onto your cylinder walls.

If you live in a cold climate it's more prone to happen and if you use engine oil with a higher viscocity than the manufacturer recommends it could also happen.

 

It may be the anti drainback valve in the oil filter might be defective?
It sounds like it could be a little dry at startup.
If it's piston slap the noise is usually there until the engine warms up.That's what some Chevy guys told me,they know more about piston slap than I do.

 

I replaced my factory oil filter with remote dual FL1A filters. The oil now has to pump through about 2 ft. of hose, through both filters and back through another 2ft of hose to the engine. The first startup after I change my oil I now get piston slap for about 1/2 second.

 

That is valve train chatter you are hearing after an oil change, not piston slap.........and I swear I have this same noise (from the original post, not valve train chatter).....I let it sit for 2 days it does it on every startup. I crank it and as soon as it fires, I hear that noise for about 1 second as the engine comes to life and then as soon as it is running it stops. I just thought it was the S/C raising hell until the bypass valve built up enough vacuum to open. It may be this, and I am hearing another noise. Mine sounds like something tearing, like tearing a thick piece of contruction paper really quick. Wow, noises are hard to describe.........

 

Mine does it too sitting up for a weekend or so. As long as it doesn't blow up, I ain't gonna worry about it. I read recently that some start up noise may be from a faulty cam phaser; previously, I thought the phasers only make noise at hot idle.

 

MATT, you are the closest one with noise,, with the construction paper ripping, i thought more like a piece of plastic touching the flywheel gear or another gear for 2 seconds and the truck has to be sitting for at least 1 day, (then you will hear it faint), 2 days sounds like something is going to break, then does not do it again til truck sits,, i know what valve clatter is after doing a oil change,, this is not it,, it must be something about losing pressure somewhere when truck sits that this component makes noise,, going to talk to FORD and see if i can get a answer,, if i have to will let truck sit over weekend by dealer and then i will return and start truck up with mechanic on monday,, when i have a answer will post it for you guys,, thanks,, john

 

Hopefully it's something simple like a bad fan clutch.

 

My friend had a problem sililar to this for a while and one day I started my truck and it started to knock so I shut it off. I went to start it again and it would not start so I sent the truck to the dealers. It ended up being the same thing on both of our trucks, it was something to do with the timing. GOOD LUCK MAYBE THIS HELPS!