Cold start rattle?

[glock-coma]

My rattle is similar to yours SoCal. I've  been letting it crank for a few seconds by holding the gas pedal all the way to the floor then starting.
It does not rattle when you do this. So I'm assuming it's letting the engine build up oil pressure or the tensioner is adjusting durning cranking.

 

[SHOdded]

Makes you wonder if you should be running a detergent package of some sort via the crankcase to clear any sludge out of those tiny oil passages ...

 

[glock-coma]

I'm running pennzoil platinum 5w-20 per the manual. I have a 2010. I'll be switching to5w-30 next oil change for the summer.

 

[ZSHO]

Socalflexin as you are aware these cars demand a good top teir full synthetic oil and 93 octane gas,the full synthetic oil that you just added will slowly dissolve out the sludge and NOT CLOG up your oil filter,in order to acheive this personaly would try changing it out again after 800 miles or so in order to clean up any leftover buildup and see if it benefits any,BTW using a good fuel system cleaner like chevron techron will help some,hope this helps any and keep us updated. Z

 

[curry67]

Can you see the teeth on the tensioner or is it internal? I've almost always had this issue always used pennzoil platinum or Mobil 1 with Motorcraft filter. I've heard it needs to skip x amount of teeth before they replace.

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[SHOdded]

Tensioner is behind a cover, so not readily visible from outside.

 

[ZSHO]

Heres a pic of the timing chain,surely a pita to perform,and agree with SHOdded,the tensioner is pretty much isolated. Z

 

[jtoddk98]

https://vimeo.com/128813229
What my car sounds like on a cold start. Timing chain?


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[SHOdded]

Possible, in early stages, as it doesn't sound continuous yet.  If you have access to a mechanic's stethoscope, you can narrow down the source (yes, there can be reflected sound, but still worth it).

 

[ZSHO]

I read somewhere that there is an updated timing chain and tensioner,found a pretty good site that shows the updated parts. Z    http://parts.lakelandford.com/showAssembly.aspx?makeName=ford&modelYear=0&modelName=flex35l-v6-automatic&ukey_assembly=6484232&ukey_product=53566104&assembly=t187040            http://parts.lakelandford.com/images/parts/motor/fullsize/T187040.png

 

[68_GT]

https://vimeo.com/128813229
What my car sounds like on a cold start. Timing chain?


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that's what min sounds like on cold start up, but not everytime. Maybe the longer it sits makes it more likely to happen. I'm going to say its the timing chain tensioner because my previous G35 did the same thing.

 

[jtoddk98]

Yea, it only does it when it sits for a while, this is when I started it today after being out of town since Friday, so about a 3 day sit.


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[painterpatt]

https://www.youtube.com/watch?v=FT_77mKfbMM

 

[jtoddk98]

I had my oil changed with Amsoil Signature series, the noise went away, haven't heard it since the change


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[SHOdded]

Be good if it stays that way

 

[SoCalFlexin]

Be good if it stays that way

Please keep us updated, my noise also goes away for about a week after i change the oil.