Cold start rattle?

[painterpatt]

Anyone else have this? on a cold start I get a slight "rattle" for a second. Definatly on pass side. Had wife start it today with my face buried on motor. Almost sounds like the throttle body. I saw a post on the Flex forum that said they were replacing the long block

[jcl78]

My thought would be cam phaser noise, same noise I hear on cold startup. Should be normal.

[painterpatt]

Well that makes me feel better !! Would those be the same on a NA 3.5? Wife's Explorer dont do it. Wonder why he's gettin a long block

[SHOdded]

What oil & filter do you use on the Flex?  If using non-Motorcraft filter, switching back to Motorcraft may solve the rattle issue.

[painterpatt]

Royal Purple, K&N filter

[thewrubelator]

It may sound silly, but check your heat-shielding around youe exhaust.  My truck had a rattle on start and it was from a piece of shielding rubbing a downpipe.

[breeves002]

+1 on the heat shielding.

[68_GT]

I have this issue also. Anyone else ? I saw videos on Youtube saying EB F150's having timing chain stretch

I ran a Purolotaor Gold oil filter, and put a Motorcraft in with no changes.

I'm at 50K miles - 40K tuned my SHO otherwise operates and runs perfectly. Running Mobil 1 extended performance full synthetic oil.

[CroR1]

I have a same rattle for 2_3 sec. Pin pointed it to down pipe location. I'm not sure if it's a shield around that area, but it seemed like it was coming from a flex pipe.

[68_GT]

I hoped for an exhaust rattle too, but how can you tell is actually coming from the exhaust and not something else near by ?

[WickedSHO]

I have something similar as well. Figured since I just had the car at Ford for an oil change they would have noticed it if something was wrong.....So I don't pay it much attention.

[mval]

i have as well & like painter said, it's definitely coming fro engine on passenger side. & wicked I think your giving the dealer more credit than is due. maybe you got a good one, but the ones in stl only do what you tell them & don't look for things wrong. I think in the old days dealers did more of that as warranty work keeps their people busy, but seems maybe ford & maybe the rest are cracking down on that to keep profits up. especially with all the recall work going on.

[painterpatt]

I'm pretty sure it's the timing chain tensioner, I thought I read somewhere the new 5.0 was having the same problem. Sounds exactly like my Wife's old 02 4.0 Explorer with the bad chain rattle at startup

[Jtrain]

99% exhaust issue. My G35 Does it too.

[SHOnUup]

October 20 2014 Ecoboost Cold Start Noise - Stret...: http://youtu.be/wHxCoPP_kSE

For the thread that's going right now.

Rich