I can hear a rattle coming from my engine when I first start it when its been sitting for a few hours or overnight. It'll on last abiut a minute till the engine warms up. What could be causing this?

 

Hi jdm5630,

Hmm, this sounds like a good puzzle for your dealership to solve. Have you made an appointment so they can take a look? I'm certain they'd be happy to do some investigating and get this resolved for you.

Crystal

 

It's not a mystery. It's timing chain tensioners. I had mine replaced under warranty. Somewhat common on the 5.4 motors.

This can be verified with oil pressure test when cold.

 

Berry, how would I go about checking the oil pressure

 

The dealer performed the work under warranty. Sorry.

 

here is some advice.. GET IT APART FAST.. Mine did it.. I took it to dealer he said HEY no big deal drive it it is OK.... BS it had a broken guide that then went into the motor and RUINED it.. The dealer loved it as he said.. " you need a replacement motor" IDIOTS.. they wanted 10k.. I ditched the truck( of course FULL disclosure to new owner)

 

Unfortunately Berry is right.

Had the same issue on my '07 Navi last year (cold startup only)

Cost me about $1600 at the dealer.