My Navigator sounds like a desiel when I first start it. After 30 sec. Its gone. on 2003 Lincoln Navigator

Noise is when truck is started and goes away after about 15/ 30 seconds of running. Sounds like a desiel or like the exhaust has a leak at the exhaust manifold .

Asked by for the 2003 Lincoln Navigator
double is correct or poss camshaft follwers are worn
Thanks for the help .
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1 more answer , 1 more comment
without actually hearing it we can only guess.But common issues are with the timing chain tensioners and guides.Also make sure the oil level is full and oil change interval has not been neglected.
Thank you for your help on my question. I was actually afraid you were going to say that.