weird noise when start NEED HELP
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Location: anchorage, ak
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weird noise when start NEED HELP
I have a 00 f150 5.4L V8. i just hit 90000. Over the last 2000 miles a weird noise has occured. When I start the truck it makes a noise coming from the front passenger side of the engine bay. it goes away after about 1 minute or until i drive off an reach about 2000 RPM. you dont hear it while driving just when the trucks been sitting and I go to start it. the noise it makes kind of souds like a diesel truck.. I went to 3 exhaust shops and got 3 different answers from them. 1 said it was manifold gasket, 1 said it was the cat, and the other said it was a lifter.. Im running out of ideas of how to pinpoint this noise...anybody run into this problem or have any encite as to what to do?