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Clunking noise

953 Views 2 Replies 2 Participants Last post by  jd67
Hello all I have a 02 F250 4X4 7.3 I was just at a store and when I started the engine I heard a loud clunking noise. I was sitting there for about 45 sec. engine running and not in gear. I don't like to here any noises like that so any info would be great. The truck is all stock no upgrades at all.

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Did you by chance have the air conditioner on? If you shut down your truck and left the AC on, a vent door is left open. When you start up the truck, is shuts creating a thump. Maybe it is vice versa, but this could be one reason.

- C
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