Weird noise.

Stroked02F350 · #1 (**permalink**) 10-10-2009, 07:15 AM

So its a 2002 F-350. Only mods are afe stage 2 and MBRP 4" turbo back.
The noise started right after the exhaust. Only happens when the truck is started cold. It idles and sounds normal for about 3-4Mins then the banshee shriek from the tail pipe starts. I can rap the throttle once and it goes away and doesnt come back tell it starts cold again. If I take off driving as soon as it is started the noise never happens. Any ideas?

harrys91rs · #2 (**permalink**) 10-10-2009, 07:38 AM

That's the Exhaust Back Pressure Valve (EBPV) making that noise. It closes when its cold to help warm up the truck faster. Nothing to worry about.

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