Compression Ignition Addict
Join Date: Dec 2006
Location: Charleston SC
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Check where your downpipe makes the turn from coming down to going towards the back of the truck. It should go over a crossmember right after the turn, and if your downpipe joint has drifted a bit and is close to the crossmember, it can touch it and make the noise you described in various circumstances. Mine did it only at idle, but not above.
2004 F250 CC SB 4x4 Lariat
WIX intake with zoodad mod
(05 & up) Innovative Diesel intake elbow with butterfly valve manifold removed
4" SS T-Back no kitty exhaust
SCT X3 w/ I.D. Custom Tunes
Gauges: EGT, Boost, Tranny Temp
Pace Edwards bed cover / B&W Gooseneck Hitch / Linex
DieselSite coolant filtration system
DC Power Engineering 250A Alternator
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Submariners do it deeper!!!