Compression Ignition Addict
Join Date: May 2009
Location: In the country south of Covington TN.
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There are lots of things that can change the 'note' of the intake/exhaust sound. (Can you hear it in the exhaust as well?) Could be things like injector electrical issues like the UVCH, IDM etc. Injectors themselves or their o-rings. Could be mechanical issues like a bent push rod, valve/ring/piston failure. I'd start with a scan and cylinder contribution test to see if it is a weak cylinder. If one's found go from there. (buzz test, look into UVCH issues, compression test etc) I've heard engines of all sorts make that sound when a hole is weak. Good luck with it.
Randy DuCharme (Radio AD5GB)
'06 F-250 FX4 A/T Super Cab short bed /w tow pkg
SCT SF3 tuner /w Gearhead Performance custom tunes. ARP head studs, EGR delete, oil cooler/drainback tube/STC coupler/blue spring/standpipe & dummy plug upgrades, ScanGauge II, Sinister diesel coolant filter, Fumoto drain valves, Stage II direct clutch and ECP solenoids.