exhaust sound after startup - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 07-12-2012, 11:47 AM Thread Starter
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exhaust sound after startup

A few seconds after I fire the engine up, there is a weird change in the exhaust sound for a few seconds. Almost like a valve is opening or something and then closes again?? I'll try to take a video if I can...I'm trying to figure out how to describe the sound...

06 F350 Lariat
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Blue Spring Update, EGR Delete, STC update, Stand Pipes and Dummy Plugs, Turbo feed and drain tube update, Sinister coolant filter, New stock oil cooler, Zerex ELC, RiffRaff Boots, Isspro Fuel PSI, DC Alternator, ARP Studs, Heads from Jared, OEM Head Gaskets, Yukon Dura-Grip Posi
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post #2 of 4 Old 07-12-2012, 11:59 AM
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I think what you are hearing is the vanes cycling in the turbocharger?


2005 Harley F-250 CCSB
True Blue Metallic

Engine: ARPs, OEM oil cooler, Bed plate reseal, OEM HGs, Stand Pipes, Dummy Plugs, STC Fitting update, Bulletproof EGR, Rotella Ultra ELC, Sinister Coolant Filter, Machined stock heads, Blue spring

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post #3 of 4 Old 07-12-2012, 12:50 PM
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Ha Ha Ha - I am laughing with you and not at you.

I had the same thought on day one with the truck. It is the VVT.


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post #4 of 4 Old 07-12-2012, 01:05 PM Thread Starter
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Thanks...it's just weird I hadn't noticed it before.

06 F350 Lariat
Edge Insight CS
Blue Spring Update, EGR Delete, STC update, Stand Pipes and Dummy Plugs, Turbo feed and drain tube update, Sinister coolant filter, New stock oil cooler, Zerex ELC, RiffRaff Boots, Isspro Fuel PSI, DC Alternator, ARP Studs, Heads from Jared, OEM Head Gaskets, Yukon Dura-Grip Posi
Warren 155cc/stock injectors
SCT with tunes from Vivian
Western 8-1/2ft Pro Plow with UltraMount
Hansen Front Mount Snow Blower
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