No Whistle at Idle
Sorry guys I havent been on here in a while, and I cant seem to find the answer by searching it. Truck was a sick puppy for the past few months, had to go in for new head gaskets, ended up being a bad Ford factory reman head and it blew a gasket on me after 60k. I cant confirm this has anything to do with my issue below, because the truck sat for a while and when driven was driven very cautiously due to the head gaskets.
So now to my issue. I get the truck back, and at idle the 4" straight exhaust sounds like a farty cummins, it doesnt have the jet engine sound it used to. Truck seems to boost fine above 1500rpm, and will hit the #s on the top with my IDP race tune. It "seems" lacking on the low end, and the exhaust sound is an indication. One test I did try is disconnect the VGT solenoid, the sound at idle is the same, tells me the turbo vanes are not in the right position at idle. But if I drive with the solenoid disconnected it is obviously different, so I know the VGT is doing something on the top end. When I shut the truck off warm, it doesnt have any wind down sound at the tail pipe or at the turbo, it sounds like engine just stops dead, and the turbo wasnt spinning.
Does this sound like a typical sticking VGT turbo needs to be cleaned? Most people complain about boost on the top, mine seems to be on the bottom. Or a bad solenoid?