Loud whistling after EGR delete
Had my truck in the shop for an EGR delete. The shop was horrible. Had the truck for 3 months, multiple problems when they would call to say the truck was ready so I'd have to leave it so they could continue trying to fix it.
Anyway, they had the turbo in & out so many times, they broke a few things. First it had an exhaust leak so they had to pull everything back off & replace some gaskets. Then they broke the ypipe or uppipe, whatever, from taking everything out so many times & replaced that. Then when I test drove it after that, it started leaking oil from the line that goes to the turbo so they fixed that.
So this whistling sound is extremely loud. The truck makes good boost & drives fine & according to the idiots, I mean repair shop, it's making good exhaust back pressure so they said it can't be a leak. The turbo did go out a couple times. While driving, the whistling would go away & no boost. I traced that to the connector that goes to the VGT solenoid. They broke the connector so it was making an intermittent connection.
If I disconnect the VGT solenoid, there's no more whistling, but of course no boost. It seems to me like it's an exhaust leak. Or could it be that the vanes in the turbo are not doing what they need to do? The boost spools up really quickly, so could the solenoid not be opening the vanes under load like they should?