Boost surge

[devster55]

Hey guys I have a 03 6.0 I'm currently in the middle of studding it and deleting it, it also has a 4 in turbo back straight pipe air raid intake and bully dog power hound chip. But enough about that before I tore it down the boost would drop up and down rapidly I was wondering if my bad egr cooler would cause this or fuel filter. Any help is appreciated. Devin

[RRF985]

Under what circumstances did this happen? Crusing, during shifting, accelerating, etc.?

[devster55]

Cruising. it builds boost just fine it will hit 32psi wot. Egr valve?????

[20046.0]

Check for boost leaks. Check out your turbo you could have sticking vanes.

[devster55]

The boot that goes from turbo to intercooler has small cracks

[devster55]

Bump anyone I'm just about done putting it back together.

[PolishPstroker]

You probably have sticky vanes in your turbo, the same has been happening to me for a while. I believe the problem is sometimes it will overboost and the VGT actuator will try to move the vanes to create less boost. And since the vanes can't get to there correct position it will buck and surge, losing boost and slowing the truck. If you had a leaky egr cooler, the moisture could help cause the problem of sticking vanes, but I'd say clean you turbo....there's a few g

[PolishPstroker]

......ood threads on how to take apart and clean your turbo

[devster55]

I cleaned it so we will see what happens

[devster55]

It's fixed got 2 psi more out of it