Bucking when hot, solved!

[Kaasler, Ingvar]

Thanks to all who replied last week. 

My problem turned out to be a leaky vacuum line that goes from the top
of the Wastegate valve to the WG solenoid.

Last year I had replaced all my vacuum lines with silicone tubing. This
particular line had a small tear in it. Once I replaced it, the bucking
has not returned. 

This makes me wonder, is silicone tubing mechanically as strong as
rubber? It feels very soft and pliable as compared to rubber vacuum
tubing. 

What is the consensus on silicon tubing?

 

Ingvar Kaasler

CBS Telecom

212 975-4447