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Old June 2nd, 2020, 09:59   #11
Join Date: Dec 2013
Location: Nevada City, CA

Originally Posted by QuickTD View Post
The problem is manifesting only at light throttle, indicating a lack of boost at low engine speed and load. Most likely culprit is the vane control system. I'd check vacuum lines again, and possibly replace the N75.
Plugged cat would be worse at high speeds and bad injectors are virtually unheard of, at least until you reach 400-500k.
Yeah, the plugged cat didn't make sense after I thought about it.

Glad to hear on the injectors.

The turbo appears to be genuine Garrett.

I guess I'll run through the vacuum diagnostics once more. Can the turbo be clocked against the vane system where it could appear in spec from the actuator but actually be out of spec?

Also, I'm thinking of shortening the actuator despite it appearing in spec- am I correct in thinking I can't really do any damage by doing this as long as I don't overboost it?

One check I did to make sure I wasn't over speeding the turbo- I compared MAP readings to boost and rpm- at 3500 rpm and 2.5 bar i was seeing ~140g/s which matched conditions closely enough for me to have a little peace of mind
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