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06-25-2023, 04:44 PM

#11

RJ_RS_SS_350

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Join Date: 05-01-2014

Location: California

Posts: 7,813

I can't imagine how you have so much vacuum. My brand new engine had(still has 3 years later) 20 inches of vacuum. My old engine was about 19 inches.

Anyone care to speculate?

06-25-2023, 04:57 PM

#12

Oldblue

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Join Date: 10-13-2011

Location: Welland,Ont Canada

Posts: 36,536

Intake (induction) air restriction or leak Failed or damaged turbocharger (sticking, binding, etc.) Faulty boost/charge pressure sensor Faulty wastegate bypass regulator valve (VW) Low fuel pressure condition (Isuzu) Sticking turbo nozzle control solenoid (Isuzu) Faulty injector control pressure (ICP) sensor (Ford) Low oil pressure (Ford) EGR system fault (Ford) Variable geometry turbocharger (VGT) actuator (Ford) VGT vanes sticking (Ford)