Strange Issue with NPP
Thread Starter
Safety Car
Joined: Nov 2007
Posts: 4,435
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From: Bay Area CA
Strange Issue with NPP
When I shift at WOT from 2nd to 3rd gear (manual) the NPP valve stays closed going into 3rd gear. NPP opens in second, but once I shift into third gear it stays closed. When in third gear, if I back off the throttle and then go WOT again, the NPP valve opens. Strange, it stays closed when I am shifting at WOT? I repeated this several times with same results. Traction control is off. 2008 base coupe with oem NPP. Never had this happen before. Vacuum lines are connected at the valves. Solenoid?
Anyone experience this?
Anyone experience this?
Last edited by Mike's LS3; Oct 10, 2016 at 12:38 PM.
