ZR-1 Net Registry Forums - View Single Post - Diagnose - 2,500 rpm Stumble Miss - 1991 8k mile ZR-1

SteelBlueZR1 · 05-19-2013

Update: we ran the Tech 1 at a Wazoo Carlisle get together (thanks Kevin!)... and it diagnosed a bad secondary solenoid switch. switch likely damaged by backfire from bad Map line.
So after doing my first plenum pull and replacing the the Secondary Port Vacuum Solenoid, and my vacuum resorvoir, tested secondaries and my car runs like a champ; the intermittent loss of power and rough running over 2,500 rpm is now a distant memory. I think the bad MAP sensor hose caused a backfire that damaged the selonoid.
Thanks to everyone for their help.

05-19-2013	#22
SteelBlueZR1 Join Date: Aug 2011 Location: Evergreen, Co. Posts: 344	Re: Diagnose - 2,500 rpm Stumble Miss - 1991 8k mile ZR-1 Update: we ran the Tech 1 at a Wazoo Carlisle get together (thanks Kevin!)... and it diagnosed a bad secondary solenoid switch. switch likely damaged by backfire from bad Map line. So after doing my first plenum pull and replacing the the Secondary Port Vacuum Solenoid, and my vacuum resorvoir, tested secondaries and my car runs like a champ; the intermittent loss of power and rough running over 2,500 rpm is now a distant memory. I think the bad MAP sensor hose caused a backfire that damaged the selonoid. Thanks to everyone for their help. Last edited by SteelBlueZR1; 06-08-2013 at 08:05 AM.