Disconnect air inlet system so you can manually push open the flapper door in the VAM. Backprobe VAM connector with DMM between BK/W (SIG RETURN) and W/BK (VAM OUTPUT). TUrn key to run. With door closed, should get about .3 to .4 V. Slowly puch the door open. Voltage should smoothly climb to 4.5 to 4.8V. Any sudden jumps / dropouts, replace VAM. If this test passes, start car. At 1000 RPM hot idle, voltage should be steady and close to 1.0 to 1.1 V. When reving motor, VAM voltage should rise with RPM.
What PIP code are you getting continuous memory code 14? If so, the most common cause of this is not a bad PIP, but bad plug wires, cap, rotor. Do you have Motorcraft plugs and wires?
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Jeff Korn
88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 21 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 02 Taurus Vulcan(wifes car)
Jeff Korn
88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
11 Crown Vic Interceptor
14 Toyota Camry (wifes car)
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized