Question about 1985 Porsche 928
Not sure, but have you checked ALL of your vacuum lines for cracks/leaks - most likely cause is an air leak in vacuum lines or fuel inlet.
Posted on Mar 29, 2014
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Posted on Jan 02, 2017
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Throttle body tampering, excessive deposits, or damage. Refer to Fuel System Description .
Restricted air intake system
Large vacuum leak
Inspect the air intake ducts for being collapsed, damaged areas, looseness, improper installation, or leaking especially between the mass air flow (MAF) sensor and the throttle body.
Inspect crankcase ventilation valve for proper operation.
Inspect the throttle position (TP) sensor and related wiring. Refer to DTC P0123 .
Monitor the 24X crank sensor and the CMP sensor present parameters on the scan tool. If both are not responding, test the sensor feed circuit. Both sensors use a separate feed circuit but are internally connected to power. Test all CKP sensor A and CMP sensor circuits for intermittents. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Monitor the 3X parameter on the scan tool. If the 3X is not responding, inspect the CKP sensor B and circuits for intermittents. Inspect the ignition control (IC) circuit, IC timing control circuit, low resolution engine speed signal circuit and the low reference circuit for intermittents. If these circuits become open, or shorted may not set a DTC immediately, but are capable of causing driveability complaints. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test the exhaust gas recirculation (EGR) system for proper operation. Refer to Exhaust Gas Recirculation (EGR) System Description .
Inspect the transaxle range switch input with the vehicle in drive and the gear selector in drive or overdrive.
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The Idle Air Control (IAC) valve controls the amount of air that bypasses the throttle valve, which controls the engine idle speed. The IAC valve consists of windings, an armature, a return spring, and a rotary slide. The engine control module (ECM) pulses the voltage to the winding, the opposing forces on the armature by the return spring cause it to maintain a fixed position, adjusting the amount of bypass air to maintain the correct idle speed.
Removal & Installation
Checking Idle Air Control Valve (IAC) Triggering
Fig. IAC Connector
Fig. Showing the IAC Valve
WARNING Do NOT check for ease of movement by prying on the rotary slide with a screwdriver or other tools that could cause scratching or other damage.
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