Scirocco L4-1715cc 1.7L SOHC (1983)
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connect both plugs 3 together
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start engine
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if engine now starts and does not stall, connectors are OK: idle stabilizer is defective and must be replaced
Idle stabilization system, checking
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with plugs 3 connected to idle stabilizer 1, connect Siemens 451 or VAG 1367 tester
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set parking brake
Warning:
Make sure during following tests that no one is in front of car
Cars with manual transmission
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start engine
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run engine at idle speed
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read ignition timing on tester and note
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shift into 4th gear and release clutch slowly
^ ignition timing reading on tester must advance when rpm of engine drops below 840 rpm
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if no, replace idle stabilizer
Cars with automatic transmission
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start engine and wait until engine speed drops below 1,000 rpm
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run engine at idle speed
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read ignition timing on tester and note
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switch off A/C (if installed)
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switch on all electrical equipment, such as head light, rear window defogger etc.
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apply brake pedal
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move shift lever into gear
^ ignition timing reading on tester must advance when engine RPMs drop below 840 rpm
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if no, replace idle stabilizer