Golf GTI L4-1984cc 2.0L DOHC (9A) (1990)
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Remove yellow line from EGR valve and connect T-piece with vacuum test gauges to EGR valve. Connect vacuum pump to open end of T-piece.
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Start engine, run until warm and let idle. Idle should be normal.
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Activate pump. EGR valve should begin to open at 110 mbar (3.2 in HG), (read right gauge), a slight idle fluctuation should be noticeable
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Disconnect vacuum test gauges and T-piece to avoid damaging gauges. Reconnect vacuum pump to EGR valve as shown.
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Increase vacuum to 300 mbar (8.8 in HG) - read gauge on pump
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engine idle should be rough
If all specifications were obtained:
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EGR valve is functioning properly
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If NOT OK, replace EGR valve.
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After replacing EGR valve, recheck vacuum specifications.
F. Check EGR Vacuum Amplifier
F. Check EGR vacuum amplifier
(engine warm)
1.
Check venturi vacuum*