Golf GTI L4-1781cc 1.8L SOHC (HT) (1985)
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hose (3) from air filter
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remove "T" connection (4) from carbon canister at intake air boot
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turn "T" piece 90~ and insert blank side with 1.5 mm (0.059 in.) restrictor into hole in intake air boot
Note
If car is not equipped with this type of connector, use part #026-133-382D or equivalent plug with 1.5 mm (0.059 in.) orifice.
Idle speed/ignition timing/OXS-duty cycle (CO value), checking/adjusting
Work sequence
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connect duty cycle meter VW 1367 or Siemens 451 for measuring ignition timing and rpm
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run engine at idle
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check ignition timing, and adjust if necessary
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speed under 1000 RPM
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checking specification: 4 - 8~ BTDC
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Adjusting specification: 6 +/- 1~ BTDC
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check idle speed, if necessary adjust with idle adjusting screw (5)
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checking specification: 800 - 1000 RPM adjusting specification: 900 +/- 30 RPM
CAUTION
Inductive pickup (on VW 1367) must NOT be connected.
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remove cap from CO measuring pipe and connect CO test equipment hose
CAUTION
Hose must fit tightly on measuring pipe, so that there are no exhaust leaks.
OXS Duty Cycle & Emission Control Information
OXS duty cycle for duty cycle valve and CO content, checking
Checking specifications:
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OXS duty cycle 20-70% reading must fluctuate
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CO-content 0.3-1.2%
Note
If the CO content is more than 1.2% by volume at an OXS duty cycle reading of 20-70%, this is not caused by incorrect CO adjustment.
Possible Causes