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Volkswagen Workshop Service and Repair Manuals

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Water-heated and electrically heated automatic choke > < Checking and adjusting amount injected by accelerator pump

Golf Mk1

34 PICT, Keihin carburettor and ignition system
Servicing 34 PICT carburettor
Cold idling valve

(carburettor 055 129 015 L/Q/R only)

The bore of the cold idling valve changes as a function of coolant temperature.

Engine code

Temperature

Nozzle size

FH

below approx.
14 °C

60

above approx.
20 °C

52.5

FN

below approx.
12 °C

62.5

below approx.
50 °C

52.5
 
V22-0086

→ At coolant temperature below approx.14 °C/12 °C vacuum passes via the thermopneumatic valve -2- to the cold idling valve -1-. This increases the nozzle this reduce the nozzle bore.
The valve -2- closes above approx. 20 °C/50 °C.
This reduces the nozzle bore.

Note:

The off-centre connection at the thermopneumatic valve -2- must be connected to the cold idling valve.

Checking cold idle valve

  • ● Minimum engine oil temperature 60 °C.
  • ‒ Connect up CO tester V.A.G1363 A as per the opening instructions.
  • ‒ Start engine and let it idle.
 
V22-1695
  • ‒ → Connect vacuum connection of cold idle valve to intake manifold -arrow-.
  • ‒ The CO content must increase to in excess of 6% by volume. If applicable, renew the cold idle valve.

Removing and installing cold idle valve
 
V22-0225
  • ‒ → Remove and installing with 2053.

Checking thermopneumatic valve

  • ‒ Blow through valve.

Engine code FH:

Below + 14 °C - open

above + 20 °C - closed

Engine code FN:

Below + 12 °C - open

above + 50 °C - closed
  • ‒ Renew valve if necessary.

Water-heated and electrically heated automatic choke > < Checking and adjusting amount injected by accelerator pump