Table of contents: Valve check I ↓ Checking valve II ↓
As soon as the idle speed drops below 700 rpm, for example due to additionally switched on energy consumers, the dual-line valve I increases the speed back. Valve II equalizes the speed when the air conditioner is switched on.
Valve I is controlled by the speed control device, which is located on the auxiliary relay board on the left under the switch panel at location 11 (KE-Jetronic). Valve II comes into operation when the air conditioning system is turned on.
Warm up the engine. The oil temperature should be around +80°C.
Connect the tachometer with the ignition off according to the instructions.
Start the engine and let it idle.
Turn off the air conditioner.
Valve check I
Turn on all electrical consumers (the air conditioner remains off).
Screw in the idle speed adjusting screw. At 700 rpm, valve I should open and the speed should increase.
Clamp hose "1" with pliers. The number of revolutions should drop.
Set the speed with the hose clamped using the adjusting screw to 900 rpm.
Remove with pliers, the number of revolutions should increase to 1050 rpm.. then the valve closes and the number of revolutions drops to the required
Checking valve II
Clamp hose "1" with pliers. The number of revolutions should not change.
Turn on the air conditioner and check. The number of revolutions with the hose pinched should drop.
Caution: Check that the hose connection branch is positioned correctly. The larger opening must face valve II.
(The original version is on the portal: «audimanual.ru»)