Idle Adjustment

With engine at normal operating temperature and a tachometer and CO meter attached, proceed as follows:

1. Make sure that auxiliary air regulator is completely closed by pulling off hose between intake duct and the regulator and covering the opening with the hand. The speed should not differ to any extent from the previous RPM. If speed does differ significantly, engine is either not warm enough or the air regulator is faulty. Reconnect hose.
   Idle Adjustment Specifications
   
   

   Model			CO%	Idle RPM
   Mercedes Benz
   	1968-69		1.5-3.0	750-800
   	1970-71		1.0-2.0	750-800
   	1972-73		.5-2.0	700-800
   Porsche 914
   	1970-71		.7	850-950
   	1972		.7	850-900
   	1973
   		1.7 Liter	.7	850-900
   		2.0 Liter	1.5	850-950
   Renault
   	1972		2.0-3.0	950-1050
   	1973			950-1000
   Saab
   	1972		3.5	800-850
   	1973		2.5-3.5	800-900
   Volkswagen
   	Type
   	1968
   	1969-70		2.8-3.1	(1)850-900
   	1971
   	1972		.7	(2)800-900
   	1973			(2)900-900
   Type 4
   	1971
   	1972		.7	850-900
   	1973			850-900
   Volvo
   	1970-72		(3)1.0-1.5	(4)900
   	1973		(3)1.0-1.5	(5)800
   (1) Auto. Trans. 1000 (2) Auto. Trans. 900-1000 (3) Auto. Trans. 0.5-1.0 (4) Auto. Trans. 800 (5) Auto. Trans. 700

2. Adjust idle speed to specifications by means of throttle stop screw. Reconnect hose from air cleaner.
3. Adjust CO% to specification using the adjusting screw on the control unit. Turning the adjusting screw clockwise increases the CO content.