Engine Warm Test

Leave three-way valve in flow through position and throttle half open. Disconnect wire from warm running compensation regulator and jumper to B+ terminal of fuse box. Heating element in regulator will begin to heat and as it does control pressure should slowly increase, obtaining a final value to 3.7 ±.2 bar. Bring throttle valve to idle position. Control pressure should now drop to 3.0 ±.05 bar (idle speed enrichment). This value can be adjusted slightly as follows: On control pressure regulator for throttle valve, loosen both screws and turn compensator as much as elongated holes will allow. If pressure cannot be regulated by this method, replace throttle valve compensator. Now, slowly open throttle, control pressure in part load range should increase to 3.7 ±.2 bar. At full throttle, pressure must drop to 2.9 ±.2 bar (full load enrichment). If these values are not reached, replace throttle control pressure regulator. Check warm up and throttle valve regulator for leakage as follows: Loosen return hose on warm-up regulator, raise control pressure to 3.7 bar, switch off ignition and completely disconnect return hose. If pressure remains above 2.5 bar, no leakage is present. If pressure drops to 1.5 to 2.5 bar and no fuel is flowing from return socket of warm up regulator, replace throttle valve regulator. If, however, fuel is flowing from warm up regulator, replace this regulator.