Ok, the 124 chassis CIS-E setup uses a ide speed control valve for idle. This is controled vis the CIS-E ECU. This valve is naturally closed during driving, there are 2 things I'd look at, 1) gummed up ics valve (just pull it off and clean it with carb cleaner by way of filling it, putting your fingers over the holes and shaking it, then dump and repeat until the carb cleaner comes out clear) 2) make sure the closed throttle switch is working and the linkage is making contact with it in closed posistion.


The ics valve is a tube mounted in front of the air horn behind the thermostat housing on top of the intake, retained by 2 10mm head bolts, 2 hoses and a connector. The closed throttle switch is on the backside of the intake in that nicely over engineered linkage, little black fellow with a connector on it and a silver arm on the side that the linkage depresses when closed, check it with a ohm meter, current flow closed, none open.


I had one that had rusted out the rear freeze plug in the intake that did wild stuff at idle as well look for vacum leaks, coolant temp sensor function and harness condition. The only real control for warm up fuel adjustment on this is that sensor. Once hot, the O2 comes into play. The rubber bottems of the airflow sensor will bust, ics bypass hoses will split and the vacum lines on the side os the throttle body will split as well. The vacum switch for the EZL advance control will fail as well causing minor running issues cold or hot depending on failed state. (function, cold no vacum pass through, hot vacum pass through) Located on the head near the ics valve.


Start/die on older 103's is nothing unusual when hot soaked however once running they should stay running.



Joe

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