Northstar Engines and System Technical Discussion Discussion, bad idle and shuts off in Cadillac Engine Technical Discussion; just adjusted the ISC motor i have a question , when i adjusted the gap and reconnected the ISC motor ...
just adjusted the ISC motor i have a question , when i adjusted the gap and reconnected the ISC motor , the plunger still hits the throttle plate , is that normal? idle jumps to about 500 and lower sometimes it shuts off the car in cold weather, the egr is cleaned , could it be carbon chunks somewhere in the egr valve passage?
car is a 1994 STS northstar
The plunger should touch the throttle when it is idling. There should be a gap when the engine is off. How did you adjust it?
i followed instructions from here , hold rpm and push plunger to retract at the same time i disconnected the motor cable , then the car stalled on me though , im not sure that was supposed to happen but i continued adjusting the gap with engine off . when i adjusted the gap i reconnected the cable
because of the bad idle and car shuts off, should i just screw the plunger back while the car is off more? i will check for leaks . also TB is clean , no codes on the car either
edit : the ISC motor is also replaced with a new one
EGR only operates with the engine running at light to moderate loads; it does not operate with the engine off or at idle.
You could test the valve by removing it and applying 3 to 5 VDC across the terminals - it receives a varying voltage according to a PCM signal - matter of fact it may not operate until the emissions systems go open loop at 160 degrees coolant temp.