Toyota Chaser GX100 E/G Stall

1997 Toyota Chaser GX100 Engine Model 1G-FE

Situation
The engine stalled at an idle.
Though it could start.

Cause
Faulty ISCV.

Maintenance
Diagnosis was properly.
I took off ISCV and cleaned it. but it stalled.
Internal resistance of ISCV was properly too.
I electrify a new ISCV  and confirm working.
It worked properly.

Toyota Chaser GX100 E/G Stall

1997 Toyota Chaser GX100 Engine Model 1G-FE

Situation
The engine stalled at an idle.

Cause
Faulty ISCV (idling speed control valve).

Maintenance
Diagnosis and fuel compression were properly.
The engine speed got high smoothly.
I thought that ISCV was faulty and checked it.
It worked properly but the head of the ISCV was dirty with sludge.
Then I cleaned it .
After that It worked properly.