10-16-2016, 06:04 AM
after defeating EGR.
cure bad idle.
find cause.
a bad idle (or surging ) tells you the engine is not running right, Or the ISC is jammed.
ISC has 2 wires
and is on the front box plenum left side in front of throttle body.
The engine needs to be at 180f temps for idle controls to work. top rad hose, touch with hand if had flies off ouch, its at 180f or more, good. if not bad.
The ISC is not thermal but the IAC is, 100% thermal it its water supply must flow good , it not the engine RPM will SCREAM even 2000 rpm easy hot.
cure bad idle.
find cause.
a bad idle (or surging ) tells you the engine is not running right, Or the ISC is jammed.
ISC has 2 wires
and is on the front box plenum left side in front of throttle body.
The engine needs to be at 180f temps for idle controls to work. top rad hose, touch with hand if had flies off ouch, its at 180f or more, good. if not bad.
The ISC is not thermal but the IAC is, 100% thermal it its water supply must flow good , it not the engine RPM will SCREAM even 2000 rpm easy hot.
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