welcome !!!
what year? car?
the idle issues are different cold and hot engine
cold start, is going to be 1500rpm due to the dash pot , then after a few seconds the dashpot retracts 100%
the IAC air valve will be open cold (wax pellat valve) that is open up to 150F then closes, all by that wax deal.
the Throttle body is a dirty starting engine with WET injection, so to make it atomize on TBI engines, the do run fast idle cold. or the fuel puddles. in the plenum
and makes smog.
now ill talk TBI hot start.
this is when the IAC is closed after all the IAC is closed at 150F and is now 180f.
but the dash pot there, sill works at all times, it causes fast idle at start. (watch it yet?) see it open the throttle with this vacuum servo rod?
then it retracts. and idle will be 800 hot. 750 to 850 is spec.
but if the ISC can not control idle then it can go anywhere. (unregulated that is)
trying to change the IAC is wrong, if it closes at 150f then its working 100% ,that gap dont matter much. closed matters at 150f
i dont know what TBI you have,
1989
1991
1995 are different.
does your ISC have water pipes?
there are many tests.
but if the engine is hot , iAC is closed now, and is not a factor.
if you dont like the dash pot and mess with it, the ecu will get very confused, it assumes its working,.. do not defeat it, is my IDEA.
now regulation, if you have air leaks (vacuum leaks plenum) then the ISC closes, and the ecu can not drop rpm to 800
the ECU and ISC both fail. they can not close the valve over 100% this is impossible.
so we get the leaks cured.
is the TBI throttle valve 100% closed, (dash pot retracted by hand)
got his part here.
as the ISC is dead if the TPS idle switch fails.
got this air bleed?
http://www.fixkick.com/fresh-air/Slide_S...age_5.html
best is to work 1 problem at a time.
1: water temp good and hot 180F or more engine hot.? must be.
2: idle switch closed at hot idle. or with dash pot servo retracted by hand , engine off.
3: is 800 rpm regulation working hot? turn on head lights, and heater fan does RPM hold steady at 800 RPM?
what year? car?
the idle issues are different cold and hot engine
cold start, is going to be 1500rpm due to the dash pot , then after a few seconds the dashpot retracts 100%
the IAC air valve will be open cold (wax pellat valve) that is open up to 150F then closes, all by that wax deal.
the Throttle body is a dirty starting engine with WET injection, so to make it atomize on TBI engines, the do run fast idle cold. or the fuel puddles. in the plenum
and makes smog.
now ill talk TBI hot start.
this is when the IAC is closed after all the IAC is closed at 150F and is now 180f.
but the dash pot there, sill works at all times, it causes fast idle at start. (watch it yet?) see it open the throttle with this vacuum servo rod?
then it retracts. and idle will be 800 hot. 750 to 850 is spec.
but if the ISC can not control idle then it can go anywhere. (unregulated that is)
trying to change the IAC is wrong, if it closes at 150f then its working 100% ,that gap dont matter much. closed matters at 150f
i dont know what TBI you have,
1989
1991
1995 are different.
does your ISC have water pipes?
there are many tests.
but if the engine is hot , iAC is closed now, and is not a factor.
if you dont like the dash pot and mess with it, the ecu will get very confused, it assumes its working,.. do not defeat it, is my IDEA.
now regulation, if you have air leaks (vacuum leaks plenum) then the ISC closes, and the ecu can not drop rpm to 800
the ECU and ISC both fail. they can not close the valve over 100% this is impossible.
so we get the leaks cured.
is the TBI throttle valve 100% closed, (dash pot retracted by hand)
got his part here.
as the ISC is dead if the TPS idle switch fails.
got this air bleed?
http://www.fixkick.com/fresh-air/Slide_S...age_5.html
best is to work 1 problem at a time.
1: water temp good and hot 180F or more engine hot.? must be.
2: idle switch closed at hot idle. or with dash pot servo retracted by hand , engine off.
3: is 800 rpm regulation working hot? turn on head lights, and heater fan does RPM hold steady at 800 RPM?
http://www.fixkick.com