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  #1  
Old January 26th, 2010, 15:04
chacon chacon is offline
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Default valvula IAC

es para un tbi 5.7, compre la valvula nueva la instale pero dura muy poco en las condiciones qe el motor requiere 600 rpm,, luego la valvula regresa a su condicion original de compra y esto ocaciona qe no baje de 1500 rpm,,

quisiera saber si hay algun paso en especial para la instalacion qe yo este ignorando??
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  #2  
Old January 26th, 2010, 15:39
pacoton pacoton is offline
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Default Re: valvula IAC

que modelo es tu camioneta?

que sistema trae de inyeccion?

a lo que yo se las revoluciones se regulan de acuerdo a el sensor de temperatura

yo cambie mi sensor y ahora en frio se acelera y cuando va tomando temperatura
se va desaselerando hasta quedar en la aceleracion que yo le tengo

mi sistema de inyeccion es TBI
  #3  
Old January 26th, 2010, 15:44
pacoton pacoton is offline
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Default Re: valvula IAC

te dejo la teoria de funcionamiento de la valvula IAC

Idle Air Control (IAC) Valve
The IAC valve controls engine idle speed to prevent stalling during engine load changes. The IAC valve is
mounted on throttle body and controls the amount of air by-passed around the throttle plate. The IAC valve
controls engine idle speed by moving its pintle in and out in steps referred to as "counts" (0 counts, fully seated;
255 counts, fully retracted). Counts can be measured by plugging a scan tester into the Data Link Connector
(DLC).
If engine RPM is too low, pintle is retracted and more air is by-passed around the throttle plate to increase
engine RPM. If engine RPM is too high, pintle is extended and less air is by-passed around the throttle plate to
decrease engine RPM. Normal counts on an idling engine should be 4-60. When engine is idling, PCM
determines proper positioning of IAC valve based on battery voltage, coolant temperature, engine load and
engine RPM.
If IAC valve is disconnected or reconnected with engine running, IAC loses its reference point and must be
reset. On some models, IAC is reset by turning ignition on and off. Other models require driving vehicle at
normal operating temperature over 35 MPH with circuit properly connected. Problems in IAC circuit should set
a related code.
The IAC valve affects only the idle system. If valve is stuck fully open, excessive airflow into the manifold
creates a high idle speed. Valve stuck closed allows insufficient airflow, resulting in low idle speed. For
calibration purposes, several different IAC valves are used. Ensure replacement valve is proper design.
  #4  
Old January 26th, 2010, 15:56
chacon chacon is offline
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Default Re: valvula IAC

mi sistema de inyeccion tambien es tbi,, modelo 92,, lo qe le pasa a mi camioneta es qe no sostiene la marcha minima
  #5  
Old January 26th, 2010, 16:02
pacoton pacoton is offline
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Default Re: valvula IAC

y cuando arrancas la camioneta se acelera?

el mio es tbi 4.3 yo te puedo ayudar con aportes solo pregunta

casi me se de todo de mi camioneta


saludos
  #6  
Old January 26th, 2010, 16:04
pacoton pacoton is offline
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Default Re: valvula IAC

como te comento el sensor de temperatura regula las revoluciones (se acelera cuando esta frio el refrigerante) y el pulso de inyeccion
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