1996 Ford Taurus 96 Taurus 3.0 6 cylender problem

Tiny
CDOG0809
  • MEMBER
  • 1996 FORD TAURUS
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 181,544 MILES
On my car after I let it set for about 20 to 30 min. And start it up it adles past 2000 rpm it takes about 5 or 10 min to go down to 950 to 1000 rpm when it's in drive it idles at 900 rpm in park it idles at 1000 rpm it will go up a slight hill by itself I was told it could be the I a c v or the t p s but it idles at the normal rpm

please help charles
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Wednesday, February 18th, 2009 AT 11:36 PM

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Tiny
DAVE H
  • EXPERT
IDLE SPEED
Idle Air Control (IAC) Valve Assembly
IAC valve assembly is used to control idle speed and provide a dashpot function. IAC valve assembly meters inlet air around the throttle plate through a by-pass within the IAC valve assembly and throttle body. See Fig. 6 .
The PCM determines desired idle speed or air by-pass and signals the IAC valve assembly through specified duty cycle. The IAC solenoid is built into IAC valve assembly. IAC solenoid responds by positioning the IAC valve to control amount of air by-passed. PCM monitors engine speed and adjusts IAC duty cycle to achieve desired RPM.
Fig. 6: Cross-Sectional View Of IAC Valve Assembly Components
Courtesy of FORD MOTOR CO.


http://www.2carpros.com/forum/automotive_pictures/266999_iac_5.jpg

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Thursday, February 19th, 2009 AT 9:29 AM
Tiny
CDOG0809
  • MEMBER
I was told that it could not be the iac valve because it idles at the normal rpm after it idles down if I could send some one an video of what the car does in drive and iin park
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Thursday, February 19th, 2009 AT 8:10 PM
Tiny
DAVE H
  • EXPERT
Throttle Position (TP) Sensor
TP sensor is a rotary potentiometer. TP sensor monitors throttle plate opening. Its signal to the PCM is proportional to throttle plate opening angle and rate of angle change. The TP sensor signal affects air/fuel ratio, injector timing, idle speed, EGR flow and ignition timing. The TP sensor is mounted on throttle body, at throttle plate rod.

Mass Airflow (MAF) Sensor
MAF sensor uses a hot wire sensing element to measure amount of air entering the engine. Air passing over the hot wire causes it to cool. The hot wire is maintained at 392 F (200 C) above ambient temperature, as measure by a constant cold wire.
The current required to maintain hot wire operating temperature is proportional to the intake air mass. The PCM calculates the fuel injector pulse width in order to provide the desired air/fuel ratio.
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Friday, February 20th, 2009 AT 7:41 AM

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