Question about 2000 Ford Taurus

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There is a vacuum port on the air passage way right after the MAS. What does this vacuum port connect too

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The best thing to do is google for a vaccum diagram and click images and it will show you all your vaccum lines

Posted on May 20, 2011

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Stalls while in drive with foot on brake , changed MAP Sensor, Crank Shaft Sensor , Distributor, Fuel Pump, Fuel Filter , have ran out of ideas


I would check the IAC motor or idle air control motor, heres a little info.about the part.Stratus Sedan, 1999-2005 Idle Air Control Motor

Print


Description & Operation

Not for Dodge Stratus Sedan
The idle air control motor (IAC) attaches to the throttle body. It is an electric stepper motor. The PCM adjusts engine idle speed through the idle air control motor to compensate for engine load, coolant temperature or barometric pressure changes. The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the air bypass passage and regulates airflow through it.
The PCM adjusts engine idle speed by moving the IAC motor pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning).

0996b43f8020234f.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig.

Not for Dodge Stratus Sedan
When engine rpm is above idle speed, the IAC is used for the following functions:


Off-idle dashpot Deceleration air flow control A/C compressor load control (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
The idle air control motor (IAC) attaches to the throttle body. It is an electric stepper motor. The PCM adjusts engine idle speed through the idle air control motor to compensate for engine load, coolant temperature or barometric pressure changes. The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the air bypass passage and regulates airflow through it.
The PCM adjusts engine idle speed by moving the IAC motor pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning).

21180_cdia_g257.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig.

When engine rpm is above idle speed, the IAC is used for the following functions:


Off-idle dashpot Deceleration air flow control A/C compressor load control (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
Target Idle
Target idle is determined by the following inputs:


Gear position ECT Sensor Battery voltage Ambient/Battery Temperature Sensor VSS TPS MAP Sensor
Target idle is determined by the following inputs:


Gear position ECT Sensor Battery voltage Ambient/Battery Temperature Sensor VSS TPS MAP Sensor


Removal & Installation

  1. Disconnect the negative battery cable.
  2. Disconnect the IAC electrical connector.
  3. Remove the IAC mounting screws.
  4. Remove the IAC.

To Install:
  1. Install the IAC to the throttle body.
  2. Tighten mounting screws to 5.1 Nm (45 inch lbs.) torque.
  3. Attach electrical connector to the IAC.
  4. Connect the negative battery cable.

    0996b43f80202350.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig.


  1. Disconnect the negative battery cable.
  2. Disconnect the IAC electrical connector.
  3. Remove the IAC mounting screws.
  4. Remove the IAC.

To Install:
  1. Install the IAC to the throttle body.
  2. Tighten mounting screws to 5.1 Nm (45 inch lbs.) torque.
  3. Attach electrical connector to the IAC.
  4. Connect the negative battery cable.

May 11, 2012 | 2000 Chrysler Cirrus

2 Answers

1988 F-150 4.9 six. Pulled codes and it showed egr valve was not closing. Changed egr valve and now when driving there is a miss when engine warms up. Did not have the miss before I changed egr valve.


Check to make sure you didn't accidentally loosen a spark plug wire or broke/disconnected a vacuum hose.

A trick you can try; spray WD40 around the area you were working in, and see if the idle changes. If the idle changes then the problem is associated with a vacuum leak in that area....look for loose/cracked vacuum line.

Mike...

Nov 20, 2009 | 1988 Ford F 150

3 Answers

EGR problem on 2001 Camry??


Replace filter in EGR Modulator located to the left of EGR valve.
How do you clean the intake port below the EGR valve?

Sep 30, 2009 | 2001 Toyota Camry Solara

2 Answers

Egr problem , 1997 mercury mountaineer 5 liter. egr system not a dpfe system, no egr tube, ports into the intake elbow. replaced egr valve egr postion sensor, checked the egr selonoid for resitance showed...


Check the passages under the airhorn. When carbon builds up the diagnostic blames the EGR for not opening and throws a code. Actually there is no flow to the EGR because the port is clogged and the diagnostic measures the flow after the EGR.

They really needed to have a sensor before and after the EGR. Also remember to disconnect the battery for 10 minutes to remove old info.

Sep 24, 2009 | 1997 Mercury Mountaineer

3 Answers

Check engine light on,obd code P0402 I can hear leaking air under neat


code should be for egr flow - air leak you hear could be egr pipe or tubing rusted out or broken

Sep 24, 2009 | 2001 Toyota Camry

3 Answers

Egr code put two new egr vlvs on it still get code


remove the egr valve take a piece of clothes rack or a tiny tiny screw driver carefully clean out carbon in the intake port hole on the intake.the carbon blocking off the egr valve.so it cant work properly.after cleaning carbon clean up the debris and go from there.

Jun 25, 2009 | 1997 Ford F150 Regular Cab

4 Answers

1996 Camery P0401


the EGR valve is clogged on the backpressure port, that is the small tube that you need to clean the EGR valve needs to be replaced unless you are sure that air can pass through with the egr valve opened.
The engine light needs to be reset it does not automatically turn off. In some cases if the egr valve is known to be good as well as the modulator there may be a problem with the vacuum switching valve(VSV) that controls the egr system and this vsv may need to be replaced.

Jun 08, 2009 | 1996 Toyota Camry

1 Answer

97 pathfinder hesitates bucks and stalls at lights, already put plugs distributer and mass air flow censor


Check throtle position sensor behind the TBI. Run mode 4 in the computer diagnostic checks to see what codes is giving.

By the way, if any of the sensors give a code, don't spend money replacing them. They are all inter related. If one fails you will get codes for the others also. What you really need to do is above suggestion and then trace the circuits for continuity. Am assuming you know how to run ECM codes in the computer. Eliminate codes one at a time, and re-run mode 4, until all codes have been eliminated.

If code 55 is in the computer. Replace the whole TBI. After 20 years of use, they appear to corrode inside. But try the below first in the interest of saving money.

You might want to remove the TBI. Don't disturb the pre heater underneath the TBI if is stuck to it.
Take choke cleaner (Pep Boys or Autozone) Carb and Choke Cleaner in yellow can. There is an opening in the pre heater for the Air Flow Sensor, liberally spray it with the plastic little nozzle attached to the can and ensure all the gook in the passage way is clean, spray until no more junk comes out. Remove mass air flow sensor from TBI before doing this. You don't want to damage it. Spray the passage way from MAFS side also. While you have the TBI off, look at the port for EGR VALVE see if its clogged up with Carbon. Clean them out you can remove the carbon by scraping with a phillips head or bladed screwdriver. Two holes leading to the EGR Valve. They are about 1/2 inch in diameter round holes. Flush with the carb cleaner. If you really want to do ir right, remove the EGR Valve, clean it also and check to make sure its working. If NG replace it. Your EGR valve might be getting stuck due to carbon in the open position thus letting to much air into the intake manifold thus cunking out. Or the EGR has a leak. Check with vacuum pump by attaching VP to EGR. It should hold steady with 20 - 30 vacuum on the EGR. If it does not hold, throw it away and buy a new one.

You mentioned you replaced the MAFS. Remove it again and look in the element. Is it Wet or Dry?
It should be dry. Don't touch it. If its wet, then your air passages are clogged in the TBI. While you have the TBI out, spray all the vacuum fittings with the carb cleaner ensure they are free of blockage. Replace everything back carefully. Your truck should idle at 850 rpms if its standard and 700 if its auto. + or - 50 rpms. 850 is ideal. Let me know what happens after all of that.

Last but not least. Check the hose to the PCV Valve, ensure is not cracked, if damage, replace the hose and replace the PCV Valve. Ensure all vacuum hoses have no leaks and are correctly routed, especially the EGR valve one. From the manifold connect hose to center vacuum port or bottom port on the Solenoid Cut off Valve. Connect port B (Middle one to the EGR Valve.) Connect Port A (top one) to the Air Filter Canister. With the car on there should be continuity between port C and and B. You can check that with the vacuum pump. Gun the engine and see if you get a momentarily reading on the gauge if yes the port is good. If NO the Cut off Solenoid is NG. Find a working one in junk shop they are $100 bucks at the dealer. (highway robbery) If you are in PA go to Harry's U pull it. 5 bucks, each take the vacuum pump so you can check it before buying. The suffer from corrosion in the ports. Hope this solves your problem. Good Luck!

Aug 07, 2008 | 1988 Nissan Pathfinder

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