Question about 1990 Ford Econoline

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After sitting, hard to start, seems not to be getting fuel. you can spray starting fluid and it starts, must run at higher than normal idle for a few minutes, then will idle normally.

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  • 3 more comments 
  • john hardy Aug 01, 2010

    Sorry, it's a 4.9L auto, does that help a bit? thanks

  • john hardy Aug 01, 2010

    duane, can you tell me how to pull up the illustrations mentioned? thnx

  • john hardy Aug 01, 2010

    I don't see an x anywhere.

  • john hardy Aug 01, 2010

    Ya, there is no x in a box, or an icon. You tried to help, thnx for your time anyway

  • john hardy Aug 01, 2010

    thnx duane, I'll either buy a manual or visit the library, you tried, can't ask for anymore than that

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  • Ford Master
  • 6,826 Answers

OPERATION The Idle Air Control (IAC) valve controls the engine idle speed and dashpot functions. The valve is located on the throttle body on. This valve allows air to bypass the throttle plate. The amount of air is determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal. Fig. 1: Cleanable IAC valve — 5.0L engine version shown, others similar After sitting, hard to start - 88484g22.gif
Fig. 2: Non-cleanable IAC valve — 5.0L engine version shown, others similar 88484g23.gif
next.gif TESTING OBD-I System

  1. Make sure the ignition key is OFF.
  2. Disconnect the air control valve.
  3. Use an ohmmeter to measure the resistance between the terminals of the valve solenoid. NOTE: Due to the diode in the solenoid, place the ohmmeter positive lead on the VPWR pin and the negative lead on the ISC pin.
  4. If the resistance is not 7–13 ohms, replace the air control valve.
---
REMOVAL & INSTALLATION Fig. 1: Idle air control valve mounting — 4.9L engine version shown, others similar 88484g10.gif
  1. Disconnect the negative battery cable.
  2. Disconnect the engine wiring to the IAC sensor.
  3. Remove the two retaining screws for the valve.
  4. Remove the IAC valve and discard of the old After sitting, hard to start - 88485p12.jpg Fig. 2: Disengage the idle air control solenoid electrical connection
    Fig. 3: Loosen the idle control solenoid retaining screws 88484p08.jpg
    Fig. 4: Remove the idle air control solenoid from the throttle body 88484p09.jpg
    To install:
  5. Clean the area of old gasket material.
  6. Using a new gasket, attach the IAC valve to the engine. Tighten the retaining screws to 71–102 inch lbs. (8–12 Nm).
  7. Connect the IAC valve wiring to the unit.
  8. Connect the negative battery cable.
prev.gif next.gif

Posted on Aug 01, 2010

Testimonial: "Very fast reply, and understandable. Only problem, how do I pull up illustrations?"

  • 1 more comment 
  • Duane Wong
    Duane Wong Aug 01, 2010

    Try to click on the (x).

  • Duane Wong
    Duane Wong Aug 01, 2010

    I'm sorry, but on my screen it shows an x in a box for each illustration. I am not sure what you see at your end, though.



    But, if there is an 'icon' where a picture belongs, try to click on it.



    Sometimes it works and sometimes it doesn't from feeback that I've gotten back.



    Sometimes it's hard to upload all of the information from my online resource to Fixya.com.

    But, I tried.

  • Duane Wong
    Duane Wong Aug 01, 2010

    You could try to buy the Chilton's or Hayne's manual for it which would have illustrations in it.

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