Question about Ford E-150

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Testing power & diode to idle air control valve ford e 150 1988

Satarts fine but starts load'n up when it idles down

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: cannot find idle air control valve

3.0 and 3.8 engines are next to the throttle body [throttle cable hooks to it] and is bolted down with two 5/16 head bolts,is about three inchs long and 1 1/2 round

Posted on Jan 17, 2009

  • 72 Answers

SOURCE: ford freestar, idle is wierd,

try a tune up

Posted on Jun 11, 2009

  • 7353 Answers

SOURCE: rough idle up and down 1988 ford bronco

Try discoonecting the battery for a few minutes, and then reconnect and drive it, it may have to "relearn" proper idle speed.

Posted on Nov 06, 2009

  • 171 Answers

SOURCE: 1985 ford F150 is running very rich. (choke is

When you say it's destroying the air filter---do you mean it's all sooted up ?? I am assuming that what you mean.
Try disconnecting the vacuum line at the egr valve and see if that helps.
But it sounds more like a plugged up exhaust system.Try disconnecting or looosing the flange before the cataylic convertor and then see how it runs.

Posted on Nov 20, 2009

  • 40 Answers

SOURCE: idle air control valve

Any auto supply store will sell cleaners in spray cans for that purpose, also clean electrical contacts with electrical cleaner for that purpose, good luck

Posted on Feb 17, 2012

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1994 ford escort wagon lx 4cyl standard won't idle, dies at stops. Had idle throttle sensor and throttle sensor replaced. Doesn't help even though when coded it said that was the problem. Help!


The DTC - diagnostic trouble code may have had the word IAC - idle air control etc.... that doesn't mean the valve is bad . The IAC has electrical circuits associated with it . There could be an open circuit , short to ground , short to power etc.... The Idle air control passage could be plugged . How To Fix Car That Idles Poorly Clean the IAC
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The most common causes for "idle hunt" is a dirty throttle body or faulty idle air control valve. The computer uses the control valve to regulate idle speed.
There could also be a vac leak somewhere.

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Engine idles fine till you turn on a.c. then slow & shakes badly


Hello good sir or mam

So here is goes when you turn on your ac system you put a harder load on you engine as it engages the ac compressor clutch. That being said if you are low on freon your ac compressor will be harder to turn as refrigerant contains oil for your system too.

You may also want to check your serpentine belt as a worn belt will cause this to look for frays,cracks,or a depth Gage. also you may need a tune up check your spark plugs,igniton coil, and or distributor cap & rotor if applicable older models.

You may also need to replace your idle air control valve as it can definatlly cause this

well i hope it helps if so please leave 4 thumbs up

May 15, 2011 | Ford Escort Cars & Trucks

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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.


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 88484g22.gif
Fig. 2: Non-cleanable IAC valve — 5.0L engine version shown, others similar 88484g23.gif
prev.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 gasket. Fig. 2: Disengage the idle air control solenoid electrical connection 88485p12.jpg
    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

Aug 01, 2010 | 1990 Ford Econoline

1 Answer

F250 won't idle properly.


idle air control valve or
idle air control motor is possible

same thing but diff parts stores call it diff name

Jun 26, 2009 | 2000 Ford F250 Super Duty Crew Cabs

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1999 f150 4x4 , p1506


P1506 Idle Air Control Overspeed Error


The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the side of the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed.


TESTING PROCEDURE


  1. Turn the ignition switch to the OFF position.
  2. Disconnect the wiring harness from the IAC valve.
  3. Measure the resistance between the terminals of the valve.

Due to the diode in the solenoid, place the ohmmeter positive lead on the emphasis type="medium" VPWR/emphasis terminal and the negative lead on the emphasis type="medium" ISC/emphasis terminal.
  1. Resistance should be 6-13 ohms.
  2. If resistance is not within specification, the valve may be faulty.
Please rate and god bless:)

Apr 25, 2009 | 1999 Ford F150 Regular Cab

2 Answers

High idle speed on 1987 ford F150


it may be this or the ( pcv valve ) pcv get clogged alot on old fords.The idle air control valve (IAC) control the engine idle speed and dashpot functions. The valve is located on the throttlebody . 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.

TESTING
  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.
Due to the diode in the solenoid, place the ohmmeter positive lead on the VPWR pin and the negative lead on the ISC pin.
  1. If the resistance is not 7-13 ohms replace the air control valve.

Feb 18, 2009 | 1987 Ford F 150

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