Question about 1989 Toyota Pickup SR5

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Idle air control valve screw came out 1989 toyota pickup

I have a 1989 toyota pickup. The IACV screw came out. WHat can I do to fix this?

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  • Toyota Master
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If you have the screw and the little spring around it just screw it back in. If it is lost then go to the wreckers or carby repair shop and get another screw and spring. screw it all the way in until it touches then unscrew it 2 full turns . That will get it started and then adjust in or out until the engine idles smoothly.

Posted on Dec 28, 2013

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Posted on Jan 02, 2017

  • 199 Answers

SOURCE: need to locate toyota aurion/camry iac valve

the MAF sensor is between the air filter and throttle body. the idle controll is at the throttle body.  Its located on the throttle body on the left side. Follow the air intake to an intake manifold which sits on top of the throttle body. 

Posted on Jan 05, 2009

keithheavili
  • 410 Answers

SOURCE: Trying to locate the idle air control valve on Toyota Sienna Van

You idle air control valve should be located on the throttle body.  Here is a link to a picture of it so you can see what you are looking for:  http://www.autozone.com/autozone/catalog/parts/partsShelf.jsp?categoryDisplayName=Engine+Management&fromType=parts&fromString=search&parentId=cat30067&currentPage=1&filterByKeyWord=IAC&isSearchByPartNumber=false&navValue=15900207&categoryNValue=15999999&fromWhere=&itemId=prod61721&displayName=Idle+Air+Control+Valve&searchText=IAC Let me know if you have any other questions.  Thanks for rating my response and for using FixYa!

Posted on May 28, 2009

reisdos
  • 1297 Answers

SOURCE: I have a 2004 Toyota Corolla and my check engine

P0505 is correct, but replacing the IAC won't help if the PCM cannot control and/or monitor the operation

you need to measure voltage at the IAC and/or the signal return to the PCM

Posted on Apr 13, 2010

SOURCE: My 1991 toyota celica GT

You will need to replace the faulty idle air control valve (IAC) This is a very common and well known problem on Toyota vehicles. Click on the link below to view the replecement part needed:

http://cgi.ebay.com/ebaymotors/SMP-IAC-VALVE-AC139-TOYOTA-CELICA-COROLLA-_W0QQcmdZViewItemQQfitsZYearQ3a1991Q7cMakeQ3aToyotaQ7cModelQ3aCelicaQQhashZitem53e4a2973dQQitemZ360318146365QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

Posted on Jan 12, 2011

SOURCE: 2001 toyota echo engine light is on. Car idle is rough and sometimes stalls. Is there a way to clean the idle air control valve without removing it?

Yes, I just had the same problem and I cleaned it with STP throttle body and carb cleaner. Take off the air big air hose off of the throttle body. You will see a small hole on the lower right side. Put the spray nasal on your cleaner can. Stick the plastic nasal directly into the hold and spray it for about 7 seconds. Then take the nasal off of the can and stick it in the hole pushing it in and out for a few minutes. Then put nasal back on the can and spray for another 7 seconds. Now wait for 20 minutes. spray one last time for a few seconds and you are good to go. You will be shocked on how much better you echo will run. I almost spent 225.00 for a new idle control valve, man I sure am glad I did this. My car is running better now then when I first bought it. Good Luck !!

Posted on Apr 26, 2013

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IACV screw came out. What can I do to fix this?


no photo , no joy.
which screw, a mounting screw, some have mounts and calibr. screws.
the mount ? remove the other screw, go to any hardware store or auto store and match it, hint its metric. as them for help.
diameter and pitch and lenght must match.
or any toy dealer. show screw, he matches it.

Dec 27, 2013 | 1989 Toyota Pickup SR5

Tip

Idle Air Speed Control valve on engines



1.4) IACV Idle Air Control Valve - Idle Speed Control Unit(actuator)

What is it? The idle air control valve is an electrically driven mechanism that allows additional control over the throttle at idle.

Where is it located? The IACV is located on or near to the throttle body and consists of a small device with an electrical connector.

How does it work? When the throttle is closed the throttle plate closes offair from the inlet manifold and normally this would cause the engine to stall immediately. To allow the engine to keep running the ECU makes use of the IACV system to permit the ingress of a limited amount of air. The IACV device is seen in two forms either a) a small motor driven valve on a passageway allowing air indirectly to pass to the inlet manifold plenum or b) a motor located on theTPS assembly that opens the throttle plate by a small degree to allow air through directly. Both systems are designed to allow air to by-pass the 'closed' throttle plate to maintain engine idle. The IAC also helps throttle respond to additional power demands being made on the engine such as using the power steering, air conditioning or moving the (automatic) transmission selector into 'drive'. Somecar manufacturers also have a separate 'hot idle' valve system and this is designed to operate for a relatively short period just during engine warm up. Such hot idle systems are accompanied by electrically driven IAC valves to maintain engine idle in the face of additional power demands.

Symptoms of faulty IACV
Associated OBD2 error codesDTCs: P1508, P1509

  • Poor starting, sudden stall: If the IACV fails to open or the inlet/exit ports are clogged shut with oily deposits the engine may ignite and then promptly stall. The engine can be kept running by pressing the accelerator. However any additional demand on the engine such as power steering or putting the car into drive (automatic) will cause the engine to stumble badly or stall.
  • Engine stall at stop sign: Even with the engine is warmed up, if the car comes to a halt such as a stop light the engine may stall. The engine will often restart immediately with little trouble

Thisdiffers from:-
a) TPS fault - engine stall when theaccelerator is depressed quickly, but will often restart without much trouble.
b) CKP or CMP fault - engine cuts out without warning and is resistant torestart until cooled down

How to check? Physically remove the IACV, keep the electrical connection and examine the state of the valve for carbon build up. Blank off the exposed IACV port(s) on the throttle body and turn the engine on; you may have to give it extra throttle until the engine has warmed up. Monitor the IACV valve movement in response to additional loads (power steering inputs etc) the valve should open and close according to demand. When refitted this action results change in engine speed in response to increased power demand.

The electrical connector to the IACV can have 2 or 4 pins:-
2pins: resistance between socket pins should about 10 OHMS +/- 3 OHMS. If this resistance is very high then there is break and the IACV is at fault.
4pins: resistance between diagonally positioned pins should be about 20 OHMS. If the resistance is very high this indicates that the IACV is faulty.

Resistance between the actual metal valve body and either of the socket pins should be greater than 10,000 OHMS. If there is little or no resistance thenthere is a short and the IACV is faulty.

How to fix? If the motor of the IACV has failed (no movement and fault resistance values) then replace it. If the valve is gummed closed by baked oil and carbon then clean it thoroughly with WD40 or carburettor/choke cleaner spray and a cloth. Similarly if the entry and exit ports on the throttle body to the IACV look dirty again clean them out thoroughly.


NEXT 1.5) TAC Throttle Actuator Control

on Jul 15, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

How do i adjust idle for 1989 toyota camry


Its not exactly adjustable, its controlled by the computer by using the idle air control valve.
If the idle speed is too high, you may have a vac leak, or the idle air control valve may be faulty.

Sep 22, 2012 | 1989 Toyota Camry

1 Answer

Car has in a fuel injected 1500 cc engine ,hard to start and uneven idle usually jump from 1500 to 3000 rpms when it should be idling


You probably have a bad Idle Air Control Valve (IACV). If it does not control the idle correctly , you can find yourself driving 50 MPH with out touching the gas pedal. The IACV is located on the throttle control valve and is typically held on by two or three small screws. The price for an IACV can run from $25 to $500. I purchased a throttle body for $40 , removed the IACV, and saved $400.

Dec 19, 2010 | Mitsubishi Lancer Cars & Trucks

2 Answers

I have a 93 honda del sol manual when the car has been turned on it accelerates by itself and it has a check engine light dont now what is wrong with it


You probably have a bad Idle Air Control Valve (IACV). In fuel injected carburetors when the throttle valve is closed the IACV opens and closes to control the idle speed. If it malfunctions the engine may rev up allowing the car if in gear to accelerate on its own . When I had a bad IACV in my Mitsubishi Lancer it would drive down the road at 50 mph with out touching the gas pedal. Fortunately, it could be slowed down by using the brakes (unlike the Toyota stories).

Nov 07, 2010 | Honda del Sol Cars & Trucks

2 Answers

Idle fluxuates up and down consistantly


Check the Idle Control System

Idle speed is controlled by the Idle Air Control Valve (IACV). The IACV changes the amount of air being bypassed to the intake manifold, in response to electric current controlled by the ECM. When the IACV is activated, the valve opens to maintain proper idle speed.

Symptom and Subsystems to Check:

1. Difficult to start engine, when cold--check Fast Idle Thermo Valve.

2. Fast idle out of spec, when cold:
a. Check Fast Idle Thermo Valve.
b. Check IACV.
c. Check idle adjusting screw (see Section C).

3. Rough idle:
a. Check hoses and connections.
b. Check IACV.

4. RPM too high, when warm:
a. Check IACV.
b. Check Fast Idle Thermo Valve.
c. Check hoses and connections, check Power Steering Pressure Switch Signal, and check idle adjusting screw.

5. RPM too low, when warm:
a. Idle speed is below specified rpm, with no load--check IACV and idle adjusting screw.
b. Idle speed doesn't increase after initial start up--check IACV.
c. Idle speed drops in gear (automatic transmission)--check automatic transaxle gear position switch signal.
d. Idle speed drops when AC is on--check air conditioning signal and IACV.
e. Idle speed drops when steering wheel is turned--check power steering pressure switch signal and IACV.
f. Idle speed fluctuates with electrical load--check hoses and connections, IACV, and Alternator FR Signal.

6. Frequent stalling, while warming up--check IACV and idle adjusting screw.

7. Frequent stalling, after warming up--check idle adjusting screw and IACV.

Additional Steps:

. Check Alternator FR Signal. Have alternator inspected, if idle speed fluctuates with electrical load. The FR signal communicates to the ECM how "hard" the alternator is working to meet the electrical demands of the car, including the battery and any loads which aren't monitored by the ELD. This square-wave signal varies in pulse width, according to the load on the alternator. The ECM places, approximately, 5 reference volts on the wire. The voltage regulator will drop this signal to approximately 1.2 volts, in proportion to alternator load. The ECM compares the electrical load (ELD) signal with the FR (Charging Rate) signal from the alternator and uses that information to set the idle speed and turn the alternator on and off. This helps fuel economy.

. Clean main ECM ground on thermostat housing.

. Reset ECM, by removing the 7.5 amp Back Up Fuse, in the under-hood fuse box, for 10 seconds.

. Replace PCV Valve, cleaning hose with brake cleaner spray.

. Substitute a known-good ECM. If symptom goes away, replace original ECM.

Check the ICM (Erratic RPM and PGM-FI System)

When the engine is cold, the air conditioner compressor is on, the transmission is in gear (automatic transmission only) or the alternator is charging, the ECM controls current to the Idle Air Control (IAC) Valve to maintain correct idle speed. Here's an overview of how the PGM-FI System works.

Background:

Various inputs to the ECM are TDC/CKP/CYP Sensor, MAP Sensor, ECT Sensor, IAT Sensor, TP Sensor, HO2S, VSS, BARO Sensor, EGR Valve Lift Sensor, Starter Signal, Alternator FR Signal, Air Conditioning Signal, Automatic Transmission Shift Position Signal, Battery Voltage (Ignition 1) Brake Switch Signal, PSP Switch Signal, ELD, and VTEC Pressure Switch.

Inputs are received and processed by the ECM's Fuel Injector Timing and Duration, Electronic Idle Control, Other Control Functions, Ignition Timing Control, and ECM Back-up Functions. These are the primary functional areas within the ECM.

Outputs from the ECM control Fuel Injectors, PGM-FI Main Relay (Fuel Pump), MIL (Check Engine Light), Idle Air Control (IAC) Valve, A/C Compressor Clutch Relay, Ignition Control Module (ICM), EVAP Purge Control Solenoid Valve, HO2S Heater, EGR Control Solenoid Valve, Alternator, Lock-up Solenoid Valve A/B (A/T), VTEC Solenoid Valve, and Interlock Control Unit.

Idle RPM:

Once you understand how the PGM-FI system is configured, it's easy to see how the ECM, Idle Air Control Valve, and the Ignition Control Module affect idle rpm. If the ECM's Electronic Idle Control function is not working properly, then it cannot properly control the IAC Valve. Likewise, if the ECM's Ignition Timing Control function is not operating properly, it cannot properly control the ICM (igniter). Obviously, idle rpm will also be affected if there's a problem with the IAC Valve or the ICM. As stated above, the ECM controls current to the Idle Air Control (IAC) Valve to maintain correct idle speed. This cannot happen if the IAC Valve is failing. The same situation exists if the ICM is failing. The ECM will tell the ICM to open and close the primary voltage circuit going to the coil and it won't respond properly. The result will be erratic spark plug firing and erratic rpm.

Conclusion:

If you are experiencing erratic idle rpm, try and isolate whether the problem is caused by the ICM (ignitor), IAC Valve, or the ECM. My experience has been that a failing ICM is usually responsible for the problem. Keep in mind that tachometers are connected directly to the ICM. Therefore, a fluctuating tachometer needle is often a dead giveaway. Heat and poor preventive maintenance (causing high secondary voltage to be discharge on internal distributor components) frequently causes the ICM (and coil) to fail. Besides performance, this is another reason why it's important to regularly replace spark plugs, spark plug wires, rotors, and distributor caps. Electricity will always follow the path of least resistance, even if it isn't the intended one. Our job is to ensure the intended path is the path of least resistance.

Ignitor (ICM) and Coil Replacement:

1. Disconnect negative battery cable.
2. Remove hex head machine screws, securing distributor cap to housing, using an 8 mm nut driver.
3. Move distributor cap and wires off to the side.
4. Remove machine screw securing rotor to shaft, using a #2 Phillips head screwdriver. It may be necessary to "hit" the starter once or twice, in order to rotate rotor for access to mounting screw.
5. Remove rotor and leak cover.
6. Unfasten ignitor wires, remove coil mounting screws, and set coil aside. Note: Removing coil first improves access to igniter.
7. Unfasten screws securing igniter to housing.
8. Remove ignitor from distributor and unfasten screws mounting ignitor to heat sink.
9. Coat back of new ignitor (or old igniter, if reusing) and male connectors with silicone grease. Silicone grease increases heat transfer to heat sink. Failure to apply silicone grease will cause the ignitor to quickly fail.
10. Mount ignitor to heat sink and reinstall ignitor, igniter terminal wires, coil, coil wires, leak cover, rotor, and distributor cap. Ensure female ignitor terminals fit snugly--crimp with pliers, if necessary.

AutoZone can test ICMs and coils for free. If you plan to keep the car, I would replace the ICM due the age of your Civic.

Sep 15, 2010 | 1991 Honda Civic

1 Answer

Idling problem toyota altis


Either there is a vacuum leak causing the high idle, or
the IACV is bad or being controlled by the computer to make idle speed too high:

To change the IACV refer to the following:
Idle Speed Control (Idle Air Control) Valve Removal & Installation To Remove:
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove the throttle body. Idle speed control valve toy_cor-04-18-1187.gif

  3. Remove the 3 mounting screws from the throttle body. Remove the idle speed control valve and gasket.
To Install:
  1. Using a new gasket install the idle speed control valve on the throttle body with the 3 mounting screws.
    • Tighten 33 inch lbs. (3.7 Nm).
  2. Install the throttle body.
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Jul 16, 2010 | 2004 Toyota Corolla

1 Answer

My 89 honda accord lxi with the 2.0 won't idle correctly, it idles up and down and when you first start it up in the morning it idles about 2500 rpm or higher.


air in the IACV (idle air control valve) coolant line - air bubbles in the coolant will confuse the iacv into incorrect idle settings.....even when hot, and a fault in this unit will do the same thing, very very common fault in a honda.

Jan 13, 2010 | 1989 Honda Accord 4 Door

1 Answer

I have a 1989 accord lxi with 130000mi. the idle started fluctuating from 700-1600 rpm when the engine is warm and has been driven a while, sometimes i can get it to stop by reving the engine. i cleaned...


generally cleaning the idle air control valve does not fix the problem, because the dirt or carbon deposits causing the problem is not were you can see it. It usually is in the valve stem and housing and you cant get it clean like it needs to be. Replace your idle air control valve and this will fix your problem

Oct 11, 2009 | 1989 Honda Accord 4 Door

1 Answer

My 89 toyota pickup 22re fuel injected serges when idling when its warmed up


The Idle Air Control Valve (IACV) may need cleaning or replacement.

This valve lets air bypass the throttle plate so that the engine can idle. The more air, the faster the idle. If this valve is sticky, the computer may have a hard time regulating the idle properly and may surge.

Oct 09, 2009 | 1989 Toyota Pickup SR5

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