Idle Air Control Solenoid Repair Costs
Below are the typical repair costs for Idle Air Control (IAC) solenoid services at our shop rate of $125/hour:
Basic Cleaning Service
Cost Range: $125-$187.50
Includes removal, thorough cleaning, and reinstallation of the IAC valve. Typically takes 1-1.5 hours of labor.
IAC Replacement - Domestic Vehicles
Cost Range: $200-$375
Includes:
- Labor: $125-$187.50 (1-1.5 hours)
- Parts: $75-$187.50 (varies by make/model)
IAC Replacement - Import Vehicles
Cost Range: $250-$450
Includes:
- Labor: $125-$187.50 (1-1.5 hours)
- Parts: $125-$262.50 (varies by make/model)
IAC Replacement - Luxury Vehicles
Cost Range: $375-$625
Includes:
- Labor: $187.50-$250 (1.5-2 hours)
- Parts: $187.50-$375 (varies by make/model)
Note: These are estimated costs. Final pricing may vary based on vehicle make, model, year, and any additional repairs needed. A detailed inspection will provide exact pricing.
Additional Costs to Consider:
- Diagnostic Fee: $125 (typically waived if repairs are performed)
- Throttle Body Cleaning: $75-$125 (recommended with IAC service)
- Additional parts if related components need replacement
Idle Air Control (IAC) Solenoid Repair Procedures
Rotary-Style IAC Valve
Tools needed:Socket set, screwdrivers, cleaning supplies, electrical contact cleaner
Repair steps:
- Locate the IAC valve on the throttle body
- Disconnect the negative battery terminal
- Unplug the electrical connector from the IAC valve
- Remove mounting screws (typically 2-3 screws)
- Carefully remove the IAC valve
- Clean the valve passages and pintle with throttle body cleaner
- Inspect O-rings for damage and replace if necessary
- Reinstall in reverse order
- Reset engine computer by disconnecting battery for 15 minutes
Pintle-Style IAC Valve
Tools needed:Socket set, screwdrivers, cleaning supplies, electrical contact cleaner
Repair steps:
- Locate the IAC valve (usually mounted on throttle body or intake manifold)
- Disconnect the negative battery terminal
- Unplug the electrical connector
- Remove mounting bolts (usually 2 bolts)
- Carefully extract the pintle and spring
- Clean carbon deposits from pintle and housing
- Replace gasket or O-ring
- Carefully reinstall spring and pintle
- Mount valve and reconnect electrical connector
- Reset computer by disconnecting battery for 15 minutes
Linear-Style IAC Valve
Tools needed:Socket set, screwdrivers, cleaning supplies, electrical contact cleaner
Repair steps:
- Locate the IAC valve on the throttle body
- Disconnect the negative battery terminal
- Remove air intake duct if necessary
- Unplug the electrical connector
- Remove mounting screws
- Clean valve body and passages thoroughly
- Inspect for worn components
- Replace gasket or O-ring
- Reinstall valve in reverse order
- Reset computer by disconnecting battery for 15 minutes
Important Notes:
- Always consult your vehicle's service manual for specific procedures
- Some IAC valves cannot be cleaned and must be replaced as a unit
- Use only approved cleaning solutions to prevent damage
- If cleaning doesn't resolve the issue, replacement may be necessary
- Some vehicles may require idle relearn procedure after repair
Warning: Improper repair or installation can result in poor engine performance or stalling. If you're unsure about performing these repairs, please consult a professional mechanic.
Understanding Idle Air Control Solenoids
AnIdle Air Control (IAC) Solenoidis a crucial engine management component that helps regulate engine idle speed by controlling the amount of air bypassing the throttle plate. Here are the main types and their functions:
1. Rotary Idle Air Control Solenoid
This type uses a rotating pintle or valve controlled by a stepper motor to regulate airflow. The rotary motion allows for precise control of the air bypass channel.
- Most common in older vehicles (1980s-1990s)
- Provides smooth idle control
- Generally more durable due to simple mechanical design
2. Linear Idle Air Control Solenoid
Uses a plunger that moves in and out linearly to control air passage. The movement is controlled by electromagnetic force.
- Found in many modern vehicles
- Faster response time
- More precise control over idle speed
3. PWM (Pulse Width Modulated) Idle Air Control Solenoid
This type uses rapid electrical pulses to control air flow. The duration and frequency of these pulses determine how much air passes through.
- Common in newer vehicles
- Highly accurate control
- Better fuel efficiency
4. Two-Wire Idle Air Control Solenoid
A simpler design using just two wires for operation. One wire receives power while the other connects to the engine control module.
- Basic but reliable design
- Easier to diagnose and repair
- Common in older domestic vehicles
5. Four-Wire Idle Air Control Solenoid
Uses four wires for more sophisticated control, typically incorporating a position sensor for feedback.
- More precise control
- Better adaptation to different conditions
- Common in modern vehicles
Note: Regardless of type, all IAC solenoids serve the same basic purpose: maintaining proper idle speed under varying engine conditions such as temperature changes, electrical load variations, and air conditioning operation.
Warning:A malfunctioning IAC solenoid can cause rough idling, stalling, and poor fuel economy. If you experience these symptoms, it's recommended to have your vehicle inspected by a qualified technician.
Common Failure Symptoms of the Idle Air Control Solenoid (IAC)
Idle Air Control (IAC) Solenoid: Signs of Failure & Maintenance Guide
Common Signs of IAC Solenoid Failure
Irregular Idle Speed: One of the most common symptoms is an erratic or fluctuating idle speed. Your engine may rev higher or lower than normal while idling.
Stalling: The engine may stall when coming to a stop or while idling, especially when the engine is cold or when turning on the A/C or other electrical accessories.
Rough Idle: You might notice vibrations or shakiness when the vehicle is stationary with the engine running.
Check Engine Light: A failing IAC solenoid often triggers the check engine light, usually with specific codes related to idle control issues.
Maintenance Schedule
Regular Inspection: The IAC solenoid should be inspected during routine maintenance, typically every 60,000-100,000 miles.
Cleaning Schedule: Professional cleaning is recommended every 50,000 miles or when symptoms of carbon buildup appear.
Replacement: There's no set replacement interval as IAC solenoids can last the vehicle's lifetime. However, replacement is typically needed between 80,000-120,000 miles if problems occur.
Preventative Maintenance Tips
- Keep the engine properly tuned
- Use quality fuel
- Address check engine lights promptly
- Have regular throttle body cleanings performed
Note: Specific maintenance intervals may vary by vehicle make and model. Consult your vehicle's manual or speak with our certified technicians for model-specific guidance.
How It Works
- Get a quote online or set-up a time to have your vehicle looked at.
- Pick time slots that work for you, easily, online.
- We will confirm appointments and send reminders.
- Our mechanics bring everything that is needed to you.
- All you have to do is provided a safe area for the work to be performed.
What we need from you
- A safe place to work on your vehicle
- No working on the side of busy roads
- No working on unstable or steep surfaces.
- We do not perform repairs during severe weather.
- Authorization from a property owner or management.
- Repair work done in a parking lot or at your requires permission.
- We do not do repairs in areas restricted by law.
Common Questions
Service Area
Our primary service area is greater Grand Rapids and includes Comstock Park, East Grand Rapids, Grandville, Kentwood, Walker, and Wyoming
Our secondary service area is provided by our Belding location and includes: Belding, Greenville, Ionia and the sorrounding areas.
Contact us if you have any questions about where we provide services.
