Acura Integra 1985-1989 Emissions & Sensor Bolt Torque Specifications
Detailed torque specifications for bolts securing various emissions sensors on the 1985-1989 Acura Integra, including oxygen, EGR, and other related sensors.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
Always use a calibrated torque wrench and follow specifications exactly.
Incorrect Torque Sequence
Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
Clean and inspect all threads before assembly. Use new thread locker if specified.
Reusing TTY Bolts
Torque-to-yield bolts are designed to stretch and must not be reused.
Always replace TTY bolts with new ones. They are single-use only.
Dry vs. Lubricated
Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
Torque Wrench Care
- Calibrate annually or after 5,000 clicks
- Store at lowest setting
- Keep clean and lubricated
Search Specifications
Search by component name, bolt size, or description
Torque Calculator
Convert between different torque units
Egr System
The EGR system reduces nitrogen oxide (NOx) emissions by recirculating a portion of exhaust gases back into the combustion chamber. Proper torque ensures secure mounting and prevents exhaust leaks.
1 EGR Valve Bolts
M8 x 1.25
EGR Valve Bolts
M8 x 1.25Torque Value
Important Notes
Exhaust Manifold System
The exhaust manifold collects exhaust gases from the engine cylinders and directs them to the exhaust system. Proper torque ensures a tight seal, preventing leaks that could affect emissions sensor readings.
1 Exhaust Manifold/Headers Bolts
M8 x 1.25
Exhaust Manifold/Headers Bolts
M8 x 1.25Torque Value
Important Notes
2 Exhaust Manifold/Headers to Cylinder Head Bolts
M8 x 1.25
Exhaust Manifold/Headers to Cylinder Head Bolts
M8 x 1.25Torque Value
Important Notes
Exhaust Pipe System
The exhaust pipe system connects the exhaust manifold to the catalytic converter and other downstream components. Proper torque ensures a tight seal, preventing leaks that could affect emissions sensor readings.
1 Exhaust Pipe to Exhaust Manifold/Headers Bolts
M8 x 1.25
Exhaust Pipe to Exhaust Manifold/Headers Bolts
M8 x 1.25Torque Value
Important Notes
2 Catalytic Converter to Exhaust Pipe Bolts
M8 x 1.25
Catalytic Converter to Exhaust Pipe Bolts
M8 x 1.25Torque Value
Important Notes
Throttle Body System
The throttle body controls air intake into the engine, which directly affects the air-fuel ratio and emissions. Proper torque ensures secure mounting and prevents air leaks.
1 Throttle Body Bolts
M6 x 1.0
Throttle Body Bolts
M6 x 1.0Torque Value
Important Notes
Emissions Sensors
Emissions sensors monitor exhaust gases to ensure compliance with emissions standards. Proper torque ensures secure mounting and accurate readings.
1 Oxygen Sensor (O2 Sensor) Mounting Nut
M12 x 1.5
Oxygen Sensor (O2 Sensor) Mounting Nut
M12 x 1.5Torque Value
Important Notes
2 Exhaust Gas Temperature Sensor Bolt
M6 x 1.0
Exhaust Gas Temperature Sensor Bolt
M6 x 1.0Torque Value
Important Notes
Heat Shield System
Heat shields protect components like the catalytic converter from excessive heat. Proper torque ensures secure mounting and prevents rattling or damage.
1 Catalytic Converter Heat Shield Bolts
M6 x 1.0
Catalytic Converter Heat Shield Bolts
M6 x 1.0Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Loose Components
Symptoms:
- Rattling or vibration noises
- Visible movement in components
- Uneven panel gaps
Solutions:
- Clean threads and mounting surfaces
- Replace damaged fasteners
- Apply proper torque in sequence
- Use thread locker if specified
Stripped Fasteners
Symptoms:
- Unable to achieve proper torque
- Fastener spins freely
- Visible thread damage
Solutions:
- Use thread repair kit if appropriate
- Install thread insert (HeliCoil)
- Replace component if threaded hole is damaged
- Upgrade to higher grade fastener if recommended
Overtightened Components
Symptoms:
- Cracked or deformed parts
- Broken fasteners
- Compressed gaskets or seals
Solutions:
- Replace damaged components
- Use new fasteners
- Follow proper torque sequence
- Verify correct torque specifications
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Visual Inspection
Inspect the affected area for any visible signs of damage or wear
- Check for cracks or deformation
- Look for signs of excessive wear
- Verify proper fastener installation
Torque Verification
Verify the torque applied to the fasteners
- Check the torque wrench calibration
- Verify the torque specification
- Compare the applied torque to the specification
Thread Assessment
Assess the condition of the threads
- Check for signs of thread damage
- Verify the thread type and size
- Check for proper thread engagement
Prevention Guidelines
Best practices, maintenance tips, tool care
Prevention Guidelines
Best practices, maintenance tips, tool care
Best Practices
- Always follow the recommended torque specification
- Use the correct type and size of fasteners
- Verify the torque wrench calibration regularly
Maintenance Tips
- Regularly inspect the affected area for signs of wear or damage
- Replace damaged or worn-out components promptly
- Keep the work area clean and organized
Tool Care
- Regularly clean and maintain the torque wrench
- Store the torque wrench in a dry and secure location
- Verify the torque wrench calibration before each use
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 Why is it important to use the correct torque specifications for emission sensors?
Why is it important to use the correct torque specifications for emission sensors?
Using the correct torque specifications ensures a proper seal and prevents damage to the sensor and the engine components. Overtightening can crush gaskets, strip threads, or damage the sensor itself, while undertightening can lead to leaks, causing inaccurate readings and potential emissions control failures. For example, an undertorqued oxygen sensor might allow exhaust gases to escape, affecting its readings and triggering a check engine light. A crushed gasket from overtightening can cause vacuum leaks.
Q2 Can I reuse the gaskets for emission sensors?
Can I reuse the gaskets for emission sensors?
It's generally recommended to replace gaskets when removing emission sensors, even if they appear to be in good condition. Old gaskets can become brittle and may not create a proper seal once reinstalled, potentially leading to leaks. For example, when replacing an EGR valve, installing a new EGR valve gasket is highly recommended to avoid leaks.
Q3 What happens if I overtighten a sensor's mounting bolt?
What happens if I overtighten a sensor's mounting bolt?
Overtightening can damage the threads in the sensor housing or the engine component, potentially requiring costly repairs. Additionally, it can crush gaskets, leading to leaks and faulty readings from the sensor. For example, overtightening the bolt of a MAP sensor can crack the sensor's plastic housing, damaging the sensor itself.
Q4 Where can I find the torque specs if I don't have the service manual?
Where can I find the torque specs if I don't have the service manual?
While a service manual is the ideal source, you can find torque specs in some online forums specific to 1985-1989 Acura Integras, or from a reputable automotive database. However, always verify the specifications from multiple sources, and when in doubt consult the specific manufacturer manual. Generic torque guides may not apply in every case.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature can significantly impact torque values and fastener behavior
Cold Weather
Effects:
- Increased material brittleness
- Higher torque required due to thread contraction
- Reduced thread lubricant effectiveness
Recommendations:
- Allow components to warm to room temperature when possible
- Consider using winter-grade thread lubricants
- Check torque values more frequently during winter months
Hot Weather
Effects:
- Thermal expansion of components
- Decreased friction in threads
- Accelerated lubricant breakdown
Recommendations:
- Check torque when components are at normal operating temperature
- Use temperature-resistant thread lockers
- Consider re-torquing after heat cycles
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Moisture and corrosion can affect fastener integrity and torque values
High Humidity
Effects:
- Accelerated corrosion formation
- Reduced friction coefficient
- Potential thread seizing
Prevention:
- Use corrosion-resistant fasteners
- Apply appropriate anti-seize compounds
- Maintain proper protective coatings
Salt Exposure
Effects:
- Rapid corrosion development
- Thread damage
- Seized fasteners
Prevention:
- Regular underbody washing
- Use of sacrificial anodes where appropriate
- Application of protective coatings
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Spring
- Inspect for winter damage
- Clean and protect exposed fasteners
- Check torque on critical components
Summer
- Monitor heat-affected components
- Check expansion-related loosening
- Inspect cooling system mounts
Fall
- Prepare for winter conditions
- Apply corrosion protection
- Verify all fasteners are properly torqued
Winter
- More frequent inspection of critical fasteners
- Check for salt damage
- Monitor suspension component torque
Related Resources
Tools, service procedures, and technical bulletins
Recommended Tools
Torque Wrench (1/4-inch drive)
A calibrated torque wrench is essential for achieving proper bolt tightness, preventing damage and leaks.
- Accurate torque measurement in inch-pounds or Newton-meters
- Click-type mechanism for precise torque application
Socket Set (1/4-inch drive)
A socket set with various sizes is required to fit different emissions sensor bolts and fasteners. Specifically, a 10mm socket is commonly needed.
- Various metric sizes
- 6-point sockets for improved grip
Extension Bar (1/4-inch drive)
An extension bar is useful for reaching sensors in confined spaces or hard to reach locations.
- Allows for access to recessed bolts
- Adds leverage when needed
Service Procedures
Oxygen Sensor Removal and Installation
This procedure details the removal and installation of the oxygen sensor, including proper torque application.
- Locate the oxygen sensor(s) on the exhaust manifold or exhaust pipe.
- Disconnect the electrical connector from the sensor.
- Use the appropriate socket to remove the sensor from the exhaust system.
- Clean the threads of the new sensor and the exhaust port.
- Install the new sensor by hand until snug.
- Using the torque wrench and the correct socket, torque the sensor to 33 ft-lb (45Nm) unless otherwise specified.
- Reconnect the electrical connector.
- Start the car and verify there are no leaks.
EGR Valve Removal and Installation
This procedure outlines the steps to remove and install the EGR valve, ensuring proper bolt tightening.
- Locate the EGR valve on the intake manifold or cylinder head.
- Disconnect any vacuum hoses and electrical connectors attached to the valve.
- Use the appropriate socket to remove the mounting bolts.
- Carefully remove the old valve and clean mounting surfaces.
- Position the new EGR valve and install mounting bolts by hand.
- Using the torque wrench and the correct socket, torque the EGR valve mounting bolts to 16 ft-lb (22 Nm).
- Reconnect all vacuum hoses and electrical connectors.
- Start the vehicle and check for any vacuum leaks.
Manifold Air Pressure (MAP) Sensor Removal and Installation
This procedure covers the removal and installation of the MAP sensor, focusing on proper tightening to prevent vacuum leaks.
- Locate the MAP sensor, typically on the intake manifold or firewall.
- Disconnect the electrical connector from the sensor.
- Remove the sensor mounting screws or bolts.
- Carefully remove the old sensor and inspect the seal.
- Install the new MAP sensor and mounting screws.
- Using the torque wrench and the correct socket, torque the mounting screws to 8 ft-lb (11 Nm).
- Reconnect the electrical connector.
- Start the vehicle to ensure proper sensor function
Technical Service Bulletins
Oxygen Sensor Connector Corrosion
1988-05-15Some 1986-1988 Integra models may experience corrosion on the oxygen sensor electrical connector leading to intermittent sensor failure. This bulletin provides inspection and repair details.
Resolution: Inspect oxygen sensor connector for corrosion. Clean the contacts, or replace the connector and sensor as needed.
EGR Valve Clogging Issues
1987-11-201985-1987 Integra models may experience issues with excessive carbon build-up in the EGR valve, causing poor performance. Recommended actions are listed below.
Resolution: Inspect and clean the EGR valve and passages. If cleaning is ineffective, replace the EGR valve and its gasket.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.