AutoCodes – Acura – P1078 Acura

P1078 Acura Code - Intake Manifold Runner Control System Malfunction High RPM

Quick Answer

Engine power is achieved by closing and opening the Intake Manifold Runner Control (IMRC) valve. Common causes include Faulty Intake Manifold Runner Control (IMRC) Valve, IMRC Valve harness is open or shorted, IMRC Valve circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1078 Acura indicates Intake Manifold Runner Control System Malfunction High RPM.
Common causes: Common causes include Faulty Intake Manifold Runner Control (IMRC) Valve, IMRC Valve harness is open or shorted, IMRC Valve circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 39,108

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 07, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1078 Acura Description

Engine power is achieved by closing and opening the Intake Manifold Runner Control (IMRC) valve. When the valve is closed, there is high torque at low engine speed. When the valve is open, there is high torque a high engine speed.

OBDII Code P1078 Acura - Intake Manifold Runner Control System Malfunction High RPM - AutoCodes.com — P1078 Acura Code - Intake Manifold Runner Control System Malfunction High RPM

What does this mean?

What are the Possible Causes of the DTC P1078 Acura?

Faulty Intake Manifold Runner Control (IMRC) Valve
IMRC Valve harness is open or shorted
IMRC Valve circuit poor electrical connection

How to Fix the DTC P1078 Acura?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1078 Acura code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1078 Acura Code

1. What are common symptoms of OBDII code P1078 in an Acura related to the Intake Manifold Runner Control System?

Symptoms may include rough idling, decreased engine performance, reduced fuel efficiency, and the illumination of the Check Engine light.

2. What are potential causes of the P1078 code in an Acura?

Potential causes include a faulty intake manifold runner control valve, a vacuum leak in the intake system, damaged wiring or connectors, or a malfunctioning PCM (Powertrain Control Module).

3. How can I diagnose the cause of the Intake Manifold Runner Control System malfunction in my Acura?

A thorough inspection of the intake manifold runner control valve, vacuum lines, wiring, and connectors is recommended. Additionally, using an OBDII scanner to retrieve freeze frame data can help pinpoint the issue.

4. Is it safe to continue driving my Acura with the P1078 code present?

It is not recommended to continue driving with the P1078 code present, as it can lead to further engine damage and reduced performance. It is best to address the issue promptly.

5. Can I repair the Intake Manifold Runner Control System malfunction in my Acura myself?

Depending on your mechanical skills and access to tools, you may be able to address simpler causes like a vacuum leak or damaged wiring yourself. However, more complex issues may require professional assistance.

6. How much does it typically cost to repair the P1078 code related to the Intake Manifold Runner Control System in an Acura?

The cost of repair can vary depending on the root cause of the issue. Simple fixes like replacing a faulty valve or repairing a vacuum leak may cost a few hundred dollars, while more extensive repairs could cost upwards of a thousand dollars.

7. Will resetting the Check Engine light make the P1078 code go away permanently?

Resetting the Check Engine light without addressing the underlying issue will not make the P1078 code disappear permanently. The issue must be diagnosed and repaired to prevent the code from returning.

8. Can a clogged intake manifold cause the P1078 code in an Acura?

While a clogged intake manifold may not directly cause the P1078 code, it can contribute to issues with the Intake Manifold Runner Control System, leading to related malfunctions and triggering the code.

9. How long does it typically take to repair the Intake Manifold Runner Control System malfunction in an Acura?

The repair time can vary depending on the specific cause of the issue and the complexity of the repair. Simple fixes may take a few hours, while more involved repairs could take a day or more.

10. Are there any preventive measures to avoid encountering the P1078 code in the future?

Regular maintenance, including checking and cleaning the intake manifold runner control system components, inspecting vacuum lines, and addressing any engine performance issues promptly, can help prevent the recurrence of the P1078 code in the future.