The Relay Fast Idle Q-Control 5 Pins 12V for Isuzu NPR, NQR, and NRR trucks with 4BD2 and 4HK1 engines is an essential component that regulates the engine’s idle speed electronically. It ensures smooth operation during cold starts, heavy loads, or air conditioning use.
This fast idle relay (also known as Q-control relay) delivers quick response, long service life, and reliable performance in all conditions. Built with premium-grade materials and designed to meet OEM standards, it fits perfectly into your Isuzu’s electrical system, providing stable voltage and consistent control over idle RPM.
Ideal for truck owners, fleet maintenance, and diesel engine technicians looking for a dependable replacement relay to restore or maintain optimal idle performance.
🔹 Key Features:
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5-pin 12V fast idle Q-control relay for Isuzu diesel engines
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Designed for Isuzu NPR, NQR, and NRR series
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Compatible with 4BD2 and 4HK1 engines
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Controls idle speed electronically for smooth performance
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Ensures proper function during cold starts or AC load
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OEM-standard fit and long-lasting build
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Quick installation and reliable electrical connection
🔹 Compatibility:
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Vehicle Models: Isuzu NPR, NQR, NRR
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Engine Models: 4BD2, 4HK1
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Voltage: 12V DC
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Pins: 5
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Applications: Idle speed control relay (Q-Control), fuel system regulation
🔹 Why Choose This Product:
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Genuine OEM-standard relay for Isuzu trucks
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Enhances idle stability and fuel efficiency
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Built for durability under heat and vibration
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Easy to install and plug directly into stock harness
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Tested for performance and reliability
Frequently Asked Questions (FAQ)
What does the Fast Idle Q-Control Relay do in an Isuzu engine?
It controls the engine’s idle speed electronically, especially during cold starts or when additional electrical loads are applied.
Which Isuzu models are compatible with this relay?
This relay fits Isuzu NPR, NQR, and NRR models equipped with 4BD2 or 4HK1 diesel engines.
How many pins does the relay have?
This relay comes with 5 pins for proper Q-control connection and stable operation.
Is it a 12V relay?
Yes, this is a 12-volt relay designed for Isuzu’s 12V electrical systems.
Can I install this relay myself?
Yes, it can be installed easily, but for best results, professional installation is recommended to ensure correct wiring.
What are the signs of a faulty fast idle relay?
Common signs include unstable idle speed, poor cold starts, and erratic RPM when electrical loads are applied.
Relay Fast Iddle Q-Control 5 Pins 12 V | Isuzu NPR/NQR/NRR 4BD2/4HK1
OE Replacement: Not Available
Fits Following: NPR NQR NRR 4BD2 3.9L / 4HK1
Year: 1994-2009
