The 4JJ1 SCV Upgrade Kit replaces the earlier short-style suction control valve with the improved long-style design. Expect steadier fuel pressure, smoother idle and restored performance under load.
🤠 Keep Your 4JJ1 Running Strong
Switching to the long-style SCV stabilises rail pressure, smooths idle and brings back dependable power — ideal for work, touring and towing.
❓ Frequently Asked Questions
Q: What’s the difference between short and long style SCV?
A: Early beige short SCVs are more prone to sticking. The long turquoise style uses a longer body/nozzle for improved fuel pressure control and reliability.
Q: Do I need special tools?
A: Good quality sockets/Allen keys are fine. A scan tool is recommended to run the pump learn/reset after installation but isn't always required.
Q: Will this fix rough idle or limp mode?
A: Often, yes. Many 4JJ1 drivability complaints trace back to a worn or sticking SCV, especially on earlier short-style valves.
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