YAMAHA GRIZZLY 700 Bad Fuel Injector
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
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86%
CONF
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Fuel Injector Assembly
The fuel injector uses an internal electromagnetic solenoid to lift a pintle valve against spring pressure. Over time, fuel lacquer or microscopic contaminants obstruct the micro-orifices or seize the pintle, preventing the 40+ PSI fuel from atomizing into the intake. This results in a failure to start or a lean-misfire condition even when the ECU is correctly grounding the circuit.
SKU: 3B4-13761-00-00
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8%
CONF
|
Fuel System Relay
This relay provides the 12V positive 'prime' to both the fuel pump and the fuel injector. In the Grizzly 700, internal contact oxidation or pitting within the relay causes high resistance, leading to a significant voltage drop. While the relay may audibly 'click,' it fails to deliver the current necessary to energize the injector solenoid, mimicking a mechanical injector failure.
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|
|
6%
CONF
|
Fuel Pump Assembly
The EFI system requires a precise pressure (approx. 43.5 PSI) to overcome the injector's internal spring tension and ensure atomization. If the pump's internal motor or pressure regulator fails, the fuel pressure drops below the 'cracking pressure' of the injector. This results in the injector failing to spray fuel into the cylinder despite receiving the proper electrical signals from the ECU.
SKU: 3B4-13907-11-00
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DIY Repair Guide
Watch exactly how to replace the Fuel Injector Assembly.
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