3858963 Volvo Throttle Body | Genuine Used Part

🔧 Product Description

Genuine Volvo Penta GM EFI Throttle Body - Part Number: 3858963

A genuine Volvo Penta throttle-body assembly for selected GM-based 4.3L, 5.0L and 5.7L electronic-fuel-injection petrol marine engines. The body meters intake air and supports the throttle plate, shaft and related sensors used by the engine-control module.

⚙️ Key Features

• Genuine Volvo Penta OEM throttle body
• Correct Volvo Penta part number 3858963
• Used on selected 4.3L V6 and 5.0L / 5.7L V8 EFI engines
• Compatible with Gi, GXi, Fi and OSi intake systems where specified
• Original marine-calibrated throttle bore and linkage

🚤 Compatibility

Commonly used on

• Volvo Penta GM-based multi-port and throttle-body fuel-injection systems
• Petrol sterndrive and inboard intake assemblies

Typically suits

• Engine models:
• Volvo Penta 4.3Gi
• Volvo Penta 4.3GXi
• Volvo Penta 5.0Fi
• Volvo Penta 5.0Gi
• Volvo Penta 5.0GXi
• Volvo Penta 5.7Gi
• Volvo Penta 5.7GXi
• Volvo Penta 5.7GXi-E
• Volvo Penta 5.7OSi
• Volvo Penta PMDM / FMDM EFI engine families using 3858963
• GM-based 4.3L, 5.0L and 5.7L applications whose intake diagram specifies 3858963
• Engine Size: 4.3L, 5.0L and 5.7L
• Engine Type: Volvo Penta GM V6 / V8 EFI petrol sterndrive and inboard engine
• Year Range: Approximately mid-1990s to mid-2000s

🔌 Function

The throttle body controls intake-air volume in response to the helm throttle. The ECM uses throttle position with manifold-pressure and engine-speed data to manage fuel injection, ignition timing and idle control.

⚠️ Common Signs of Failure

• Sticking throttle plate
• High, low or unstable idle
• Hesitation under acceleration
• Throttle-position sensor fault
• Idle-air-control fault
• Vacuum leakage from shaft wear or gasket failure

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 3858963 current / final Volvo Penta body reference for the applicable EFI system

OEM / Related Numbers

• 3858963
• 3843750 related throttle-body casting / assembly reference
• 3868144 related EFI component reference
• Volvo Penta throttle-position sensor and idle-air-control valve references
• GM marine EFI intake-manifold gasket references

Aftermarket / Verified Equivalents

• General Motors: corresponding marine EFI throttle-body casting 3843750 where matched by casting and sensor configuration
• No direct bolt-on aftermarket marine-calibrated equivalent

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated