Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSACURA1994INTEGRA (GS-R) L4-1797CC 1.8L DOHC (VTEC)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSVARIABLE VALVE TIMING SOLENOIDDESCRIPTION AND OPERATION
1994 Acura Integra (GS-R) L4-1797cc 1.8L DOHC (VTEC)
Variable Valve Timing Solenoid: Description and Operation
1994 Acura Integra (GS-R) L4-1797cc 1.8L DOHC (VTEC)SECTION Description and Operation
VTEC - Valve Train:
VTEC - System Description:
DESCRIPTION
The Variable Valve Timing Solenoid opens and closes a oil passage leading to the rocker arm assembly, allowing engine oil to pressurize the locking pins in the intake rocker arms.
OPERATION
When the proper conditions have been met, the Engine Control Module (ECM) signals the solenoid valve to open by applying battery voltage. The open valve allows engine oil at operating pressure to enter the rocker arm assembly and move pins located in the primary, secondary and middle rocker arms, locking them together. The middle rocker follows a high lift and duration lobe. Once locked together, both intake valves open and close in response to this high performance cam lobe profile.
CONSTRUCTION
An electromagnetically activated spool valve in a cast aluminum housing.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.