Keep your engine's vacuum-controlled emission components switching on cue with the Standard Ignition Ported Vacuum Switch PVS91. A ported vacuum switch senses engine temperature and routes the ported vacuum signal to temperature-dependent devices such as the distributor vacuum advance and EGR system, so the right components see vacuum only when the engine reaches the intended temperature. This one installs as a direct-fit replacement across a broad range of 1976-1988 Nissan models, including the 200SX, 300ZX, 310, 510, 610, 620, 710, 720, 810, B210, D21, F10, Maxima, Pathfinder, Pulsar NX, Sentra, Stanza and Van — see the "Vehicles it fits" section for the full year-by-year list.
Signs the switch may need replacing include a vacuum signal that reaches its device at the wrong temperature, a stored vacuum-related code, or driveability issues tied to advance or EGR operation. If a failed ported vacuum switch is the cause, this replaces it — diagnose the vacuum circuit first to confirm.
Interchange: Manufacturer part number PVS91.
Product information is for general reference and may contain errors. See our Disclaimer.
What does a ported vacuum switch do?
It senses engine temperature and routes the ported vacuum signal to temperature-dependent devices, such as the distributor vacuum advance or EGR system, so they receive vacuum only at the intended temperature.
Will the PVS91 fit my vehicle?
It is a direct-fit replacement for many 1976-1988 Nissan models, including the 200SX, 300ZX, 510, 720, Maxima, Pathfinder, Sentra and more. Check the "Vehicles it fits" section for the full list.
What are signs this switch may need replacing?
A vacuum signal that reaches its device at the wrong temperature, a stored vacuum-related trouble code, or driveability issues tied to vacuum advance or EGR operation can all point to the switch.
Does the D21 and Sentra share the same year coverage?
No. The D21 is listed for 1986-1987, while the Sentra is covered for 1983-1985 and again for 1987. Confirm your exact year in the "Vehicles it fits" section.
What is the manufacturer part number?
This is Standard Ignition Ported Vacuum Switch, manufacturer part number PVS91.
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Standard Motor Products
Standard Motor Products
Standard Motor Products
Standard Motor Products
Standard Motor Products
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
