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{{ImportedFrom|site=Xenonzcar|title=Z31 EGR Valve|url= | {{ImportedFrom|site=Xenonzcar|title=Z31 EGR Valve|url=https://z31library.com/xenonzcar_archive/z31/SENSORS/egrvalve.php.html|archive=https://z31library.com/xenonzcar_archive/z31/SENSORS/egrvalve.php.html|fetched=2026-05-15}} | ||
== Z31 EGR Valve == | == Z31 EGR Valve == | ||
https://z31library.com/xenonzcar_archive/z31/SENSORS/egrvalve.jpg | |||
The '''EGR Control Valve''' controls the volume of exhaust gas led into the intake manifold through a vertical movement of a taper valve connected to a diaphragm that receives vacuum in response to the opening of the throttle. The chart below will explain when the EGR valve is opened. | The '''EGR Control Valve''' controls the volume of exhaust gas led into the intake manifold through a vertical movement of a taper valve connected to a diaphragm that receives vacuum in response to the opening of the throttle. The chart below will explain when the EGR valve is opened. | ||
| Line 17: | Line 17: | ||
The signal from the '''ECCS control unit''' is sent to the EGR control solenoid valve, which cuts the vacuum line for the EGR control valve when any of the following conditions are met: | The signal from the '''ECCS control unit''' is sent to the EGR control solenoid valve, which cuts the vacuum line for the EGR control valve when any of the following conditions are met: | ||
| Condition Present | {| class="wikitable" | ||
|- | ! Condition Present | ||
| Engine Starting | On | Does Not Function | | ! EGR Control Solenoid Position | ||
| Throttle Valve Switch Open | | ! EGR System Operation | ||
| Low Engine Temperature | | |- | ||
| | | Engine Starting | ||
Engine Speed Below 900 RPM Above 3200 RPM | | rowspan="4" | On | ||
| | | rowspan="4" | Does Not Function | ||
| Except Above | Off | Operates | | |- | ||
! colspan="3" style="text-align:left" | Throttle Valve Switch Open | |||
|- | |||
! colspan="3" style="text-align:left" | Low Engine Temperature | |||
|- | |||
! colspan="3" style="text-align:left" | Engine Speed<br />Below 900 RPM<br />Above 3200 RPM | |||
|- | |||
| Except Above | |||
| Off | |||
| Operates | |||
|} | |||
=== Diagnosis === | === Diagnosis === | ||
https://z31library.com/xenonzcar_archive/z31/images/Sensors/egrcheckthumb.jpg | |||
=== Installation === | === Installation === | ||
https://z31library.com/xenonzcar_archive/z31/SENSORS/egrvalveinstallation.jpg | |||
'''Installation Tip:''' When installing the EGR valve and its guide tube, take care to ensure the port is pointing toward the rear of the engine. This positioning is crucial for optimal distribution efficiency of the exhaust gases into the intake manifold. | '''Installation Tip:''' When installing the EGR valve and its guide tube, take care to ensure the port is pointing toward the rear of the engine. This positioning is crucial for optimal distribution efficiency of the exhaust gases into the intake manifold. | ||
=== Sources Used === | |||
* [https://z31library.com/xenonzcar_archive/z31/z31fsm.php 1984-1988 Nissan 300ZX Factory Service Manual] | |||
[[Category:Imported from Xenonzcar]] | [[Category:Imported from Xenonzcar]] | ||
Latest revision as of 22:53, 20 October 2026
Imported page. This page was converted from an archived copy of "Z31 EGR Valve" (Xenonzcar, fetched 2026-05-15). The conversion was mechanical, so tables, links and formatting may contain conversion artefacts. Compare against the archived copy if something looks wrong. The content belongs to its original authors.
Z31 EGR Valve[edit]
The EGR Control Valve controls the volume of exhaust gas led into the intake manifold through a vertical movement of a taper valve connected to a diaphragm that receives vacuum in response to the opening of the throttle. The chart below will explain when the EGR valve is opened.
In the Exhaust Gas Recirculation System, some of the exhaust gas is returned to the combustion chamber to lower the flame temperature during combustion. This results in a reduction of nitrogen oxide (NOx) density in the exhaust gas.
When the EGR Control Valve is open, some of the exhaust gas is led from the exhaust manifold to the EGR tube. The exhaust gas is then regulated by the EGR valve and introduced into the intake manifold.
WARNING - Do this modification at your own risk. We Are not responsable for any issues of your own doing.
Exhaust Gas Recirculation (EGR) System Operation[edit]
The signal from the ECCS control unit is sent to the EGR control solenoid valve, which cuts the vacuum line for the EGR control valve when any of the following conditions are met:
| Condition Present | EGR Control Solenoid Position | EGR System Operation |
|---|---|---|
| Engine Starting | On | Does Not Function |
| Throttle Valve Switch Open | ||
| Low Engine Temperature | ||
| Engine Speed Below 900 RPM Above 3200 RPM | ||
| Except Above | Off | Operates |
Diagnosis[edit]
Installation[edit]
Installation Tip: When installing the EGR valve and its guide tube, take care to ensure the port is pointing toward the rear of the engine. This positioning is crucial for optimal distribution efficiency of the exhaust gases into the intake manifold.