Question about 1991 Chevrolet K1500

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Egr valve what is the orifice washer size?

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  • hpancoast Sep 28, 2008

    what is the washer size for the oriface on the EGR valve?

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I am changing mine, and the original doesnt have washers

Posted on Nov 14, 2014

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A matter of interest why do you want to know what size the orifice is as if you take the egr valve off some don,t have a gasket some do but they cannot be altered the are standard fittings if i know why i may be able to help you with what it is you are after yates210456

Posted on Sep 28, 2008

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Code P1405


I have copied the entire description for the code.
Let me know if you need more info. You may need a shop to take a look at the system.

P1405 Ford Description
The purpose of the Exhaust Gas Recirculation (EGR) system on your engine is to limit oxides of nitrogen (NOx) emissions. This is done by redirecting small amounts of exhaust gas back through the upper intake to get mixed in with the air/fuel charge. The resultant diluted air/fuel mixture (i.e., less oxygen per cubic foot) burns cooler and combustion chamber temperatures are reduced accordingly, thereby lowering NOx emissions.
The Ford DPFE/EGR system is controlled by the Powertrain Control Module (PCM). The system employs an EGR Valve, an Electronic Vacuum Regulator (EVR), and a Delta Pressure Feedback EGR sensor (DPFE).
The DPFE Sensor measures EGR flow across an orifice located inside the special EGR Tube. The orifice is positioned between two hose ports coming off the tube which are connected to the DPFE sensor with special heat-resistant hoses. When the EGR Valve is open, a pressure differential is created across the orifice (intake manifold pressure vs. exhaust pressure). By design, this difference in pressure is measured by the DPFE sensor in terms of voltage. The DPFE voltage signal output to the PCM is directly proportional to the flow of exhaust gas entering the intake manifold.

Read more: http://engine-codes.com/p1405_ford.html#ixzz2dUIwIiDd

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