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How do i find the orifice washer selection for my Erg valve on my Gm motor

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EGR valve?
Any autopart store.

Posted on Nov 16, 2014

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Posted on Jan 02, 2017

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You engine is TBI, It uses a MAP sensor check the vacuum line for crack and make sure yo have a good seal, The distributor also check and make sure the pick up does not have corrosion which causes the relutor to stick. As for the EGR it would cause a misfire, and yes the do fail. I am sticking with the IAC as a problem its a stepper motor and has a high failure rate, chack also the ECT (engine coolant temp sensor) for corrosion that gives false reading.

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Erg flow insufficient


  • The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
  • There is a blockage in the EGR (tube), most likely carbon buildup
  • The EGR valve is faulty
  • The EGR valve may not be opening due to a lack of vaccuum
It is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
  • Clean out the EGR valve and/or tubing to remove deposits
  • Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
  • Replace the DPFE sensor (with a good quality / OEM one)
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The EGR valve is located in the engine compartment. Its should look this

2_7_2012_10_25_48_pm.jpg

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Hello: Starting in 2000 some GM cars/trucks no longer have a PCV valve, they have a fixed orifice which needs to be checked and kept clean. It will be located in the valve cover(s)

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How to tell if my erg valve is bad on my 2003 impala running slugish


gm are bad about carbon buildup on the valve take off and clean.free up valve make sure that it seats if stuck open it will cause a big vacuum leak

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1 Answer

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ERG or EGR valve?. well if you dont mind the check light coming on and the engine to run like **** in the future, you might want to change it, espcially if you live in an emission state, they wont pass you part if failling.

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2 Answers

Egr valve


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

Sep 28, 2008 | 1991 Chevrolet K1500

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