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Q:How can you check if the EGR is working right and were is it located on a 92 ranger
A:If the EGR is not working, it would cause a vaccum leak, leading to inefficient combustion, very high idling, hesitation and sometimes stalling in extreme cases. The Exhaust Gas Recirculation (EGR) valve is located at the right rear corner of the intake manifold, near the firewall.
A:The EGR valve can be tested by using a hand held vacuum pump! With the engine idling remove the EGR vacuum hose and attach the vacuum pump to the EGR and slowly pump the vacuum pump the engine should immediately stall or run VERY rough! This test both the EGR diaphram (and it's ability to open the EGR and will also tell if the EGR passages are restricted! As far as the location, You did not mention which engine option that your Ranger has!
Q:if it tests good can the egr still be bad from not sealing or weak spring
A:What kind of test are you doing on the EGR valve.