...on my 1993 toyota corolla dx with a 4 cylinder 1.8L engine
EGR stands for EXHAUST GAS RECIRCULATION.
This is a loop back system between your exhaust manifold and the underside of your filter.
The EGR valve is located between the inlet (exhaust manifold) and the outlet (intake manifold).
About 8-12" below the air filter....toward the passenger side.
EGR carbon built up can be clean.
Check the soft membrane on the EGR valve and see is it crack/torn. If it's in good shape then you may reuse it.
The professional use a vacuum hand tool to determine the travel of the EGR.
There are carbon built up inside the EGR air passage tube too,
Make sure you give both a good cleaning.
The EGR base gasket MUST BE REPLACE!
Order one before you start the job.
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