Question about 2000 Mazda 626
Hello, Your EGR valve is located on the side of your intake manifold. It allows exaust gasses to pass into the engines intake manifold to reduce engine emissions at higher engine speeds. Normally these valves are tested during smog checks and some times fail. The test is usually done with the engine running and the vaccumn line to the EGR valve removed and plugged. The tester attaches a vaccumn line with a vaccumn pump on it and start to pump vaccumn to the line the engine will then start to run bad and shake if the valve is working correctly. If this does not happen then several things could be wrong. The valve is defective and not opening. This can be tested with the engine off and watching the diaphram stem to see if it moves when vaccumn is applied. and stays while vaccumn is applied the the valve is operating properly and the exhaust end of the valve may need to be cleaned. Normally this is where the problem lies, but some times the ports ger really clogged up and need to be cleaned. This means that you are going to have to take some of the motor apart to facilitate the cleaning. You can first start by blowing some air thru the ports to see if they flow air and are open. The one that usually gets plugged is the one on the intake side that fees under the carburator or fuel injection ports. It gets plugged up from fuel and exhaust residue over the years. I have had good results cleaning the ports with Chemtool B-12 cleaner. It usually breaks the blockage down so it can be cleaned out. If you are mechanically inclined you can make the repairs yourself. It may or will require some disassembly of the intake/exhaust system of the vehicle and the purchase of gaskets and seals. Always disconnect the battery negative cable before working on the vehicle for safety reasons. Good Luck, RAC
Posted on Apr 18, 2009
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Posted on Jan 02, 2017
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