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Ask Your Question2000 Mazda 626
Question: EGR Valve: cleaning vs. replacement
Question
My check engine light is on, and the code it returns is for the EGR valve. The AutoZone computer tells me this:
EGR system fault
The ECM has detected too little flow on the EGR System.
The AutoZone person told me that the valve needs replacement.
The dealership mechanics told me that replacing it would be a waste of money, and that the system only needs decarbonization. Would cleaning the system be enough to turn off the Engine light (and therefore pass inspection)? Thanks for the help!
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Answer #1
patrick mannion from Greg Solow's Engine Room, March 15, 2009, 18:13
MasterIt is most likely carbon build up in the intake manifold that is causing the problem not a defective EGR valve. Lots of Mazdas have had this problem of clogging up the passageways. Get it properly diagnosed by someone familiar with Mazda before just replacing the valve.
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Reply
Visitor, September 16, 2010, 05:34Replymy 626 runs fine except for the egr valve cause a very slight ping after car is at regula temperature. Does this indicticate clogged passageways or a bad egr valve?
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