Question about 1999 Mazda 626
PROBABLY CLOGGED PASSAGES
Posted on Nov 19, 2008
Do you see if the manifold was cracked? usually the problem is not just the egr valve it has a modulator it is either electronic or vacum controlled, now the right way to check or the first thing to do is if there is vacum at the valve and from there check to see if there is vacum at the egr valve only wheren you rev the engine aroun 2000 to 2500 rpm , but i suggest you not to rev the engine at this rate too long if the valve opens thne the next thing to do is remove the valve and makd sure that the egr port is not clogged up with carbon if it is plugged up you can just knock them off using a small screw driver or such and clean the passage with a wire brush and put the valve back always make sure that you put it back using a new egr valve gasket.
regarding the noise make sure that all other tubing that go from the exhaust manifold is not broken it is not just the muffler that is involved in the exhaust sys that keeps the noise down!!!
Posted on Nov 14, 2008
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Posted on Jan 02, 2017
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