Question about 1999 Mazda 626

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2000 mazda 626 engine light is on took it to the dealer found an egr valve problem they "fix" it light went on again took it back they check it found that the manifold was bad "fix" it again turned off the light for 20 min the car was fine after that light came on again and is making a really bad noise like if the muffler was bad but its not the muffler what can it be???

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Posted on Nov 19, 2008

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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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