Question about 2004 Mazda 6

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My mazda 6 2004 motor 2.3, when is a low speed, sounds as detonation. We did change the knock sensor , but it persists. What can i do?

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  • jutdaz Oct 21, 2008

    did it get louder or knock faster as you excelorated?

  • fernandezchr Nov 18, 2008

    Yeah. I have the same problem, I can noticed it when the engine is warm, on drive and much louder when A/c is on. According to scheduled manual, at 75k miles if its noisy, get valve clearance adjustment?



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Change the gasoline to 95% octane, check the fuel reel and injectors..

Posted on Aug 06, 2008


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Mazda 3 2007 engine noise

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could be a big end or main bearing but there are a few simple checks that can be done first
1--have the oil pressure checked using a mechanical gauge
if there is a bad bearing there will be low pressure at idle
2 --check the exhaust for smoke under load
if there is a bad bearing , the escaping oil will overload the oil ring and produce smoke
( if smoke comes after idling at lights and on taking off that is valve stem seals)
3--- run the fault codes and check for knock sensor problems
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4---check the ignition timing
5-- run the engine when it is knocking and remove a plug wire and see if the knocking stops
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Too far advanced will cause the pistons to slap the cylinder walls hard for too far advanced ignition
you statement that the noise goes after 40 indicates that it is not a bearing as the high the rpm the louder the noise
taking the foot off the pedal indicates detonation
lastly if all the checks prove good , you could always have the sump removed and check each big end and main individually for damage
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