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Discussion Starter · #1 ·
Dealer can't help so I turn to the experts....... Strange noise coming from engine at 3400 rpm. It stops about 3600 rpm. I 've never heard 4 cylinder detonation to know what it sounds like only V-8's. I put some octane booster in to see if it would stop. Waste of $6.00. It does it at all throttle positions, when hot, when cold, etc. I have a 2003 Type-S with AEM cold air, Greddy Evo exhaust and a Hondata reflash. Anyone have any ideas. IT'S DRIVING ME CRAZY!!!!!:mad:
 

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Don't know - hard to say from your description.......I have no engine mods, I did have some knocking a few months ago. I added some octane booster, and it went away. Been using 89 octane gas ever since (K20A3, a/k/a base).

:dontknow:

Recommendation - find a good Honda specialist - independent - shop in your area. Or a Honda geek that lives near you.
 

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Discussion Starter · #7 ·
it sounds almost like a drummer hitting a symbol really fast with both sticks. not that high pitched and ringing though. hard to describe. i run 93 octane and even adding octane booster didn't help. it only makes the noise from 3400 to 3600 rpm. no check engine light either. i was kind of thinking it was something resonating at that rpm range but god it could be anything. it just started out of the blue, not after any mods were done. anyway, if anyone has had this problem or has any idea's i would be greatful. thanks guys and girls.
 

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I've been in an S that was detonating before and the CEL would flicker. That car had Kpro, so don't know if that's something that is set-up thru kpro or not. Check heatshields, and exhaust bolts.
 

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Check engine mounts as well.

I would be surprised if it's detonation.

If u can here it then it should be bad enought to throw a CEL.
 
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