Ugly Sound At High Rpm

[markdem]

just wondering what that horrid sound is at high rpm. from about 6000rpm onward (around the same time the engine starts coming down from its power peak) , the engine no longer makes a nice purring sound but instead sounds like its rattling. like v-tec or something kicks in lol. valve bounce??? no its not my coils

[r32line]

Might help if you at least said what car you have, mods etc? Your questions is pretty vague so the answers will be vague also

[markdem]

r32gtst

big turbo 15psi

fmic

injectors

ems

exhaust

supersparks

[skylinesandman]

sounds like its pingin dude usually a timing problem

change ya timin belt and check ya timin maybe ??

[mad082]

as above, most likely pining which is either caused by too much timing or not enough fuel. could be a sign that the fuel pump is dying.

another possibility is that the exhaust gasket is gone or there is a broken manifold stud

[skylinesandman]

^^^

[ARTZ]

r32gtst

big turbo 15psi

fmic

injectors

ems

exhaust

supersparks

Is EmS engine management system

pinging off its head...haha...

dont bother fixing it you probably f**ked it already

I dont know what vtec you have driven but mine sounds f**king awesome when it kicks in..highly tuned and finely balanced engine on 8000+ revs, since when does that sound bad..

[markdem]

dont think its the exhaust gasket. i had that before and its like a tractor, mostly heard at low rpms

could be ping but its unlikely. i adjusted the timing too far a couple times and i quickly figured out what it sounds like.

i guess ill try backing off bost and then backing off timing to see if its any of those

[markdem]

i checked the compression. one cylinder is down to 110psi which probably means that ugly sound at high rpm is a misfire. rebuild time! who wants a rebuild thread with lots of pictures???