hi everyone i need some help, i have a my96 sti and it has i rattle at around 3-4k revs it does not make a sound on tick over but when revved it makes a rattle/knock between 3-4k revs and then fades out and is fine at top end revs. recently the cam belt snapped but being interference free engines i thought it couldnt damage anything?? dont know if that makes a difference or not though? any help is appreciated, thanks brad

 

3 to 4 k revs say on throttle not speeding up or slowing down you can hear it rattle???? yes thats prob bottom end my shells were knacked wen i took it apart as it had spun a bearing mine did it between 2.5 k and 3k revs and if you blip the throttle from under bonnet you can get it to do it too...sounds a bit like a diesel engine type knock sound
and if youve snapped a t belt then your lucky its runing at all

 

hi mine is doing it around 2k to 3k did you just change the big end shells and it was ok ,,,mine isent a loud knok yet ,,,like you sead sounds like diesel slap ,,if you just did the shells could you tell me the torq seting and was it a ****ty job to do ,,,1993 classic in-port ej20 engin ,,,sorry for juping in ,,,thanks for any help

 

hi mate i had same problem on my wrx 1995 apart from cambelt snapping...it turned out to be the exhaust shield that was rattling and that was wen i revved between 3-4k...(ended up blowing the engine at the end neway) hope this helps

 

they aren't interference free engines, who told you that?