Problem.

[Jeydm]

Well I have a problem. The engine has started to rattle in my 03 ms protege.. Had a compression test done and Mazda told me I was losing compression in cylinders 1 and 3. They recommend a new engine.. My warranty is up by the way.. Its a real faint rattle but its there. Ive had 5 diff mechanics look at it and most had no idea what it was but told me to get a new engine. So i have and am waiting for it. But what if the rattle doesnt go away?? What could it be?? No one has torn the engine down to see for themselves but have all recommended a new engine.. The mods I have on is a custom front mount and short ram intake. No boost controler. boosting at 4-6 psi...

[SeR_Cyclops]

this prolly isnt it but i have heard of peeps dashes rattlin

[Jeydm]

no its def not the dash. You can hear it when your outside of the car..

[smo0f]

rattle like shaking marbles in a can?

[Jeydm]

More like one marble in a can.. Let me further explain. It doesnt rattle all the time, just around 2500rpm and up to probably 4000rpm. Thats it. Never before or after.

[smo0f]

that's detonation man...looks like your engine is bout to go, what kind of fuel and oil do you use? and what are your mods and what are you boosting at?

[smo0f]

i see you already answered my questions. hmm

[smo0f]

have you been always boosting at 4-6 psi? are you the original owner?

[jdm4lyf9]

I had the same problem, come to find out that my motor mounts were split. Was covered under warranty.

[smo0f]

interesting

[Jeydm]

have you been always boosting at 4-6 psi? are you the original owner?
Yeah no more no less.. Original owner.. As far as motor mounts They have been replaced with oem parts.

[smo0f]

what gas octane do you put in it?

[Jeydm]

93 octane. One guy said it might be spark knock or pre detonation and to add octane booster... Tried it and nothing.. I just hope its not top end problems...??

[msp35]

exhaust heat shields.

[Jeydm]

exhaust heat shields.
I thought that too and took it off.. Still rattled...

[MrDiggler]

A rod bearing wouldn't likely stop making noise over a certain rpm, either. Got me stumped. You can check the compression yourself. Testers aren't expensive. Might want to verify what the dealer said.

[Jeydm]

What about a loose wrist pin??? If it were, would i still have to get a new engine?? Cylinder wall fucked???