noise from engine

[lifelicksballs]

when i press on the gas and start boosting i start hearing this rattling noise from the engine i can't really pinpoint exactly where and my friend said when he rides behind me he could see smoke come out of the exhaust sometimes...what could it be and how can i locate the problem?

[r34 gtr]

first off, (and im pretty sure i speak for everyone) we're gonna need a detailed description of said rattle. secondly, what color is the smoke?

can you get the car to make the noise when its parked? i know if i stab the gas hard enough it will start to build boost in neutral, however it might not be enough to get it to produce this rattle.

- tim

[lifelicksballs]

sorry, i was kinda in a rush but the rattling sound i kinda pinpointed is inside the engine towards the intake side and it only rattles when i push on the gas kinda hard and disregard the smoke it went away for some reason

the rattling sound sounds kinda like some kinda metal that's loose

any comment would help

thanks

[nnkfws333]

My rattle is still is rattling is my downpipe hitting my frame

[gore]

spun bearing maybe

[lifelicksballs]

okay it's actually getting worse now it's everytime i press the gas in gear i would hear a rattling but never in idle or neutral

how would i tell if it's a bearing or not

[c-rad]

okay it's actually getting worse now it's everytime i press the gas in gear i would hear a rattling but never in idle or neutral

how would i tell if it's a bearing or not

If it only does it when there is a load on the engine, then it is quite possibly rod knock. I would still check everything else though before you put it out of comission.

[lifelicksballs]

you're kidding!isnt rod knock like a heavy knocking sound?mine sounds like it's at the top of the engine and sounds like a penny is stuck in the laundry

would compression check help??

[lifelicksballs]

update: okay i ran without the hood and told my friend to listen while i did a slow drive by but now the sound can barely be heard in 1st and 2nd but 3rd it's clearly audible...also at idle we could hear a VERY fain light rattle inside the intake (?) or near there

also i dont know if it'll be relevant but for some reason a bolt holding the intake and the engine together kinda came loose

[c-rad]

update: okay i ran without the hood and told my friend to listen while i did a slow drive by but now the sound can barely be heard in 1st and 2nd but 3rd it's clearly audible...also at idle we could hear a VERY fain light rattle inside the intake (?) or near there

also i dont know if it'll be relevant but for some reason a bolt holding the intake and the engine together kinda came loose

Have you ruled out transmission noise? Does it happen only while its in gear and driving or can you duplicate the noise while revving it in neutral? My friends 2nd gear grenaded in his DSM (no kidding!) and whenever he put it in 2nd, it made a noise that sounded just like rod knock.

Rod knock usually gets progressively worse. Can start out faint, then start to get pretty loud.

[gore]

Rod knock usually gets progressively worse. Can start out faint, then start to get pretty loud.

all too true

[boost_boy]

you're kidding!isnt rod knock like a heavy knocking sound?mine sounds like it's at the top of the engine and sounds like a penny is stuck in the laundry

would compression check help??

Your #1 or #3 or both piston rod bearing(s) are done. Check it yourself, but I'm pretty sure that I'm correct or extremely close. And the more you drive it, the more you screw up your crank journals.

Dee