rumbling sound: engine

[june3o]

so.. its been goin on for about a week or two now.. during high rpm's there's a rumble sound coming from the engine..I'm thinkin my exhaust manifold's gaskets needs replacements.. not sure tho.. Need some opinions.. Thanks!

[june3o]

I guess that is the problem if no one cares to comment

[Stephen]

M20s are prone to internally combust, which makes a rumble when the engine is turning

[dandrewg]

M20s are prone to internally combust, which makes a rumble when the engine is turning

This. All my M20s have internally combusted. Especially noticeable at high revs.

[scottinAZ]

M20s are prone to internally combust, which makes a rumble when the engine is turning

Also prone to self destruct, however this may or may not be preceded by a rumbling noise.......

[june3o]

Forgot to mention.. It's an M42 ..I really do think it's my exhaust manifold's.. When I inspected under the hood and reved it, the "rumble" sound did came from there.. Gaskets just came and ima work on it this weekend.. Hopefully thats the culprit..

[immajackuup]

my m42 rumble at idle which I think is kool

[june3o]

well mine is annoying... and mine happens all the time..

[immajackuup]

well mine is annoying... and mine happens all the time..

mine rumble because there's a hole in my muffle.

[june3o]

mine rumble because there's a hole in my muffle.

Yeah.. hopefully my exhaust manifold isn't cracked... Anyways, you know the part # on those studs that connects to the cylinder head to hold the EM.. or maybe specs on em.. I'm already guessin that ima need 16 of em..

[vpilarrt]

Studs = 07 12 9 908 199 -- M7 x 45 long

[io_RobbieRodgers]

Listen real good and make sure it's your exhaust, not your engine. If you're engine's making funny noises (that aren't lifters tapping), I'd first check your chain tensioner.

If it is your exhaust, I'd check the bushings that dampen the bracket that holds the exhaust to the Getrag 240. When my exhaust started making an annoying Honda rattle, I checked underneath and those bushing had completely melted away.