Hey guys, I have a 99 Civic Si with 80k miles.

My car is making this random grinding noise. It only grinds when I'm only giving it gas AND when I'm giving it gas while the clutch is halfway pressed. It doesn't make the noise when I press/depress the clutch at neutral or when I'm about to shift. The noise sounds like it's coming from the passenger side.

Anyone know what it could be? Is it bad if I ignore it? New here, please help.

Thanks

 

Does it make the noise when the clutch is not pressed and the gear is in neutral? Does accelerating during a hard turn change the sound at all?

 

No, it doesn't make the noise when clutch is not pressed while in neutral and it doesnt change the sound during hard turns. It only makes the noise randomly when I'm giving it gas. Sometimes it doesn't.

 

I have a similar problem, but my car does it when it's sitting in neutral, so I assume it's the ISB. I'm probably just gonna swap the whole tranny for an si tranny.

 

See, the problem diagnosing this is that grinding and rattling are usually two very different sounds. If you just said grinding, I'd say that maybe your clutch plate is worn down to the metal and slips sometimes when you try to torque the motor. If you just said rattling, I'd say a heat or dust shield or some similar piece of thin sheet metal is rattling when the motor torques and shakes.

 

Grinding. And yea, it happens when I try to torque the motor

 

Trying dropping the tranny and check if anything is loose or broken, and then replace the clutch and throwout bearing. Just for a shot at it.

 

exhaust heat shield ?!

 

is it from the engine area or does it sound like metal hitting metal or glass. it took me a while to figure it out it sounds like it's in the back of the passenger side or underneath. mine ended up being in the trunk reach in and up and 2 metal bars started banging against each other when driving slower or stopped or accelerating. I wedged a paper towel in there it fell out in x week then I used an old t shirt solved