When I am at cruising speed and accelerate a bit harder, I get a noise that sounds diesel engine-ish. Almost like engine run-on? I know... not the best description, but if anyone can identify the possible issue, I would appreciate it.

 

AT or MT?

 

something like valve noise. If it is I hear it too but somewhere I read thats just the injectors. I have an 06 mt.

 

flywheel rattle?

 

you need to check your fuel damper - it's a device that damps hydraulic pressure variations in the fuel lines, introduced by the fuel pump. i had the same problem, replaced all gaskets in the exhaust (thought i had exhaust leak), ended up taking it to the dealer, and they changed out the fuel damper - and the problem went away.

 

Sorry it took me so long... Thanks for the replies. It is an AT. I'll check the fuel damper. Anyone ever replace this themselves?

 

check your oil level too

 

That's what I was going to suggest as well.

 

i think i know exactly what he's talking about.... mine makes a noise like that in situations such as when im in 3rd gear and slow down a little to turn onto another street and dont downshift into 2nd... then if im going too slowly, as soon as i hit the gas it makes a diesel-ish noise for just a second.....

thats if im still going fast enough not to lug the engine, but where 2nd gear would have been a little better coming out of the turn

 

Uh, are we talking about engine knocking here?
What octane fuel are you using? Anything less the 91 will cause knocking and/or pinging, even though the G has a sensor to detect early detonation and retards the timing. The sensor detects the knocking by the noise signal - the knocking sound can only happen when knocking starts so the sensor only kicks in after the fact.

Knocking is not good, as you are loading the engine and causing the fuel to detonate before it is supposed to. You can really screw the engine so if you are using 87 or 89, go fill up with 91 or higher ASAP.

 

my G has never had anything but 93 in her....

and the sound im talking about SEEMS more like it might be from the transmission, but i really dont know

 

sounds like tranny rattle

 

i have the exact same problem. whenever the RPMS are very low and you push it too hard, it does that for a second. When I first bought the car, the dealer said all Gs do that, and it's normal operational noise lol.

 

Happens to me too! Sounds like it is coming from the stock Cat. Converter. It is similar to the noise i used to get on my old cars with Test pipes in place of the stock cat's.

It seems G's really don't like low RPM, they fall on their face below 1.5k.

 

mine does it too its annoying... as long as its normal i guess..