my coupe has started making a faint grind sound on start-up.
the engine starts then there is a faint grind like the starter is disengaging or something. it only does it on the first start after sitting for a couple hours then after that is starts very smooth. i am using premium gasoline and switching manufacturers doesnt fix it. i am also getting some definate louder knocking on start-up. problem is the car has to sit for a day and then it only happens one out of two tries. my mechanic said "oh well you have lots of warranty left" but i hate to hear odd sounds come from my car. has any one else heard any bad sounds on start-up? try starting the car first thing in the morning with the door open and listen for a faint grind. on a normal start i hear a faint whine sound that i take as normal. any feed back would be awsome. thanks.

g35coupe

 

do you have the 6mt?
I feel some kind of grinding if I step on the break pedal soon after startup.

I have no idea what it is, but doesn't seem right.

BS G35C 6spd navi/aero/prem

 

nuckchew: yeap, i have the same problem, i have a 5AT and my car has to sit in the garage for 1-3 days at a time sometimes, and I _always_ hear a kind of grinding noise...i hate it... but I know if it take it to the dealer he won't hear anything, it's just the way it is, you can never reproduce something when you need to.


OvaYahead: you're probably feeling the ABS self-test, no big deal.


CB 5AT - SAC, CA

 

I just stated getting the grinding sound reently also. I noticed it after getting my first total service. ynihk it was 8100 mile service. Anybody else get serviced before the heard it. I figured it was somthing they jacked up during thier engine clensing treatment.

 

my dealer just checked this out and he ordered a new starter for the car. it is just an educated guess though. i am also noticing a faint ticking and apparently the lifters are making some noise! they said to monitor it. yeah right! i still have to talk to him but if it is lifters i can see a new engine installed in the near future. this is kinda disappointing.

g35coupe

 

nukchew: Let me know if starter eliminates that sound. I'm getting the same grinding noise during startup. I drive my car about 2-3 times a week.

Thanks

 

i've noticed this faint grinding noise too on my auto sedan after startup. this seems to go away when the engine warms. anybody know what this is?
thanks.

 

follow link may helps answer all your questions.

https://g35driver.com/forums/showthr...+noise+startup