Noise on start-up

Bad Boy · 01-31-2016, 01:30 PM

Yesterday afternoon I suddenly got this weird loud noise on start-up.
It seems that it goes away if I start up the car when the engine is warm (cant say that is 100% fact though).
Any Ideas on what it could be before I take it to the mechanic?

I checked my oil and it is in the middle of low and full. It looks a little dirty even though I had it changed about 1.5K miles ago.
Coolant looks good and is full.
Powersteering fluid looks full.
The transmission, gear, and clutch fluid have also recently been done.

It sounds like maybe the belt is slipping or something, but usually that would be a higher pitched squeak... maybe water pump?

Something is definitely going bad though.

barncobob · 01-31-2016, 04:09 PM

pic doesnt work,,how many miles? sounds like a worn belt to me.

BboyZ · 01-31-2016, 04:13 PM

Is there something that was done to the car?

Bad Boy · 01-31-2016, 04:13 PM

Quote:

Originally Posted by barncobob

pic doesnt work,,how many miles? sounds like a worn belt to me.

It's not a pic. Its a video. It's working for me. Probably your computer settings.

Bad Boy · 01-31-2016, 04:15 PM

Quote:

Originally Posted by BboyZ

Is there something that was done to the car?

Other than maintenance. No.

Bad Boy · 01-31-2016, 04:15 PM

Starting it with warm engine seems to fix the problem. I'm guessing a pump or valve is going bad.

BboyZ · 01-31-2016, 04:17 PM

Maintenance?? what kind of maintenance? Please note all them that was recently done on the car. this would definitely help us to evaluate the passible cause.

SouthArk370Z · 01-31-2016, 04:30 PM

Sounds like an idler pulley going bad or a belt slipping to me.

90 ST · 01-31-2016, 04:55 PM

Quote:

Originally Posted by SouthArk370Z

Sounds like an idler pulley going bad or a belt slipping to me.

I agree. Idler pulley or something accessory that the belt spins, water pump, Alt. a bearing in one of them for sure.
I would check the belt, if it's good, pull it off and spin each pulley by hand until you find the one making noise.

Z_ealot · 01-31-2016, 05:58 PM

Quote:

Originally Posted by Bad Boy

It's not a pic. Its a video. It's working for me. Probably your computer settings.

Not working for me either and im on an iphone....need to remove that youtu.be from the end of your link as it doesnt work with that on this forum

DOOMMONKEY777 · 01-31-2016, 07:11 PM

ok it sounds like a starter going bad, like as if its miss aligned to the cranks teeth, some one sad earlier that it might be the belt, but if it is then let the car idle...when the rpm drops to ~700rpm normal operation u should hear the belt squeek, a little like ....squeek...skqeek....skqeek every time the cylinder fires, if u dont have that then i think its the starter.

Z_ealot · 01-31-2016, 07:38 PM

Quote:

Originally Posted by DOOMMONKEY777

ok it sounds like a starter going bad, like as if its miss aligned to the cranks teeth, some one sad earlier that it might be the belt, but if it is then let the car idle...when the rpm drops to ~700rpm normal operation u should hear the belt squeek, a little like ....squeek...skqeek....skqeek every time the cylinder fires, if u dont have that then i think its the starter.

Agreed, i know what the belt going out sounds like cause mine is starting to go out and the sound i heard in the video is no where close to the sound my Z is making at the moment which is the sound that doom described exactly

BboyZ · 01-31-2016, 11:06 PM

Mostly likely would be the starter. It has same sound on my rsx when it was loose.

That's why I'm asking what was done..

Bad Boy · 02-01-2016, 01:48 AM

Quote:

Originally Posted by BboyZ

Mostly likely would be the starter. It has same sound on my rsx when it was loose.

That's why I'm asking what was done..

Nothing. By normal maintenance, I meant just oil and fluid changes.
I just got back from work. The car sat for 8 hours and didn't make any noises this time...
Should I still be worried? or am I safe if it just stops doing it for some reason?
the car drives and idles just fine.

Bad Boy · 02-02-2016, 12:27 AM

It did it again this morning, but not at night...

01-31-2016, 01:30 PM	#1 (permalink)
Bad Boy Enthusiast Member Join Date: Aug 2014 Location: Orlando Age: 33 Posts: 295 Drives: 370Z 6SPD Touring Rep Power: 11	Noise on start-up Yesterday afternoon I suddenly got this weird loud noise on start-up. It seems that it goes away if I start up the car when the engine is warm (cant say that is 100% fact though). Any Ideas on what it could be before I take it to the mechanic? I checked my oil and it is in the middle of low and full. It looks a little dirty even though I had it changed about 1.5K miles ago. Coolant looks good and is full. Powersteering fluid looks full. The transmission, gear, and clutch fluid have also recently been done. It sounds like maybe the belt is slipping or something, but usually that would be a higher pitched squeak... maybe water pump? Something is definitely going bad though. Last edited by Trips; 01-31-2016 at 06:21 PM.

01-31-2016, 04:30 PM	#8 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	Sounds like an idler pulley going bad or a belt slipping to me. TreeSemdyZee and MagmaRed370z like this. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

01-31-2016, 07:11 PM	#11 (permalink)
DOOMMONKEY777 A True Z Fanatic Join Date: Oct 2010 Location: Crooklyn Posts: 1,008 Drives: 370Z 6psd-sport-pkg Rep Power: 21	ok it sounds like a starter going bad, like as if its miss aligned to the cranks teeth, some one sad earlier that it might be the belt, but if it is then let the car idle...when the rpm drops to ~700rpm normal operation u should hear the belt squeek, a little like ....squeek...skqeek....skqeek every time the cylinder fires, if u dont have that then i think its the starter. __________________ Kids don't do Drugs, Drugs are bad, so let the professional druggies do Drugs for you. 537whp/496lb/tq@8-9PSI 93 octane

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01-31-2016, 04:09 PM	#2 (permalink)
barncobob A True Z Fanatic Join Date: Sep 2015 Location: hangtown, CA Posts: 1,164 Drives: 16 370Z auto Rep Power: 590	pic doesnt work,,how many miles? sounds like a worn belt to me.

01-31-2016, 04:13 PM	#3 (permalink)
BboyZ Enthusiast Member Join Date: Aug 2015 Location: Arizona Posts: 446 Drives: 2016 Z34 Nismo Rep Power: 10	Is there something that was done to the car?

01-31-2016, 04:15 PM	#6 (permalink)
Bad Boy Enthusiast Member Join Date: Aug 2014 Location: Orlando Age: 33 Posts: 295 Drives: 370Z 6SPD Touring Rep Power: 11	Starting it with warm engine seems to fix the problem. I'm guessing a pump or valve is going bad.

01-31-2016, 04:17 PM	#7 (permalink)
BboyZ Enthusiast Member Join Date: Aug 2015 Location: Arizona Posts: 446 Drives: 2016 Z34 Nismo Rep Power: 10	Maintenance?? what kind of maintenance? Please note all them that was recently done on the car. this would definitely help us to evaluate the passible cause.

01-31-2016, 11:06 PM	#13 (permalink)
BboyZ Enthusiast Member Join Date: Aug 2015 Location: Arizona Posts: 446 Drives: 2016 Z34 Nismo Rep Power: 10	Mostly likely would be the starter. It has same sound on my rsx when it was loose. That's why I'm asking what was done..

02-02-2016, 12:27 AM	#15 (permalink)
Bad Boy Enthusiast Member Join Date: Aug 2014 Location: Orlando Age: 33 Posts: 295 Drives: 370Z 6SPD Touring Rep Power: 11	It did it again this morning, but not at night...