Notices
Maintenance & Repair 350Z up keep and diagnosing/fixing problems

"Dunk Sound" When Starting: Anyone Else?

Old 02-18-2003, 02:59 PM
  #1  
rickski
Registered User
Thread Starter
 
Join Date: Jun 2002
Location: Safety Harbor
Posts: 79
Likes: 0
Received 0 Likes on 0 Posts
Default "Dunk Sound" When Starting: Anyone Else?

Is anyone else having this?

After the car has not been started for a couple of days (or more), I hear a "dunk sound' when I start the car. This is followed by a rattling sound that goes away in about 2 seconds. What is this?
rickski is offline  
Old 02-18-2003, 04:43 PM
  #2  
sunzet
Registered User
 
Join Date: Jan 2003
Location: VA
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
Default

I heare the same dunk sound you are talking about. I think it does that as soon as you turn the key to the acc position. It seems to be turning the fuel pump on.

I also hear the rattling sound and I am puzzled about this one too but It seems to come from the gear box. Mine only does it everynow and then specially when it is too cold (20 to 30 F).
sunzet is offline  
Old 02-18-2003, 05:50 PM
  #3  
rickski
Registered User
Thread Starter
 
Join Date: Jun 2002
Location: Safety Harbor
Posts: 79
Likes: 0
Received 0 Likes on 0 Posts
Default

My "dunk" sound happens as soon as I am turning to motor over... then the motor starts....then a rattle sound follows for a few seconds. I'm worried I may have a serious problem. This happens only when it has sat for a couple of days....or more. I followed proper breakin procedure and have never taken it up to redline.

I am hoping this is normal.
rickski is offline  
Old 02-18-2003, 07:20 PM
  #4  
my3rdz
Registered User
 
Join Date: Jan 2003
Location: Wenatchee
Posts: 21
Likes: 0
Received 0 Likes on 0 Posts
Default

Check to see if your air conditioner/fan control is on automatic. Try starting it next time with the fan switch turned to off and see if you here the noise.
my3rdz is offline  
Old 02-19-2003, 05:55 AM
  #5  
jelledge
Registered User
 
jelledge's Avatar
 
Join Date: Jun 2002
Location: Idaho
Posts: 293
Likes: 0
Received 0 Likes on 0 Posts
Default The sound is the ABS self check

You are hearing the ABS unit go through a self check routine. The owners manual says this somewhere in it.
jelledge is offline  
Old 02-19-2003, 09:52 PM
  #6  
DrivenZ
Registered User
 
Join Date: Jun 2002
Location: Washington DC
Posts: 9
Likes: 0
Received 0 Likes on 0 Posts
Default

I am also getting the same matallic dunking sound. It is only for a couple of seconds then it goes away. I dont know if I should take it to the dealer. Are you sure that this is the ABS. Yes it does happen more often when its cold and the car has been sitting for a while.
DrivenZ is offline  
Old 02-19-2003, 10:34 PM
  #7  
s9am_me
Registered User
iTrader: (1)
 
s9am_me's Avatar
 
Join Date: Dec 2002
Location: bay area - peninsula
Posts: 1,355
Likes: 0
Received 0 Likes on 0 Posts
Default

hmmm.. the only dunk sound i experience is when i turn on the AC. Maybe thats what you guys are hearing If your fans are set on Auto.. just as another person mentioned... it turns on the A/C automatically on start up. Try turning off and on the AC button. See if its the sound you are experienceing. Just a thought
s9am_me is offline  
Old 02-20-2003, 02:17 AM
  #8  
jreiter
Registered User
iTrader: (6)
 
jreiter's Avatar
 
Join Date: May 2002
Location: san luis obispo, ca
Posts: 1,584
Likes: 0
Received 0 Likes on 0 Posts
Default Re: The sound is the ABS self check

Originally posted by jelledge
You are hearing the ABS unit go through a self check routine. The owners manual says this somewhere in it.
I'd have to agree. My Audi does the same thing. Occasionally clunks right when you first start up the car. This is mentioned in my Audi manual. Does the 350's manual not talk about it?
jreiter is offline  
Old 02-20-2003, 04:20 AM
  #9  
hwj
Registered User
 
Join Date: Jan 2003
Location: New London, Pennsylvania
Posts: 152
Likes: 0
Received 0 Likes on 0 Posts
Default

I agree: It's the ABS self-check.

It is in the owners manual on Page 5-21.
hwj is offline  
Old 02-20-2003, 02:43 PM
  #10  
rickski
Registered User
Thread Starter
 
Join Date: Jun 2002
Location: Safety Harbor
Posts: 79
Likes: 0
Received 0 Likes on 0 Posts
Default A little More Info

1) I religously turn of my AC (auto to off) prior to shutting the car of. Therefore, when starting, the AC unit is off.

2) There are, essentially, two noises:
a) The "dunk sound" occurs immediately when the motor fires. ("dunk vrooooooooooom")
I would not expect this to be an ABS test. Especially since it only does it after the car sits for a few days. I would expect the ABS test to occur (and therefore the dunk sound) every time the engine started.

b) The "rattling" noise occurs right after the "dunk sound" for approx 2 seconds.


Thanks in advance for your input on this.
rickski is offline  

Thread Tools
Search this Thread

Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: