Go Back   Team-BHP > Under the Hood > Technical Stuff


Reply
 
Thread Tools Search this Thread
Old 7th November 2015, 18:13   #721
Senior - BHPian
 
mayankk's Avatar
 
Join Date: Apr 2010
Location: New Delhi
Posts: 3,901
Thanked: 2,923 Times
Default

Quote:
Originally Posted by sumeethaldankar View Post
Car: Civic
Sound : Typical whup whup sound while driving post 40 to 50 kmph. Sound is heard better if accelerator is let off.

Is this related to tire, wheel bearings or drive shaft ?

I noticed this sound coming after a wheel alignment and balancing job.

Thanks
When you get off the accelerator, press the clutch. Does it die down? My belt when it gave away, made a similar racket whipping inside the bay.
mayankk is online now   (1) Thanks Reply With Quote
Old 18th November 2015, 09:59   #722
BHPian
 
Join Date: Feb 2009
Location: Noida
Posts: 118
Thanked: 8 Times
Default Re: What's that sound?

Guys please help me out.

I was trying to fix up cold start issues in Chevy Spark. I eventually tried resetting ECU by removing negative terminal for 15 minutes. After reassembling I took my car to a spin to my horror car was making huge growling sound (like what planes do just before take off) from the middle or back side. This sound increases with acceleration and vanishes when car is standstill. This sound comes after I cross 20 and becomes very loud at 80kmph. I could also observe decrease in pickup. I drove to office today with same condition but I am very scared.

Car in question went for alignment and balancing just a day before and got a CNG kit fitted.
sparkguy is offline   Reply With Quote
Old 18th November 2015, 12:04   #723
Senior - BHPian
 
tharian's Avatar
 
Join Date: Dec 2011
Location: SBC
Posts: 1,908
Thanked: 1,908 Times
Default Re: What's that sound?

Quote:
Originally Posted by sparkguy View Post
Guys please help me out.

I was trying to fix up cold start issues in Chevy Spark. I eventually tried resetting ECU by removing negative terminal for 15 minutes. After reassembling I took my car to a spin to my horror car was making huge growling sound (like what planes do just before take off) from the middle or back side. This sound increases with acceleration and vanishes when car is standstill. This sound comes after I cross 20 and becomes very loud at 80kmph. I could also observe decrease in pickup. I drove to office today with same condition but I am very scared.

Car in question went for alignment and balancing just a day before and got a CNG kit fitted.
Sounds like a leaking exhaust system.
All the observations you have mentioned point to that and moreover Spark has the issue of muffler rusting and leaking.

Suggest you check for exhaust leaks and get them plugged or replace the muffler.
tharian is offline   Reply With Quote
Old 18th November 2015, 12:51   #724
BHPian
 
Join Date: Feb 2009
Location: Noida
Posts: 118
Thanked: 8 Times
Default Re: What's that sound?

Quote:
Originally Posted by tharian View Post
Sounds like a leaking exhaust system.
All the observations you have mentioned point
Thanks!!

Few doubts
1) Why it didn't show up when car is still and I floor the accelerator
2) It has to do anything with ECU reset or it is just a coincidence
and lastly
how urgent it is to get that fixed? Can I wait till weekend?
sparkguy is offline   Reply With Quote
Old 18th November 2015, 12:56   #725
Distinguished - BHPian
 
a4anurag's Avatar
 
Join Date: Oct 2011
Location: Hyderabad
Posts: 8,381
Thanked: 9,845 Times
Default

Quote:
Originally Posted by sparkguy View Post
Few doubts
1) Why it didn't show up when car is still and I floor the accelerator
2) It has to do anything with ECU reset or it is just a coincidence
If it is coming when in motion then I don't think it is exhaust leakage. Hopefully it is not bearing sound.
a4anurag is offline   Reply With Quote
Old 18th November 2015, 14:15   #726
Senior - BHPian
 
tharian's Avatar
 
Join Date: Dec 2011
Location: SBC
Posts: 1,908
Thanked: 1,908 Times
Default Re: What's that sound?

Quote:
Originally Posted by sparkguy View Post
Thanks!!

Few doubts
1) Why it didn't show up when car is still and I floor the accelerator
2) It has to do anything with ECU reset or it is just a coincidence
and lastly
how urgent it is to get that fixed? Can I wait till weekend?


If there is no sound when the engine is revv'd when the car is not moving, then it is not a exhaust leak.
I assumed the engine was in idle when in standstill.
tharian is offline   Reply With Quote
Old 18th November 2015, 14:19   #727
BHPian
 
Join Date: Feb 2009
Location: Noida
Posts: 118
Thanked: 8 Times
Default Re: What's that sound?

Quote:
Originally Posted by tharian View Post
If there is no sound when the engine is revv'd when the car is not moving, then it is not a exhaust leak....
Thanks once again.

So whats that sound? I am really confused and don't know what to do. Anyone who can help me out?
sparkguy is offline   Reply With Quote
Old 18th November 2015, 14:27   #728
Senior - BHPian
 
Join Date: Jul 2010
Location: Bangalore
Posts: 1,566
Thanked: 2,363 Times
Default Re: What's that sound?

Your best bet is to get the car on a workshop lift and inspected thoroughly, preferably with a trustworthy service technician present. Guesswork at home when you probably can't clearly see the offending part/area won't lead to any proper conclusions.
Chetan_Rao is online now   (1) Thanks Reply With Quote
Old 18th November 2015, 14:49   #729
Distinguished - BHPian
 
a4anurag's Avatar
 
Join Date: Oct 2011
Location: Hyderabad
Posts: 8,381
Thanked: 9,845 Times
Default

Quote:
Originally Posted by sparkguy View Post

So whats that sound? I am really confused and don't know what to do. Anyone who can help me out?
I agree with Chethan. There is no point in trying to find a pin on haystack.

Take the car to any reputed FNG or if you trust the Chevy ASC, decorate that sound to them and you'll get the solution.

Do check for wheel bearings in all 4 wheels.
a4anurag is offline   Reply With Quote
Old 18th November 2015, 14:53   #730
Senior - BHPian
 
DRIV3R's Avatar
 
Join Date: Nov 2009
Location: India
Posts: 1,545
Thanked: 747 Times
Default Re: What's that sound?

Quote:
Originally Posted by prkiran View Post
Car: Fiat Punto Evo MJD; 2 weeks old, 400 kms on the ODO
Sound: A hissing noise from the underbody towards the exhaust whenever the car is idling. This is noticeable only if I stand by the side or right behind the car and not at all noticeable from the inside. This is the first diesel car I am driving so not sure if this is normal. Experts?
This is normal, and it is the fuel pump which is present under the rear seat.
DRIV3R is offline   (1) Thanks Reply With Quote
Old 18th November 2015, 16:43   #731
Senior - BHPian
 
sumeethaldankar's Avatar
 
Join Date: May 2007
Location: Mumbai
Posts: 2,358
Thanked: 741 Times
Default Re: What's that sound?

Quote:
Originally Posted by mayankk View Post
When you get off the accelerator, press the clutch. Does it die down? My belt when it gave away, made a similar racket whipping inside the bay.
It was diagnosed as tyre noise by Honda.
sumeethaldankar is offline   Reply With Quote
Old 24th November 2015, 21:04   #732
BHPian
 
dass's Avatar
 
Join Date: May 2008
Location: Bangalore
Posts: 901
Thanked: 303 Times
Default Re: What's that sound?

Car in question is a Dzire VDI. Done around 27kms.

Off late, when i take some bad roads (which are everywhere) there is a 'clunk' kind of sound coming from the right side and I think its from the front tyre. What could this be?

Recently, I had to get the vehicle checked for a juddering sound and vibration in the steering whenever the steering is tilted slightly to the left and I go over bad patches. The service center fixed it and they said they did not change anything, but greased the rack and pinion. Suggestions?
dass is offline   Reply With Quote
Old 24th November 2015, 21:26   #733
BANNED
 
Join Date: Nov 2015
Location: Trivandrum
Posts: 88
Thanked: 54 Times
Default Re: What's that sound?

The car in question is a 6 month old Honda Mobilio. It has done ~5000 kms.

Whenever we take the car on a bad road or a simple bump, there is this shuddering sound coming from the rear right side. I suspect it is coming from the exhaust, but hey, I'm only in 9th grade.

Can someone tell me if this is normal or what you guys think about it.

Please and thank you.

-Adhi
The Dude is offline   Reply With Quote
Old 28th November 2015, 12:03   #734
BANNED
 
Join Date: Nov 2010
Location: Delhi
Posts: 17
Thanked: Once
Infractions: 0/1 (5)
Default Abnormally loud sounds when running on bad roads / potholes

Hi

When I drive my old swift (2009 model), I feel very loud sounds (like dropping some heavy object from a height) particularly when crossing bad roads and potholes. It feels like shockers are gone or tyres have no air; but I have replaced my shockers few years back and the tyres also have good air pressure. Can someone help me identifying whether the in cabin insulation has weakened or what could be the problem? I am taking the car for servicing now and want to get this corrected.

Thanks.
mr.mehra is offline   Reply With Quote
Old 22nd December 2015, 15:00   #735
BHPian
 
Join Date: Oct 2005
Location: @ Driver's Seat @
Posts: 668
Thanked: 46 Times
Default Swift "Khat Khat" Sound From Underhood

Mods : Kindly merge with existing thread, if any .

Issue : Swift Petrol 2007, Khat Khat sound before ignition

Hello Friends,

My swift vehicle is facing a unique noise " khat khat " sound from the enginebay. It happens randomly. Have been to the service station, but couldn't reproduce it before them. They just tightened the fan belt.

This is how it happens.

I push the key in, make one turn [ Ignition is not yet happened ] . All Pumps churn and then the "khat khat " sound starts continuously. Sometimes, it happens, sometimes it doesn't. It is as if something is getting hurt inside or something is turning and touching something before the engine is started.

Sound can be heard from the left of the engine bay, at the place marked in the picture attached.

Any help in finding the solution is highly appreciated.
Attached Thumbnails
What's that sound?-engine_bay_noise.jpg  

lambuhere1 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Audi's Sound Concept cabin defines auditory excess: 62 speaker surround-sound ! dar3dev|l In-Car Entertainment 10 22nd June 2010 15:23
Sound from Engine Bay of Swift VDI (DDIS) - what would be the cause of this sound? DieselFan Technical Stuff 4 25th January 2008 18:31
Cant afford a Turbo? Buy JUST the sound GTO Modifications & Accessories 15 7th January 2006 17:03
My Vtec's Sound system! GTO In-Car Entertainment 55 12th February 2005 22:36
wanna know how the ENZO, F50, F40, 280 sound _Crazi4Speed_ The International Automotive Scene 0 6th July 2004 12:56


All times are GMT +5.5. The time now is 15:50.

Copyright 2000 - 2016, Team-BHP.com
Proudly powered by E2E Networks