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Old 24th August 2009, 23:10   #1
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Default Swift Vdi- Knocking Sound

I have completed 32,000 km then i given for service ABT, chennai they changed into air filter , oil changes and engine tunning also. Before service i don't have the any probelm, after service once i have reached into more than 80 km speed i am getting sound from the engine cabin. I have asked the service center peopl's thay are telling normal sound only... after that they tunned my engine once again...still i am getting the knocking sound like dah.. dah.. once i have reached into more than 80km speed...

Guys can you please respond my query ... how resolve stop the sound .. please give me valuable suggetion to me....i am waiting for team-bhp peoples suggestion....
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Old 24th August 2009, 23:20   #2
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Can you explain the sound more, you are sure its not diesel engine pitter patter sound? Does it happen when accelerating or holding the accelerator at a particular RPM? Does it happen in all gears?
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Old 25th August 2009, 00:23   #3
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Its happening when i am accelerating only, not holding the accelerator. I am not sure about the all gears, the slow speed (30-60) sound is less and (80km-120 km) the sounds is more. I have checked the mechanic, he told the sound is called by KNOCKING. I am sure diesel engine pitter patter sound only.

Last edited by Jaggu : 25th August 2009 at 11:52. Reason: Please avoid typing... like... this.. with dots. Thanks.
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Old 25th August 2009, 11:55   #4
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Well one things you can try is, ask the mechs to check if there is any air caught in the fuel line or filter. Bleeding the lines will help to check this, then see if the sound subsides.

Any idea what was the tuning that they did? DDIS engine doesnt have anything much which can be tuned, hence asking.
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Old 25th August 2009, 12:01   #5
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Can you tell at which gear this is happening. AFAIK the ddis does should not knock at those speeds.
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Old 25th August 2009, 12:22   #6
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Would recommend that you get the fuel pump checked.
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Old 25th August 2009, 17:20   #7
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Ok i can try it if any air is caught in fuel or filter. i don't know what they have done in tunning and today moring also i have tried it , the sound is happening in 4th and 5th gear only. any idea about it?

I have tried in shell diesel as well as HP turbo also, same sound is coming from engine cabin

Last edited by Jaggu : 25th August 2009 at 17:37. Reason: Back to back posts.
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Old 25th August 2009, 17:42   #8
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arun: What Psycho meant was to check the fuel pump feeding the diesel in the car, also try using normal IOC diesel and see if there is a difference.

If its only in 4th and 5th gear, i would suggest showing the car at another reliable A.S.S and ask them to rule out any gearbox issues, just in case.
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Old 25th August 2009, 22:26   #9
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i wonder what did they tune. Did they fiddle with the ECU?

Did they touched the nozzles.?

Just to be sure does the sound goes if you down shift.
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Old 25th August 2009, 22:32   #10
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In the Swift D, often the tappet noise can be assumed to be knocking. I hear this has been an issue with many customers complaining about the hydraulic tappets.
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Old 25th August 2009, 23:24   #11
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I don't know what they are tunned my engine...They didn't touched in nozzles.....can u suggest me for good mechanic in chennai for DDIs engine? I am not satisfied with ABT...Please help me



Mod Note: Kindly avoid using dotty style of posting.
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Old 25th August 2009, 23:26   #12
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Arun,

Is the knocking sound a metallic pinging noise? The normal diesel pitter patter will be more of a grating, gravelly noise.

If using premium fuel it is better to stick to either premium only or normal diesel only. Mixing the two can cause the injectors to clog up. Seems like the additives in the premium fuel can loosen the residue left in the tank by normal fuel and clog up your injectors.

Drive on,
Shibu.
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Old 25th August 2009, 23:35   #13
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Get the injector nozzles checked and ECU Tuning pertaining to those. They can be the only reason
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Old 26th August 2009, 00:24   #14
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I have asked with mechanic, he told me its konocking sound.Before that i have mixed with premium and non premium also. now i am only using the HP turbo, but the sound is there.
This week end i am going to check with injector nozzles checked and ECU Tuning pertaining
Any good service center in chennai? Please suggest me
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Old 26th August 2009, 14:58   #15
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Does it happen when accelerating or holding the accelerator at a particular RPM? What does this mean?
I have had similar issues at 1600-1800 RPM, observed mostly in 3rd gear. It happens when we maintain the same rpm. The clatter significantly changes and increase in noise is seen. Else it is not observed.
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