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Old 19th June 2007, 11:20   #1
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Unhappy Pinking noise...

Dear members,

I have been facing an issue with my esteem for a month or two now.

There is a pinking noise that I have observed in my car at engine speeds greater than 2.5k - 3k RPM.

I had consulted Electra in this regard and they diagnosed the problem could be due to :

1. Improper timing - which was rectified promptly.

2. Bad fuel - Promptly filled in 2 tankful's from Shell.

I have regularly used Iftex System G whenever i fill petrol from non Shell bunks.

The pinking noise was still present after the above 2 mentioned points were addressed.

I therefore went to Kapico (Near MMDA, Chennai) as i knew the works manager well enough.

The service technician took a test drive and confirmed the pinking noise was still present.

He checked the timing and fuel quality and they were good.

I was advised to leave the car overnight as they had to check the Tappet adjustments and this had to be done only on a COLD engine.

So i promptly left the car over on Friday morning.

The tappets were adjusted but the pinking noise is still present.

The car is not very smooth like earlier in low RPM's especially when moving from standstill to around 2k RPM. After 2000 RPM the power kicks in and the car accelerates suddenly.

Till then it feels like the wheels are jammed or the vehicle is pulling a very heavy load.

Please help me. What should i do to get the pinking noise eliminated? What are the causes for the noise to occur? what other things need to be investigated?

I also got the a/c coil removed and cleaned, and a/c gas filled. Parking brake play was adjusted.

I am going back in a day or 2 to get the issue resolved. Hoping for some advice to pour in by then.

Thanks in anticipation guys.

P.S. Mod's i hope this is in the right section. If not please do the needful. Thnx.
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Old 19th June 2007, 11:25   #2
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Is the engine overheating?
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Old 19th June 2007, 11:43   #3
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Is the engine overheating?
Nope. the needle is slightly over the halfway mark but way under the red zone.
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Old 19th June 2007, 11:57   #4
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is this a carb version??
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Old 19th June 2007, 12:39   #5
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is this a carb version??
Nope. My esteem is the MPFI model.
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Old 19th June 2007, 12:44   #6
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check the spark plugs, they may be running "Too hot"
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Old 19th June 2007, 12:51   #7
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First of all, it is PINGING and not PINKING. Sounds like marbles in the engine.

It could be caused to - BAD TIMING. Ruled out here because you checked and found it to be right.

Next could be lean mixture. Since your car is MPFI, this may mean that one of the sensors - I am not able to say which(maybe the O2 sensor?) has failed, giving improper reading to the ECU which does not give proper air/fuel ratio as timing advances, leading to pinging. Just theorising of course, but worth a check.
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Old 19th June 2007, 18:07   #8
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Quote:
Originally Posted by tsk1979 View Post
check the spark plugs, they may be running "Too hot"
Ok... How does this translate in english? i would need to explain this to the service advisor.

Quote:
Originally Posted by kuttapan View Post
First of all, it is PINGING and not PINKING. Sounds like marbles in the engine.
I guessed as much. But all the mechanic's corrected my saying it's pinking and not pinging.

Hey psycho where art thou? need your inputs dude.
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Old 19th June 2007, 18:11   #9
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If its the knocking sound tell them to change sparkplugs and then see. If it goes away, well then problem solved.
Spark plugs can cause this, though its one of the less common causes.
Since you have looked at other variables like timing and fuel, this leaves the less common causes.
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Old 19th June 2007, 18:14   #10
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is this a new occurence or started after a particular work?
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Old 19th June 2007, 18:40   #11
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[quote=n_aditya;473247]Ok... How does this translate in english? QUOTE]

Spark plugs have heat ranges. Try running a colder plug. Call J.D. he will help. Also ask Krupesh to hook up the wideband and check the fuel mixture and ask him to personally have a look.

Also your temp needle should be below the half way mark not above.
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Old 19th June 2007, 18:45   #12
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Quote:
Originally Posted by tsk1979 View Post
If its the knocking sound tell them to change sparkplugs and then see.
There is absolutely no knocking. the timing is correct. Its only a pinging noise.

Now is this a bad sign or should i live with it?

Quote:
Originally Posted by Jaggu View Post
is this a new occurence or started after a particular work?
When i first went to Electra, the tappet noise was pointed out to me. About 2 months back i got the a/c belt changed as it was worn out and also used to make a screeching noise on cold starts. After the belt was changed the pinging noise has started. But i did get the timing checked and corrected at Electra. Kapico Maruti confirmed that the timing is correct.

What should i do? i want this thing rectified asap as its my daily drive and i'm also paranoid of leaving the car over at the service station.

Last edited by n_aditya : 19th June 2007 at 18:48.
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Old 19th June 2007, 19:08   #13
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pinging noise = knocking = something wrong with combustion = ignition process = can be timing, to a minor extend tappet, bad fuel, wrong plugs etc etc

Ok, did you change the timing belt also when you replaced the ac belt?

just double check the "timing belt" if all the marks on the wheels are properly aligned.

you will have to take the timing belt cover to check the markings. Then set timing and tappets, esteems generally do have slight tappet sounds and its not advisable to over tight them to make them silent.

if you are in bangalore get in touch with psycho for workshop info.

Last edited by Jaggu : 19th June 2007 at 19:11.
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Old 19th June 2007, 19:11   #14
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Looks like the AC is the culprit here, would suggest that you please check the pressure of the gas in the AC if it is higher than normal (which your ac guy should be able to tell you) it would load the engine that wee bit more which causes the pinging.

I would reccomend to get your valves reset again.
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Old 19th June 2007, 19:18   #15
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Quote:
Originally Posted by Psycho View Post
Looks like the AC is the culprit here, would suggest that you please check the pressure of the gas in the AC if it is higher than normal (which your ac guy should be able to tell you) it would load the engine that wee bit more which causes the pinging.

I would reccomend to get your valves reset again.
Aaahhh at last. A sigh of relief to see your post keshav. Thanks for pitching in.

The a/c gas was low... down to 20% and cooling also was pathetic. Still the pinging noise was apparent.

Got the a/c coil removed, cleaned, and refitted along with gas filled in. Cooling is fine but car is not smooth in the low rev's as mentioned. and pinging noise still persists inspite of tappet adjustment.

Do i still need to check the a/c gas level as the pinging noise was present even before the gas was refilled?

How long and cumbersome is the valve reset procedure?

Jaggu the timing belt is not the culprit IMHO as the timing is fine, but still will have it checked.

Last edited by n_aditya : 19th June 2007 at 19:20.
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