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#3392093 - 06/08/14 10:39 AM Re: three knocks heard at idle after sitting overnight [Re: npfd]
Trav Offline


Registered: 11/20/06
Posts: 9106
Loc: MA, Mittelfranken.de
I don't think its anything to do with the ABS, IIRC there is no mechanical check of the system that would be audible just an electronic check which is complete when the ABS light goes off.
AIR pumps can make a lot of noise when worn and it is located on the driver side under the side of the front bumper.

The only cars i can remember that made hydraulic cycling noises was the Citroen's, the old DS, CX and SM cars especially were an orchestra of knocks, clicks and double clicks but nothing like that on US cars.

Testing the AIR pump is easy enough just jump the relay, also check any solenoids in the system as they can make noise also.
I don't want to send you down a path with this thought, its a way off guess looking for the obscure nothing more.

You need a second person, start the car cold with the hood open let it run a min or two while you listen then have someone put it in drive and hold the brake (e brake on) and keep listening for a few min.

I cant thing of anything that would give three distinct knocks in this engine internally then stop but externally mounted solenoids and other parts could, it could also be in the transmission but that would be remote.
Next time your at the red light where is usually does this put it in neutral and see if there is any difference.

Diagnosing something like this is a difficult enough when you have the car in front of you on a message board its darn near impossible except for endless guessing.
I think the ARX is just a coincidence unless it was a lifter or something but that shouod be a noise easy enough to identify.
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#3395293 - 06/12/14 12:58 AM Re: three knocks heard at idle after sitting overnight [Re: npfd]
npfd Offline


Registered: 06/05/14
Posts: 7
Loc: Canada
Thank you very much again Trav,

I will have to look into testing out the air pump, as for someone to listen in on the issues will be hard...

I tried it in neutral while waiting at the light, same knock.. actually now I notice that he first knock sounds a little different than the next two which are identical to each other.

Sure, rods, or worn valves can't make this sound...

Tongiht was louder, cause the temp was 15 degrees celsius.... with it 25+ knock is much fainter and quicker sounding...

hehe yes diagnosing via forum is hard...

Thank you again

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#3395310 - 06/12/14 02:34 AM Re: three knocks heard at idle after sitting overnight [Re: npfd]
MDettling Offline


Registered: 10/20/13
Posts: 5
Loc: Oregon
A/C compressor? Just a shot in the dark.

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#3400227 - 06/17/14 11:38 PM Re: three knocks heard at idle after sitting overnight [Re: npfd]
npfd Offline


Registered: 06/05/14
Posts: 7
Loc: Canada
Thank you for the reply... I had the A/C refilled a tad due to it not working as well..... and I did see some spray marks around it this passed spring....

I did try with the AC engaged, and still heard the knocks....

I will have to look into things a bit more.. thanks... would it be a rod?

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#3400235 - 06/17/14 11:57 PM Re: three knocks heard at idle after sitting overnight [Re: npfd]
Clevy Offline


Registered: 11/11/10
Posts: 6988
Loc: Saskatoon canada
Could it be the knock sensor testing the fuel octane by advancing timing til knock is audible then retarding it?

I'm thinking the engine has significant carbon accumulation in the combustion chambers which is raising compression,so at start up when the ecu isn't reading the o2 sensors the stock timing is too much so once knock is heard timing is adjusted?

Just throwing out ideas.
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#3401916 - 06/20/14 12:03 AM Re: three knocks heard at idle after sitting overnight [Re: npfd]
npfd Offline


Registered: 06/05/14
Posts: 7
Loc: Canada
Thank you Clevy for the input....

Could be a possibility just not sure on how to go about testing the knock sensor...

I thought it could be the combustion chamber.. ran BG 44k, once, and the oil level dropped, ran lucas upper lube, and ran the Techron 2 times so far, might do a third soon...

I did read online of a Red Line, additive.. how would that be?

Thank you

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#3401930 - 06/20/14 12:46 AM Re: three knocks heard at idle after sitting overnight [Re: npfd]
Clevy Offline


Registered: 11/11/10
Posts: 6988
Loc: Saskatoon canada
Originally Posted By: npfd
Thank you Clevy for the input....

Could be a possibility just not sure on how to go about testing the knock sensor...

I thought it could be the combustion chamber.. ran BG 44k, once, and the oil level dropped, ran lucas upper lube, and ran the Techron 2 times so far, might do a third soon...

I did read online of a Red Line, additive.. how would that be?

Thank you



Look at the mds of the products your interested in. There is a product called "guaranteed to pass" with 25-35% amines,so if the redline or techron branded stuff is less concentrated I'd try to find gtp instead.
Or double dose weaker stuff.
For significant build up 1 tank won't be enough and I'd even consider a piston soak via a vacuum line with mmo or something.

Again,just ideas,
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2006 Charger RT
Miles x 2 per oil filter

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