4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

knock sound when idling.

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Old 07-15-2007, 06:01 PM
  #11  
undecided.steve
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Default RE: knock sound when idling.


ORIGINAL: wildazme

well finally found what the noise was on my car i saw that my crank shaft pully was a lil loose causing it to wobble some. i tightened the center bolt and now the noise is gone.
Good find!
I'll bet your wallet feels a lot better too [8D]

(ie: internal engine repairs = $$$$$$$$$$$$$$$$$$$$$$)
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Old 07-15-2007, 06:19 PM
  #12  
99gtstang
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Default RE: knock sound when idling.

ORIGINAL: siwelk

http://s184.photobucket.com/albums/x...t=MOV00826.flv


heres my problem...
mines does the same not as loud untill it warms up
I had a FORD PROBE that did that and a FORD Sport Trac i think it's just ford
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Old 07-15-2007, 10:47 PM
  #13  
Sniper6677
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Default RE: knock sound when idling.

ORIGINAL: 99gtstang

ORIGINAL: siwelk

http://s184.photobucket.com/albums/x...t=MOV00826.flv


heres my problem...
mines does the same not as loud untill it warms up
I had a FORD PROBE that did that and a FORD Sport Trac i think it's just ford
chevys tap alot worse...i had a probe that only tapped when it was low on oil 100k+ miles and had a leaky front main...took care of that tho

i had a ****ty v6 camaro that had 61k on it when i bought it and it tapped like crazy...same with a blazer i had too so its not just fords
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Old 07-15-2007, 11:16 PM
  #14  
oxfordgt
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Default RE: knock sound when idling.

Spun bearings is more of a ticking sound. It sounds like a collapsed lash adjuster. Which means you have an oil flow problem.
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Old 07-16-2007, 09:11 AM
  #15  
undecided.steve
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Default RE: knock sound when idling.

Some Chevy motors suffer from "piston slap' which is most noticeable when the motor is cold.
The Ford 4.6 has the "rattle sound" upon start up, which is intermittent and will sometimes
be aggravated by certain brands of oil filters because of drain back valve location. It doesn't harm anything though
but can be annoying.
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Old 07-16-2007, 02:23 PM
  #16  
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Default RE: knock sound when idling.

Blown exhaust manifold gasket? Loose exhaust manifold bolts? Header bolts are notorious for coming loose.
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Old 07-16-2007, 02:28 PM
  #17  
bt1288
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Default RE: knock sound when idling.

Keep on Knocking, but you can't come in.
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Old 07-16-2007, 02:32 PM
  #18  
Derf00
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Default RE: knock sound when idling.

Lol you peeps crack me up..he already said he found his problem and you're still just throwing ideas out
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Old 10-11-2011, 09:46 PM
  #19  
Danielsmustang
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hey guyssss, i know this is a very old thread and all but, just wonderingg.. could you post up the vid again, because it doesnt let me see it, it says its a private album, so like, instead of asking a old question i would like to hear and see if this is my problem. thank you
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