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#1
07-03-2009, 03:59 PM
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engine knock noise
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#2
07-04-2009, 01:05 AM
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Sorry to hear about your problems, just sell your car and run to the nearest lexus dealer. J/k
__________________
03 E53 X5 4.6is Sapphire Black on Black 08 e65 750i Alpine white, Sport Package
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#3
07-04-2009, 03:24 AM
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can you get a decent quality sound clip/video?
__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is 
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#5
07-04-2009, 09:46 AM
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engine knock
weasel i posted a sound clip....if you pay close attention at about the 33 to 39 second period you will hear the 3 or 4 knocks...it happens when the engine goes to low idle...i will repost the clip..thanks if you hear it let me know what you think...weasel if you search "engine knock" the third one down says cavx5 and it is the first post it is on you tube..thanks
Last edited by cavx5; 07-04-2009 at 09:52 AM. Reason: add content
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#7
07-04-2009, 01:10 PM
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hi all posted youtube video of engine and if you listen closely at the 35 sec to 37 sec portion of the video you can hear 3 knock sounds when the engine goes to low idle....here is he link but please forgive me if it dosent work ..i am not very computer savy...let me know what you think..thanks rob
YouTube - engine knock 2005 x5 4.4 with 18k miles 
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#8
07-04-2009, 03:56 PM
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I believe that noise may be a result of a mixture of things... As it occurs when the idle is dropping to normal you have a few things happening. The ignition timing is being advanced until the point of ignition induced knock, then the knock sensors tell it what is too far and retards it back until it smooth out. The level of things electronically and mechanically adjusted on these engines for the power they have is pretty great, and will have some different characteristics than engines that don't have them.
I don't believe it is a sign of excess slack in any bearings, rods or wrist pins as that would be more constant and reproducible at other times.
__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is
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#10
07-04-2009, 05:30 PM
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What octane gas are you using?
__________________
03 E53 X5 4.6is Sapphire Black on Black 08 e65 750i Alpine white, Sport Package
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