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#1
02-28-2018, 01:45 PM
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suspecting an exhaust leak
I've changed the oil to castrol 0w40 so it's not the oil, not a timing chain noise too.. similar to valve lifter knock.. not sure if it's vanos since revving the engine doesn't make a rattle noise.. https://www.facebook.com/pg/Bmw-e53-2508322126058762 
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#2
02-28-2018, 02:02 PM
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Let's hear the sound. Does it go away after 90 seconds?
Sent from my iPhone using Tapatalk Pro
__________________
2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#3
02-28-2018, 03:50 PM
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An audio clip would certainly help.
Maybe the secondary air pump that starts during cold starts to help warm the catalysts faster... or something related. There is a valve and a couple of vacuum hoses associated with that pump as well. As for the exhaust manifold... my experience is on E46's, but the nuts are really fun to get to with the engine in situ. Also, at least half of the studs will pull out with the nuts. If it ends up being a gasket further down the line... they are also fun to get at and remove since they are usually fused due to corrosion. Order new ones before starting the job once you locate the leak (if it turns out to be an exhaust leak).
__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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#4
02-28-2018, 05:10 PM
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I'll try get an audio clip next time, will a failing/failed SAP cause a check engine light ?
I have a navigator that has an exhaust leak and it's a PITA to remove those studs.. they break and you have to extract them out.. not that fun... https://www.facebook.com/pg/Bmw-e53-2508322126058762
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#5
02-28-2018, 06:14 PM
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SAP that is failing makes a horrible sound similar to a failing bearing on a water pump or idler bearing: it shuts off with a switch at 90 seconds. It is absolutely obvious if it's working but badly. No code if noisy like my wife's but my understanding is yes code once fails.
SAP is where I was going with asking about the sound but I didn't want to cloud judgement. SAP is very obvious part just aft of the starboard headlight. For 90 seconds at start it blows like hell and when the bearing goes it sounds like hell Sent from my iPhone using Tapatalk Pro
__________________
2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#6
02-28-2018, 10:03 PM
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I tried getting an audio after work but it was 54F outside and the noise quickly went away, never got the chance to take the audio when I reach the front of the hood. Does the SAP behave the same way during warmer weather?
https://www.facebook.com/pg/Bmw-e53-2508322126058762
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#7
02-28-2018, 11:41 PM
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SAP is louder when cold on my wife's car.
Sent from my iPhone using Tapatalk Pro
__________________
2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#8
03-01-2018, 11:18 AM
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Quote:
https://www.facebook.com/pg/Bmw-e53-2508322126058762
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