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11-19-2017, 09:54 AM | #45 | |
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He is from Malaysia . I think meanwhile he just dumped the car . NOTE: From his statistics on his personal page , this was also his last post...
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03-08-2018, 10:41 PM | #46 | |
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Did you end-up replacing the rod bearings and/or switching back to TWS? Did the "rattle" sound from Cwleo's video you had go away after? Thanks! |
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03-15-2018, 03:13 AM | #47 | |
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Nope... am still around and i still have my car. BTW... the video i posted isn't my car. Fortunately my rattle aint so bad. I can't remember where i found the video but it represents all our problem. Last edited by Cwleo; 03-15-2018 at 03:19 AM.. |
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03-15-2018, 03:16 AM | #48 | |
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Conrod bearing issue is highly unlikely. I have changed mine recently and it did nothing to the help the rattle. Currently the rattle has reduced significantly since the spark plug change but it is still there and can be reproduce under load eg low gear hill climb. My E90 is a 10/09 car and also has its DME software updated. However, it did nothing to help with the rattle too. |
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03-27-2018, 01:42 AM | #49 | |
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post #42 http://www.m3post.com/forums/showthr...=694148&page=2 I read this member talking about his "engine detonating when hot" & how changing the LPS fixed everything. Last edited by Aviato; 03-27-2018 at 02:09 AM.. |
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04-11-2018, 10:21 PM | #50 | |
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Thanks for this update. I havent changed my LPS yet so this could potentially be a lifeline to finally solve the issue.
Has anyone else tried changing LPS? Quote:
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04-16-2018, 01:34 AM | #51 |
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Bump, interested to see if anyone else has tried this remedy as I have the same issue. Always some type of cracking/rattling noise under higher gear load esp on a hill
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05-15-2018, 08:29 AM | #52 | |
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Any other success stories with the LPS swap?
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05-15-2018, 09:18 AM | #53 | |
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Drives: 2011 E90 M3,1994 Euro E36 M3/4
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05-15-2018, 04:18 PM | #55 | |
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I have the same knocking sound described by everyone - easily replicated in high-gear/lower RPM situations when loading the engine, both on the street and the highway. And like many owners, my car has never threw a code. Mike Benvo said most S65 M3s he's come across do this to a certain extent, some more so than others, and mine is one of the worst case he's seen. He took a phone clip once, just driving down the street leaving the DCT in D mode which upshifts sooner in lower RPM range, and it was knocking like a mini machine gun. Over the years I have tried putting in new plugs (at least twice) and new coils, each attempt would alleviate the symptom, but not completely solve it. Then the knocking would return and progressively get worse again; I can also feel the engine would become less refined during harder/WOT pulls. This happened on both stock ECU mapping as well as BPM's Stage 1 software. My fix (for now, anyway) is I took Benvo's offer and let him further adjusted the timing a little bit. I'm no engine expert so don't know exactly what he did, but so far the revised ECU mapping has worked very well, almost 99.9% knock free, and the engine is butter smooth once again through most of the rev ranges I travel in (<7K). Will continue to troubleshoot this though. Next up is to replace the O2 sensors. If I ever find a fix will report back.
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05-16-2018, 09:09 PM | #57 |
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This sounds like pre-ignition rattle associated with poor fuel quality/ lower octane.
just food for thought.
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06-18-2018, 11:15 PM | #59 | |
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Nevermind
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07-18-2018, 08:39 PM | #60 |
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Does anyone think that this rattle may be coming from the gearbox instead of engine bay? the sounds seem to be emanating at the driver position rather than upfront in the engine.... just a thought.
i have used an octane booster to up it to about 100ron but sound is still there. and also noticed the sound is more prevalent on a hot day. mystery continues.... |
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06-14-2019, 10:45 AM | #61 |
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It is VANOS related
Old thread, but 100% certain that in my case, this was caused by the rattling of the drive pins on the VANOS high pressure oil pump.
As has been well documented, the E46 M3 has an issue with the drive pins and engagement holes that allow the exhaust cam to drive the high pressure oil pump used for the VANOS system. My 2005.5 E46 M3 had 110K on it (all miles were babied and not raped) with the engine exhibiting exactly the issues described (rattle between 2000 and 3000 - peaking at 2500) when driven under load in 6th. One day the rattle changed (became louder with a bad flutter). I replaced the belts, tensioners and the viscous fan clutch (needed doing anyway) with no change in noise. Then turned my attention to stripping the VANOS and there it was, one of the drive pegs on the VANOS pump had sheared. Managed to pull it out before it dropped into the timing gear chain. I replaced the oil pump drive sprocket, the oil pump filter and all VANOS teflon seals. I had the pump impeller machined with two smaller holes at 90 degrees and BINGO, rattle stopped almost completely. My advice to you: if your engine rattles between 2000 and 3000 in 6th, rebuild your VANOS now before you shear the pins on the oil pump which has the potential to grenade your engine. I was lucky, I hope you are too. Marc |
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08-24-2019, 10:47 PM | #62 | |
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