BMW M3 Forum (E90 E92) - Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications https://www.m3post.com/forums/ Discuss modification of these components. en Sat, 15 Aug 2026 06:45:36 GMT vBulletin 60 https://www.m3post.com/forums/multisite-style/m3post/misc/rss.jpg BMW M3 Forum (E90 E92) - Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications https://www.m3post.com/forums/ Intake/Front Side Noise - Metallic Air Ticking - Exhaust Leak? https://www.m3post.com/forums/showthread.php?t=2252268&goto=newpost Thu, 13 Aug 2026 06:11:41 GMT This metallic air ticking noise is driving me nuts and I haven't located it anywhere.

It comes hard during warmup, then as the rpm drops and settles, it largely goes away for a moment and then coming right back. And it goes along when you accelerate, clearly audible even when driving, in a tunnel or close to a wall. This in my mind really "spoils" the whole acoustic experience of my E92, making it a bit "unclean" and "unsolid", while I'd really prefer to having my focus on the intake and exhaust.

Found this video from 5 years back on YouTube which perfectly matches with my situation. It points the issue to the manifold leak, but I haven't been able to locate it on mine yet. And there's no followup there. Throwing it out here to gather more experiences!



I bet this is probably not a rare occurrence. Might be a simple fix after all. But would really appreciate people sharing a bit more! ]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications yillan_h https://www.m3post.com/forums/showthread.php?t=2252268 High Flow Cats https://www.m3post.com/forums/showthread.php?t=2252142&goto=newpost Wed, 12 Aug 2026 02:50:27 GMT Still learning here so please don't crucify me. I am new to the e90 world.
Bought a 2011 e90 as a project with 80k miles on in. The car had a valvetronic cat back. I replaced the mid pipe with Macht Schnell pipe with PLM HFC. CEL i can deal with but the smell is horrible. My F90 only has two HFC cats left and there is no smell at all. Any recommendations for other HFC?

TIA
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]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications greentrbo95gst https://www.m3post.com/forums/showthread.php?t=2252142 AN-10 lines and Oil Filter Housing https://www.m3post.com/forums/showthread.php?t=2252056&goto=newpost Tue, 11 Aug 2026 14:05:38 GMT I searched but couldn't find anything. Has anyone had luck setting up AN-10 lines to the oil filter housing? Doesn't seem like there is enough room to get the adapter in there flush. I'm trying to setup an accusump and this is the last obstacle I got (I think!)

If anyone has had success please post pics and details!

Thanks,

Rubin ]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications former 240 s14 https://www.m3post.com/forums/showthread.php?t=2252056 Oil Level Sensor Inconsistency https://www.m3post.com/forums/showthread.php?t=2251782&goto=newpost Sun, 09 Aug 2026 12:33:21 GMT I've been getting some inconsistent readings from my oil level sensor over the past few days which have me a bit concerned.

Prior to taking the car away on a trip for the weekend it was reading at one notch below maximum (250ml below full), so I added a quarter of a litre to bring it up to max.

After driving the car, the level didn't go to max, but instead dropped to the half way mark (500ml below full). I chalked this up to the classic weirdness from these sensors and kept driving. Despite me forcing many re-checks with the BC button, the level remained at the half way mark all weekend until Sunday afternoon while I was driving home, when it began reading at the full level again.

Great I thought - the sensor has finally re-calibrated itself and now it's reading correctly.

Sadly, this was short lived, as the sensor has since gone back to reading at the half way mark.


I am pretty accustomed to the way these sensors behave as I also have an E63 M6, so I know their quirky behaviour, however this seems a bit more unusual than anything I've seen before.

The car has no codes and upon running a check on the sensor in ISTA the software says the sensor is ok and it reads out the oil level in mm with no issues.

Should I replace the sensor as a precaution (at BMW's outrageous price) or give it some time and see if it stabilises? ]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications TassieBMW https://www.m3post.com/forums/showthread.php?t=2251782 2013 bearings and Injectors ?! https://www.m3post.com/forums/showthread.php?t=2251491&goto=newpost Fri, 07 Aug 2026 02:26:23 GMT Hey Guys, just bought a 2013 Comp 6 Speed build in april 2013, it got 40k on the odo no TA or RB records, wondering if I should change the RB? since I have heard that bmw changed the bearings in 2013? also I have read about the injectors failures, I can get some Bosch ones for less than $40... Hey Guys,

just bought a 2013 Comp 6 Speed build in april 2013, it got 40k on the odo no TA or RB records, wondering if I should change the RB? since I have heard that bmw changed the bearings in 2013?


also I have read about the injectors failures, I can get some Bosch ones for less than $40 bux, so wondering If I should replace them too?! ]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications advent1 https://www.m3post.com/forums/showthread.php?t=2251491 Another idle thread https://www.m3post.com/forums/showthread.php?t=2251342&goto=newpost Wed, 05 Aug 2026 23:54:35 GMT symptoms : 1. Vibration felt in steering wheel at idle. Ac off. Idle speed is 650ish +-20. Target speed is 650. 2. Vibration felt in brake pedal with foot resting on it. Ac on. Idle speed at 780ish +- 20. Target speed is 780 3. No codes 4. no/little vibration when driving. Recent Work (last... symptoms :
  1. Vibration felt in steering wheel at idle. Ac off. Idle speed is 650ish +-20. Target speed is 650.
  2. Vibration felt in brake pedal with foot resting on it. Ac on. Idle speed at 780ish +- 20. Target speed is 780
  3. No codes
  4. no/little vibration when driving.
Recent Work (last 1000miles) that may be applicable :
  1. updated Bosch fuel pressure sensor with adapter ( possibly slightly overtorqued (+- 2-3nm - oops )
  2. fuel tank vent valve
  3. New AC compressor, Alternator, PS pump, tensioners, belts.
  4. Vanos Covers ( removed cam bolts to install - torqued to spec )
  5. Injectors
  6. Spark plugs
  7. Bimmerworld engine mounts ( 2000 miles ago. They've given me more nvh but this is new )
  8. NRW Throttle body couplers
]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications sxychubles https://www.m3post.com/forums/showthread.php?t=2251342 4.10 Diff Whine - How to Quiet https://www.m3post.com/forums/showthread.php?t=2251221&goto=newpost Tue, 04 Aug 2026 21:34:23 GMT Has anyone had success with fluid additives during diff fluid service to reduce the insane whine that a 4.10 rear and can cause. Between 2k and 3k rpms at most speeds over 45mph, I want to put a bullet in my skull. The whine is exacerbated by the stiff 95A diff bushings that turn my rear... Has anyone had success with fluid additives during diff fluid service to reduce the insane whine that a 4.10 rear and can cause.

Between 2k and 3k rpms at most speeds over 45mph, I want to put a bullet in my skull. The whine is exacerbated by the stiff 95A diff bushings that turn my rear subframe into a tuning fork. ]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications srv2790 https://www.m3post.com/forums/showthread.php?t=2251221 AutoSolutions SSK / general SSK question https://www.m3post.com/forums/showthread.php?t=2251190&goto=newpost Tue, 04 Aug 2026 15:43:59 GMT Previous owner did an AS SSK in my e92 m3. While I mostly like it, it seems sloppy. Certain gears are clicky going in, but others are not. Furthermore when in gear, the shifter itself has significant left to right slop. While I know this is not an autosolutions ssk issue, looking for help... Previous owner did an AS SSK in my e92 m3. While I mostly like it, it seems sloppy. Certain gears are clicky going in, but others are not. Furthermore when in gear, the shifter itself has significant left to right slop.

While I know this is not an autosolutions ssk issue, looking for help identify the component that would be causing this.

Carrier bushing perhaps? Anyone else had this happen? ]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications srv2790 https://www.m3post.com/forums/showthread.php?t=2251190 Air Pump Bracket https://www.m3post.com/forums/showthread.php?t=2250664&goto=newpost Thu, 30 Jul 2026 17:34:34 GMT Can someone please give me the part number for this bolt. I tried searching on realoem but for the life of me I can’t find it! Can someone please give me the part number for this bolt. I tried searching on realoem but for the life of me I can’t find it!
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]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications charliev68 https://www.m3post.com/forums/showthread.php?t=2250664 Rough start..maybe. https://www.m3post.com/forums/showthread.php?t=2250476&goto=newpost Wed, 29 Jul 2026 00:27:22 GMT Relatively new to the platform so i'm overly sensitive to any new sounds or weird activity. This may be normal but would like to get y'all thoughts on it.

After sitting for 24 hours the car turns over a little rough in my opinion.
I recently changed injectors and spark plugs.

Video:
https://youtube.com/shorts/rqYb7MVkYao?feature=share ]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications sxychubles https://www.m3post.com/forums/showthread.php?t=2250476 Power steering belt- im at a loss https://www.m3post.com/forums/showthread.php?t=2250466&goto=newpost Tue, 28 Jul 2026 23:18:04 GMT Okay... I have read, re read... Looked at diagrams you name it. I feel like a damn moron- but I cannot for the life of me figure out whats going on here.. My car is March of 08 production date (according to ISTA), the door say 4/08.. But has had a questionable maintenance history.. I am pretty sure... Okay... I have read, re read... Looked at diagrams you name it. I feel like a damn moron- but I cannot for the life of me figure out whats going on here.. My car is March of 08 production date (according to ISTA), the door say 4/08.. But has had a questionable maintenance history.. I am pretty sure the engine is the original and not a replacement at least..

So I noticed some squealing and choppy steering at low speeds especially when starting the car and moving it out of the garage.. Along with another laundry list of stuff I was planning to attack. So I ordered the belt and pulleys for pre 5/15/08. It also appeared to me those were the parts on the car.

Well, if you can see by the pictures of how the idler pulley was attached with a non factory bolt, and two washers tucked behind it to keep it from hitting the water pump pulley (washers also dont appear factory, nor something BMW would do).. So I am wondering... did someone possibly convert my car to the newer pump at some point... As you can see from my pics, the belt was routed for a clockwise pump.. BUT- could this all have been converted and the last person that tried to fix this didnt realize and forced it to work with what they had??? I mean would the power steering pumo even work though? To me it seems like that idler pulley is veyr much installed backwards... Which begs my question- are the oil filter housings different? I dont see how they would not be.. The bolt I recieved with my new idler pulley and belts wont even come close to grabbing threads.. I tried to get a picture of the part # for off the power steering pump- but its hard to see 7693 974 121 is one of the numbers but I cant get it to generate anything online..

Anyone have thoughts on this..? I did order the post 5/08 belt and pulley kit too and express shipped it..
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]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications HDdave https://www.m3post.com/forums/showthread.php?t=2250466 Rattle Diagnosis https://www.m3post.com/forums/showthread.php?t=2250166&goto=newpost Sun, 26 Jul 2026 18:17:24 GMT I have a rattle you can hear throughout the linked video most prominently around :30, 1:15 and 1:45. Video here: 0RRY89ZeErE It occurs at low RPM underload, for example if I am in 6th gear at 40mph between 1200 and 3-4K RPM when accelerating. It is much more prominent when it is cold out. It... I have a rattle you can hear throughout the linked video most prominently around :30, 1:15 and 1:45.

Video here:


It occurs at low RPM underload, for example if I am in 6th gear at 40mph between 1200 and 3-4K RPM when accelerating. It is much more prominent when it is cold out. It goes away after the vehicle warms up, but not neccessarily with engine temp, when cold out it occurs for awhile after the oil is at operating temp and when its very hot (90+ F) out it may not occur at all.

There doesn’t seem to be a rattle you can hear outside the vehicle with the windows down, so it doesn’t track perfectly with the cowbell driveshaft noise, but I can’t entirely rule it out. It may also be the CV joint at the diff end of the driveshaft.

It also does not seem to be the dual mass flywheel either, as it goes away when put the clutch down.

The heat shields are all secure as well as the exhaust.

It seems to move around and can seem to come from somewhere in the front left dash, the passenger side door panels, the passenger side B pillar, or from the drivetrain tunnel. It sounds both like a plastic/interior rattle, but also seems to sound like a rotational rattle.

If anyone has any thoughts while I hunt this down that would be great. I can’t seem to find any posts that is exactly on point with this. ]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications oldmanjingles https://www.m3post.com/forums/showthread.php?t=2250166 Throttle actuator replacement - newbie https://www.m3post.com/forums/showthread.php?t=2249745&goto=newpost Thu, 23 Jul 2026 03:05:52 GMT Hi all,

I've bought a 2008 M3 E90 about 9 months ago. It has 185k miles and rod bearings were done at 80k, so had a shop around me do the rod bearings right away.

I put the car in storage for the winter and took it out a few months ago. I started driving it and the car went into limp mode. Scanned it and found out it was left bank throttle actuators. I figured I'd try to do it myself.

When I went in, I've found a few pretty nuts things (i think), but need a sanity check. Zip ties to keep sensors together, air filter housing box not screwed down, phelem not connected to either vacuum line or fresh air hose. Also, the wiring for AC compressor clutch is floating off of the anchor(?). Not sure if that matters. I'm a little worried about putting it back on.

I'm pretty far along removing everything but now need to cut some zip ties on sensors to get it the electrical housing out of the way and get to the throttle actuators.

Do I send the car back to the shop, tell them what i found and ask them to finish it up and clean up the issues? They're a reputable shop. I'm assuming that these issues/items were likely from them when they did the rod bearings, but please correct me if I'm wrong.

Any thoughts? Id love to do this on my own. I ordered more zip ties (just in case).

Thanks ]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications katter77 https://www.m3post.com/forums/showthread.php?t=2249745 ECU Compartment https://www.m3post.com/forums/showthread.php?t=2249629&goto=newpost Wed, 22 Jul 2026 02:27:34 GMT Can someone provide a picture of the Ecu sitting inside its compartment with all the wiring routed in its stock configuration. I took it out but forgot to snap a photo. Can someone provide a picture of the Ecu sitting inside its compartment with all the wiring routed in its stock configuration. I took it out but forgot to snap a photo. ]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications charliev68 https://www.m3post.com/forums/showthread.php?t=2249629 Driveshaft “binding” feeling in reverse? https://www.m3post.com/forums/showthread.php?t=2249409&goto=newpost Mon, 20 Jul 2026 16:29:38 GMT My garage is on a slight incline and I reverse into it so I can get close to the wall. Twice now, I’ve got up the incline portion into the flat garage and as I’m backing in, a huge thump ensues and it feels like I broke something in the rear end. Last night, my brother saw it happen and he said the... My garage is on a slight incline and I reverse into it so I can get close to the wall. Twice now, I’ve got up the incline portion into the flat garage and as I’m backing in, a huge thump ensues and it feels like I broke something in the rear end. Last night, my brother saw it happen and he said the passenger wheel sorta shifted. It’s bad enough that it’s making me not want to reverse. I have a new guibo and center bearing on order, but wanted to see if anyone else had a similar issue. The threads I read didn’t quite describe it this way. Car is DCT. ]]> Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications robbievo https://www.m3post.com/forums/showthread.php?t=2249409