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What is this boiling on my head?
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10-27-2015, 01:49 PM | #24 |
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How about u dip ur finger in and taste it. U will know for sure then..
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10-27-2015, 01:57 PM | #25 |
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30% coolant mix will get you in the range of 220-225*F boiling point. So it's definitely possible for the coolant to be boiling if there happens to be a hotspot near an oil passage or above the combustion chamber.
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10-28-2015, 01:51 AM | #26 | |
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10-28-2015, 06:38 AM | #27 | |
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Also, get that injector out of there ASAP and change your oil. Too many stories of spun bearings from fuel in the oil from bad injectors. |
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10-28-2015, 07:12 AM | #28 | |
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335i e92 TPC 19Ts
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10-28-2015, 10:33 AM | #30 | |
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In regards to fuel, yea probably bad injector, if it's louder then the others its definitely time to change them. Aside from looking at plugs, if you use INPA and check out the rough running section, it looks over all the injectors. It shows a graph that is green and red. My cyl 5 injector happened to be very loud, bu no accident, during cold starts it was exceeding the green in the graph and going into the red, indicating it was out of spec. It doesn't throw a CEL unless it's out of wack for a long period of time, I'm not exactly sure how long but eitherway I'll be replacing that injector sooner then later. Keeping that in mind, with a lazy injector you should take it easy on the wide open throttle. You should also datalog and take a look at your AFR bank to bank and short term fuel trims, you'll likely notice some abnormalities between the 2 banks with a bad injector. Unfortunately on this platform it seems injectors are pro-active maintenance. Waiting for them to fail will be too late. I'm starting to think fresh injectors are needed every 50K miles or possibly even sooner, especially those on index 9 or earlier still. |
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10-28-2015, 11:31 AM | #31 | |
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10-28-2015, 11:34 AM | #32 | |
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You need a K+DCAN Cable. I'll see if I can get a vid later if it interest guys but aside from listening to my injectors and noticing my #5 was louder then others, INPA confirmed it with their "Rough Running" software. I really need 6 new injectors but I don't feel like coughing up $650+ today. |
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10-28-2015, 12:02 PM | #33 | |
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10-28-2015, 12:28 PM | #34 | |
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10-28-2015, 12:36 PM | #35 | ||||
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So much great advice in this post, Jeff, thank you. I honestly don't think this is related to my VCG. The part was installed correctly. I don't see any other leaks. I haven't seen a single leak for the past two months, when I replaced the cover and gasket. This is the first time I'm seeing some oil and only on one of the plugs. The injector sounds like a tractor and the plug smells like fuel. Everything I've read on E90post indicates that's a bad injector. No CEL yet but I'm also pretty observant and I can say with certainty that this sound has gotten louder ever since I put my JB4 G5 ISO in. As always the JB4 exposes the weakest links. I'll be taking it really easy on the throttle till this part is replaced. If I datalog, do you suggest taking it easy there too? No WOT in 3rd like you normally would for logging? You're right on the maintenance part. I'll likely buy a couple of injectors to keep as backups. Hopefully not every 50k though on index 11+.
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10-28-2015, 12:54 PM | #36 |
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I just checked my injectors and they're all 13538616079 index 11. All 6 injectors were replaced 30k miles ago so it's strange that one of them has already gone bad but oh well.
Service bulletin: IMPORTANT: Injectors with index 11 and higher have a different calibration and construction than injectors with index 10 and lower. Due to this difference, the injectors with index 11 and higher and injectors with index 10 and lower cannot be mixed on the same engine bank (i.e., cylinders 1-3 or 4-6). Once a bank of injectors is at index 11 or higher, the “bank set replacement” requirement no longer applies. For index 11 injector failures, only replace the failed injector
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2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs Last edited by N54Society; 10-28-2015 at 01:06 PM.. |
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10-28-2015, 04:11 PM | #37 | |
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I did not say it can't be coolant, I said that the mix would have no bearing on whether it was leaking. In other words, if it is in fact coming from a freeze plug, it would be leaking from there whether you were running water, water plus water wetter or a water/coolant mix. And, btw, race cars all run distilled water plus water wetter (or Motul Mocool) since it's illegal to run antifreeze on the track. This does not make them prone to leak! Google "MDORPHN" if you want to check out my credentials. Neil |
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10-28-2015, 04:18 PM | #38 | |
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Any idea why a 50/50 mix wouldn't also be boiling on the head after a bunch of hard runs and driving to work this morning? I'm just going by my observation. I changed the mixed ratio by adding more coolant and now it suddenly doesn't leak. I hope I don't have to eat these words. Thanks for chiming in.
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2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs |
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10-28-2015, 04:37 PM | #39 | |
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Although I'm not aware of freeze plugs loosening absent freezing, you should make sure the plug is secure. I'd then pressure test the coolant system and bleed it several times (since one time isn't sufficient in my experience). Neil |
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10-28-2015, 04:42 PM | #40 |
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It is definitely interesting that switching the coolant mixture made it stop leaking.
However, I think it may be a temporary fix. MANY of us run a 30/70 coolant/water mix (or less!) without issues. The properties between 30/70 and 50/50 is actually pretty small. This coupled with the fact that it leaked with 30/70 and not with 50/50 leads me to believe that despite it not leaking at this moment, it is probably on the verge of leaking. Getting stuck in traffic on a hot day for example might be enough to set it off. Or just overt time it might start leaking again. I think you found a temporary solution and you should fix the issue once and for all.
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10-28-2015, 07:38 PM | #41 | |
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Still curious whether you did the water pump vent cycle to remove air.
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335i e92 TPC 19Ts
Last edited by Sgop335; 10-28-2015 at 07:47 PM.. |
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10-28-2015, 11:56 PM | #42 | |
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Are you supposed to bleed in between each cycle the pump goes through? In the 12 minutes it stops and goes numerous times. Are you supposed to let air out each time?
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10-29-2015, 06:59 AM | #43 | |
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10-29-2015, 08:22 PM | #44 |
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Guys, it's with great misfortune to announce that my issue has returned. I feel like an idiot right about now, and pretty hopeless. Could it possibly be a bad water pump that is working intermittently? I mean, that should throw a code, right? I have no codes...No overheating. Drove the car to work (22 miles each way). It didn't do this on the way into work because I checked. It did do it on the way back.
I ordered a water pump as a last ditch effort and it arrived today. How can I verify that my water pump is working with certainty? When I bled the system a couple of days ago, I could hear the pump working fine. I'm pretty surprised that no one has seen this before. I don't want to say it but, could it be a head gasket?
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2008 E92 335i 6MT: FBO + MMP Silicone Inlets | Stage 1 LPFP | 335is clutch + MFactory SMFW | Custom BuraQ + MHD tune | 3.5Bar N20 sensor [SOLD]
2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs Last edited by N54Society; 10-29-2015 at 09:41 PM.. |
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