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yak52 yak52 is offline
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Default 05-10-2016, 07:49 AM

Hi guys, hate to say it, but the problem is still there. Car still smokes like crazy on decel and initial acceleration. I purchased the car from him and am starting to wonder what I got in to! If any of you know Jake, he's ridiculously honest and from the little I know of him, a super genuine person: top notch. I'm brand new to the N54 and knowingly took a huge gamble, but I enjoy a good challenge. My background is primarily w/ Mitsu 3000gt VR4's, as well as jeeps, rat rods, etc. I have a lift and am in no huge rush to fix. This luckily isn't my DD (yet), and I'm not normally a forum poster, but looks like I'll need all the help I can get as Jake DEFINATELY knew what he was doing. I'm in the middle of a kitchen/whole house remodel with a baby expected in 3-4 weeks, so I might be sporadic, but I'll try to keep the updates rolling.

Not too sure where to start actually. Doing my due diligence. Current thoughts were to pull turbos and check for damage along w/ VSS inspection. Any suggestions? The oil is pouring out somewhere. Feel like it should be obvious.
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ms335i ms335i is offline
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Default 05-10-2016, 07:55 AM

I'm so fffffin confused. What the hell happened?
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bigdnno98 bigdnno98 is offline
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Default 05-10-2016, 07:56 AM

Me too. So you bought the OPs car? It has newly rebuilt Hexons on it?


2011 335is DCT, FBO
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yak52 yak52 is offline
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Default 05-10-2016, 08:35 AM

Yes, I bought OP's car, he gave me same story as on here and claimed it had the new Hexons on it, and I believe him.
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Default 05-10-2016, 08:52 AM

Quote:
Originally Posted by yak52
Yes, I bought OP's car, he gave me same story as on here and claimed it had the new Hexons on it, and I believe him.
Ah ok. So you're burning oil and don't think it's the turbos? Have you pulled the DP off to look at the turbine housings or inside of the DP for oil?


2011 335is DCT, FBO
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bigdnno98 bigdnno98 is offline
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Default 05-10-2016, 08:53 AM

Has the car been compression and leak down tested? Any misfires?


2011 335is DCT, FBO
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yak52 yak52 is offline
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Default 05-10-2016, 10:08 AM

Car runs pretty good. PO said that it was making valvetrain noise, however, I'm not accustomed to the noises of this car so I cannot comment. I'll try to take video.

I literally bought car last night and have not had a chance to do anything. Not sure I will tonight either, but will try.

Symptoms:
-Valvetrain noise (subjective)
-heavy smoke on decel, @ idle, (could be partially water vapor, but def. smells like oil) and right after decel
-no misfires, no CEL currently
-Having never driven the car before, don't know how it should feel, however, it pulls hard and drives nice as far as I'm concerned. Drove it home ≈40-45 miles last night, and other than subjective noise and smoke, no issues. Didn't get on it hard at all and prob won't until I at least suspect what the issue is.

Thanks in advance for any assistance you guys can offer.
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suspenceful suspenceful is offline
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Default 05-10-2016, 11:06 AM

Quote:
Originally Posted by yak52
Car runs pretty good. PO said that it was making valvetrain noise, however, I'm not accustomed to the noises of this car so I cannot comment. I'll try to take video.

I literally bought car last night and have not had a chance to do anything. Not sure I will tonight either, but will try.

Symptoms:
-Valvetrain noise (subjective)
-heavy smoke on decel, @ idle, (could be partially water vapor, but def. smells like oil) and right after decel
-no misfires, no CEL currently
-Having never driven the car before, don't know how it should feel, however, it pulls hard and drives nice as far as I'm concerned. Drove it home ≈40-45 miles last night, and other than subjective noise and smoke, no issues. Didn't get on it hard at all and prob won't until I at least suspect what the issue is.

Thanks in advance for any assistance you guys can offer.
I saw it on Craigslist and you got it for a steal. Not the cleanest car in the world, but at $4500... I think you made out pretty well with all the mods.

I would definitely make sure the motor is in good condition before doing anything else. If the new turbos are installed, I would guess you've got a problem with one of the cylinders.


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yak52 yak52 is offline
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Default 05-10-2016, 11:16 AM

I'll definitely be pulling the plugs and doing a compression and leak down test to determine engine health. Will share results.
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IBND335i IBND335i is offline
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Default 05-10-2016, 11:47 AM

Do you have an oil catch can?


2007 e92 auto
Jb4/dci/e85blend/e85flash/fuel-it stage2
12.53 @ 114
after ***: 11.92 @ 117.98
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yak52 yak52 is offline
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Default 05-11-2016, 05:31 AM

No OCC currently. Won't have a chance to look at the car until the weekend
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Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
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Default 05-11-2016, 07:17 AM

Damn, the n54 wears down another


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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mojo20032004 mojo20032004 is offline
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Default 05-11-2016, 07:38 AM

Are you guys Pre tensioning your wastegate before install and priming the system? I was one of the first to get a hexon kit in Chicago, and I'm at 94k miles, 10k on the turbos and knock on wood no smoking issues at all. Fbo with aftermarket exhaust, just get condensation on cold mornings, warmer days I just smell e85😎. Also I beleive oil has a major roll in how everything is lubricated. I also switched to a 5w40 shell diesal oil and feel like since ours cars run so damn hot, it needs a oil that's meant for hot applications


2007 e90 335i
Hexon turbos
Fbo with Cpi tuned at e55
Jsr Custom tuned
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yak52 yak52 is offline
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Default 05-11-2016, 07:39 AM

Update: Couldn't resist, checked turbos, look brand new w/ no issues. With all OP did to diagnose and amount of smoke and noise, along w/ his background, I'm going to pull engine and replace. Will be a while before I make any serious progress, but will try to post.
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Default 05-11-2016, 08:20 AM

Quote:
Originally Posted by yak52
Update: Couldn't resist, checked turbos, look brand new w/ no issues. With all OP did to diagnose and amount of smoke and noise, along w/ his background, I'm going to pull engine and replace. Will be a while before I make any serious progress, but will try to post.
Please compression and leak down before you pull it. For the sake of the forum I'm interested to see the results.


2011 335is DCT, FBO
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suspenceful suspenceful is offline
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Default 05-11-2016, 08:37 AM

Quote:
Originally Posted by bigdnno98
Please compression and leak down before you pull it. For the sake of the forum I'm interested to see the results.
This. The PCV systems in these cars can be finicky. Don't pull it without verifying that it's bad first.


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viprez586 viprez586 is offline
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Default 05-11-2016, 08:43 AM

Compression test was done a few weeks ago. 170psi across the board.

Look at my first post.

As i Discussed with the buyer. I'm sick of dealing with the car. I did my work. Spent ~$4k on it in the last month. It was time to move on. I sold it at a fair price and picked up a G37X for the wife to drive. I just can't be working on this car every weekend when its a DD.
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Default 05-11-2016, 08:50 AM

Quote:
Originally Posted by viprez586
Compression test was done a few weeks ago. 170psi across the board.

Look at my first post.

As i Discussed with the buyer. I'm sick of dealing with the car. I did my work. Spent ~$4k on it in the last month. It was time to move on. I sold it at a fair price and picked up a G37X for the wife to drive. I just can't be working on this car every weekend when its a DD.
Compression can be good and it still have problems, thus the need for a leak down. If leakdown is good also, no need to pull the engine. It's a problem elsewhere.


2011 335is DCT, FBO
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viprez586 viprez586 is offline
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Default 05-11-2016, 09:06 AM

Quote:
Originally Posted by bigdnno98
Compression can be good and it still have problems, thus the need for a leak down. If leakdown is good also, no need to pull the engine. It's a problem elsewhere.


If compression is good there is no need for a leakdown test as a leak down test is a diagnostic procedure following abnormal compression readings.

In fact the variance of compression in the n54 is 2 bar/29psi which is quite high considering most engines is 10-15psi.

A leak down tests helps pin point WHERE the compression is bleeding off. IE: Rings, valves, or cracks in coolant/oil passages.

EVERY engine has leakdown. 10% IMO is acceptable because it bleeds past the rings.


Here's a link to educate yourself a bit more.
https://en.wikipedia.org/wiki/Leak-down_tester
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