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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Possible issues N54 335i



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      02-05-2019, 11:58 AM   #1
x77md
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Post Possible issues N54 335i

Hi all,

Itís been 3 months since i bought my 2008 335i (N54) manual 68K miles. Iíve had a major service done at a Indy bmw specialist where spark plugs & coils were swapped, engine oil etc the usual stuff. The previous owner was not using the car and it was pretty much sat in the driveway and warmed up every week or so, and in the first week of ownership i had a CEL come up. Took it back to the bmw specialist and iirc he pulled up vanos codes & low boost pressure but thought it was likely due to the fact the car was sat around for some time. He cleared the codes told me to monitor it & suggested a walnut blast to have the car running a bit smoother. The last 2 months the car has been running Ok, no CEL, no engine oil lights, nothing funky coming up on the dashboard just the car was a bit hesitant on acceleration but that reduced after the BMW blower and battery line recall. Fuel efficiency has dropped (16/17mpg) - £80-£100 a month (V-Power only) which isnít bad compared to my previous 1.4 golf at £60/£70 a month + Iím not expecting great fuel efficiency with a 3L for mostly short journeys. Iíve experienced rough idles with intermittent Ďshakesí or Ďgapsí on cold starts - something Iíve been told a walnut blast will sort out. Recently Iíve also noticed increased smoking at a standstill and from what Iíve read looks like a sign for new valve stem seals. I queried injectors with the garage but theyíve said there was no problem with them and the mechanic thinks the example Iíve got is a good example overall.

Just today, as I was driving away from standstill (2-2.5krpm) I noticed a leaking clearish liquid coming out of the right exhaust pipe - It doesnít smell like fuel and looks like water but is that normal?

Given this and now that Iíve Finally got some free time away from work, Iím now looking to finally get the walnut blast done along with replacing the valve stem seals if they are indeed the cause of the smoking at standstill. From what Iíve described above is there any other maintenance or parts I should be looking to replace (other than the whole car lol)? Iím bone stock right now and Iíd rather have the car running safe and good stock before I tune the engine or get DPs. I love this car, Iím absolutely in love with the N54 engine and I want to make sure sheís all good before I start modding.

Sorry for spewing out an essay

Cheers
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      02-05-2019, 01:30 PM   #2
Juz5i
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Hi mate,

Iíve got a 57 plate E92 335i.
I remember going through similar experiences when I first got mine. (Good few years ago now)

Had a very slight rough idle now and then.
And sometimes smoke at standstill.

You know what I did in the end??
......nothing!!

I only use the car for short journeys with a decent blast once in a while.
I was on the verge of booking in a walnut blast and change coil packs etc. But I held off for a while. Now I either donít notice the slight lumpy idle now and then or itís gone. Plus a lot of people say these cars always give a little wobble sitting at idle and it doesnít matter what you change.

Granted Iím sure a walnut blast will do your engine some good but Iím holding off for now as I have no issues with how she runs from day to day. The smoke now and then I believe is just water evaporating from only doing short journeys.
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      02-05-2019, 05:31 PM   #3
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I am really curious, do any of you guys with rough idles at cold notice any smell of petrol when it gives you the shakes? Because I do on mine and I've been told it's leaky injector(s) and that it's pretty bad to run it like this for too long...

Quote:
Originally Posted by Biginboca View Post
On the direct injected n54 when the rod bearings have gone out the cause has frequently been traced back to bad injectors leaking fuel, and that fuel contamination of the oil resulted in spun bearings.

So if the N53 is like the n54 then not fixing the leaky injectors could cost you a lot more than a spark plug, it could cost you a motor replacement.

Thread here: https://www.e90post.com/forums/showt...php?p=24336688
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      02-06-2019, 02:13 PM   #4
x77md
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Quote:
Originally Posted by Mircea View Post
I am really curious, do any of you guys with rough idles at cold notice any smell of petrol when it gives you the shakes? Because I do on mine and I've been told it's leaky injector(s) and that it's pretty bad to run it like this for too long...




Thread here: https://www.e90post.com/forums/showt...php?p=24336688
I donít really smell petrol during a rough idle at the moment, I do remember having a smell of petrol and a burning smell in the car prior to having the BMW recall work done after that everythingís been smelling fine in the cabin.
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      02-06-2019, 02:18 PM   #5
x77md
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Quote:
Originally Posted by Juz5i View Post
Hi mate,

Iíve got a 57 plate E92 335i.
I remember going through similar experiences when I first got mine. (Good few years ago now)

Had a very slight rough idle now and then.
And sometimes smoke at standstill.

You know what I did in the end??
......nothing!!

I only use the car for short journeys with a decent blast once in a while.
I was on the verge of booking in a walnut blast and change coil packs etc. But I held off for a while. Now I either donít notice the slight lumpy idle now and then or itís gone. Plus a lot of people say these cars always give a little wobble sitting at idle and it doesnít matter what you change.

Granted Iím sure a walnut blast will do your engine some good but Iím holding off for now as I have no issues with how she runs from day to day. The smoke now and then I believe is just water evaporating from only doing short journeys.
So this must be early 335 ownership syndrome or something lol

Guy at the garage told me something similar about these engines running a bit rough and noisy so thatís good to hear! I probably will go through with the walnut blast seeing as the nearest place to me is offering it for only £250 and Iíll just get it done as Iíve only heard good things about it
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      02-06-2019, 05:41 PM   #6
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Yeah to be honest Iíd probably get it done for £250. It was more £500+ when I was looking a few years ago. Where is that by the way?

The blast might smooth it right out for you. Worth a go isnít it. Just let us know the outcome if and when you do mate.

When I next take mine out Iíll see if it still does it occasionally or not because Iím honestly not sure if it does anymore or Iíve just become so used to it.
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      02-06-2019, 05:57 PM   #7
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Itís injectors 100%. The car stumbles on cold start because fuel leaks and pools when the car is sitting. Pull the spark plugs after the car is sitting and see if fuel is on them. Speaking from experience.
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      02-07-2019, 02:44 AM   #8
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Quote:
Originally Posted by msjt View Post
Itís injectors 100%. The car stumbles on cold start because fuel leaks and pools when the car is sitting. Pull the spark plugs after the car is sitting and see if fuel is on them. Speaking from experience.
But then where's the un-burnt petrol smell when starting it from cold?
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      02-07-2019, 07:28 AM   #9
x77md
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I believe itís £250-£350 for the walnut blast at PMP cars in Nuneaton. Iím probably going to go for that to see if it makes a difference, the car doesnít really judder massively just a few minor ones intermittently and itís not even all the time. Makes sense to try the cheaper option before forking our 1K on injectors that may or may not even resolve it!
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      02-07-2019, 08:29 AM   #10
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It could also be the vanos solenoid. If it's running rough at idle on cold it will likely start getting worse so maybe easier to pin down...
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      02-07-2019, 12:28 PM   #11
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Quote:
Originally Posted by Sxanth View Post
It could also be the vanos solenoid. If it's running rough at idle on cold it will likely start getting worse so maybe easier to pin down...
Maybe youíre right... read a few stories of vanos solenoids being the reason behind rough idles & engine hesitation and lumpiness. Do you know roughly how much replacing them would work out to?
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      02-07-2019, 12:45 PM   #12
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Quote:
Originally Posted by x77md View Post
Quote:
Originally Posted by Sxanth View Post
It could also be the vanos solenoid. If it's running rough at idle on cold it will likely start getting worse so maybe easier to pin down...
Maybe you’re right... read a few stories of vanos solenoids being the reason behind rough idles & engine hesitation and lumpiness. Do you know roughly how much replacing them would work out to?
Quote:
Originally Posted by x77md View Post
Quote:
Originally Posted by Sxanth View Post
It could also be the vanos solenoid. If it's running rough at idle on cold it will likely start getting worse so maybe easier to pin down...
Maybe you're right... read a few stories of vanos solenoids being the reason behind rough idles & engine hesitation and lumpiness. Do you know roughly how much replacing them would work out to?
Hi friend, what I'd do before thinking about replacing them is cleaning them. After I bought mine this last summer I ran into bumpiness and VANOS codes upon pushing the car. This wasn't very surprising considering they'd let the car sit and driven on 6k miles in almost four years. The oil hadn't been changed on account of the mileage not triggering a change indicator. After taking the solenoids out I cleaned with with brake cleaner at the same time as changing the oil and was able to negate codes and hard idles.
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      02-07-2019, 05:55 PM   #13
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Yep a clean & swop around of the vanos solenoids is normally the first point of call on these. Start with cheapest/easiest options first then go from there.

But I remember a thread on here of somebody chasing this issue till it drove him mad. After lots of coin spent and parts changed he still had the occasional slight jumpy idle. Which isnít even really an issue at all.
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      02-10-2019, 12:51 AM   #14
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Air leaks in the inlet/breather system can produce similar symptoms, mine was a cracked cam cover. It was revealed by smoke testing the inlet (dyed smoke is blown in and can be seen clearly from any leaks).
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