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BMW 3-Series (E90 E92) Forum
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A Buyer/Owners Guide to the N54 engine & the E9X 335i
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01-27-2017, 02:43 AM | #23 |
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01-27-2017, 08:26 AM | #24 |
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The stock chargepipe is known to crack from cheaply made plastic and oil degradation. Mines was cracked and my car was stock.
Last edited by DonDre; 01-27-2017 at 08:26 AM.. Reason: dribble44 |
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01-28-2017, 07:26 AM | #25 |
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Excellent write up! You might want to mention under the section on the water pump, that the pump can sometimes fail without warning and can strand you on the side of the road requiring a tow. Happened to me last year at ~70K miles. So it is best to be proactive about replacing the pump, and not wait for it to fail.
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01-29-2017, 05:59 PM | #27 | |
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Car has 80K - dealer did T-stat around 60K or so - I have to go back and look at records. I am contemplating doing the water pump this spring. It's tough - you read some that got 120K on the water pump, no problem. I have a friend with a 2012 E92 and his failed at 47K. But, like you said, it is a pre-emptive maintenance item. It's not a question of if it fails but when it fails. |
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01-29-2017, 06:26 PM | #28 |
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DonDre - well done! I would love to see extra section added to that guide that will explain how to check for most of these faults on the spot to at least sort out obviously faulty cars from the ones worth looking into further. For example wastegate rattle - should be easy to hear, but I and other noobs need to know if we need to hear it on idle or when pressing gas pedal slightly? Does it happen on cold only?
I also read somewhere that you can quickly and relatively easily pull off hose from oil cooler and see if it's dirty inside with grime, supposedly indicating turbo failures or something - I have no idea how to do it, but noobs and me would like to know about it. I know dealers don't allow you to take the car to a mechnic for inspection, but would it help to bring your own scanner (something like Carly) and scan on the spot for any possible issues (I suspect dealer would reset all faults, but who knows) Also, going by the extended warranty from BMW on HPFP and turbos - as I understand it makes sense to purchase 2010 model with less than 80K miles - so after a thourough mechanical inspection if there is something wrong with HPFP or turbos - you get a chance to replace it under warranty by BMW? I can also imagine myself bringing a cheap $20 boroscope with my cellphone to quickly check something - but I'm not sure if I'll b able to check intake condition or check something through the open oil lid? I suspect I won't be able to see much, but I'm not sure Any other hints to look for - should we look for signs of jb4/mhd installation - if at all possible? Should we stay away from such cars - as I understand higher boost may shorten life of turbos? What about other n54 related issues: like the issues with stock chargepipe cracking - anything else not mentioned yet that is common with n54? |
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01-29-2017, 10:22 PM | #29 | |
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02-21-2017, 09:04 PM | #31 | |
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Especially part about how to do a quick and easy pre purchase inspection - to at least eliminate major issues like wastegate rattle and oil leaks |
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02-25-2017, 11:28 PM | #33 |
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Bumping this because many dumbass noobs are asking these same questions every day.
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03-04-2017, 05:53 PM | #35 |
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Great work, thanks!
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03-12-2017, 10:11 PM | #36 |
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Literally signed up just to thank you for writing this. I'm in the market for one of my dream cars and doing as much research as I can to make sure I get a good one. One question that i don't think was touched on. How long do the turbos usually last? A clean 09 335i with 155,000km just went up in my area and I'm considering making an offer on it. Turbos and hpfp were replaced under warranty at about 65k.
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03-13-2017, 12:30 PM | #37 |
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Its about time someone created this. Great job
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03-13-2017, 03:45 PM | #38 |
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Excellent write up.
Sums up the major issues perfectly. Unfortunately, I speak from experience. In 100k I have had two new turbos, two new water pumps, a new oil pan gasket, a new HPFP and a walnut cleaning. |
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03-15-2017, 04:05 PM | #42 |
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another vote for a sticky
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03-15-2017, 07:39 PM | #43 |
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Stick it!
Also, it's probably worth adding to the guide that - there is a free BMW turbo replacement program (extended warranty) on cars less than 8 years or 82k miles. I feel this is important info - buyer can aim at a 335 falling into this category to avoid big repair bill in case if turbos fail soon after purchase |
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03-15-2017, 09:45 PM | #44 | ||
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