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      10-29-2012, 05:37 PM   #1
Not a Diesel!!!
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N53 330i. That Bad?

Hello,

Was looking to get a touring & my process generally starts at 335i and goes through every model to the D3 listing pro's & cons.

Anyway as I do 8k per year with a reasonable amount of town driving I thought I would go for petrol.

330i

Then I saw that the emmisions & economy inproved in 2008 & thought thats the one for me.

Then i worked out that this was N53 engine..... Then I scared myself with HPFP, Coils, Injectors etc. Multiple Times.

Are they really that bad?
Is it just a few cars?
Is there still no fix to the root cause?
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      10-29-2012, 05:39 PM   #2
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My current French car has been the model of reliability over the last 3.5 years.

I dont want to go German & have my wallet emptied by a dealer I get on first name terms with.

I had an E30 M3 & E36 328 Sport in the past without issue.
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      10-30-2012, 02:48 AM   #3
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How old is the car you are looking to get? If it's within the warranty period then definately worth getting!

If it's through a main dealer, you would get a years warranty anyway and would most likely be able to extend it at a reasonable price depending on mileage.
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      10-30-2012, 08:50 AM   #4
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Good luck getting a N53 330i Touring! They sold very few and BMW canned the 330i E90 and E91 in early 2009.
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      10-30-2012, 09:58 AM   #5
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They seem to have generally solved the issues. Mine is an 08 N53. Had quite a few issues 2 years ago with 3 fuel pumps, injectors and coils. Since then over the last year and a half i've had no issues at all. It is a good all round motor with power, noise and reasonable running costs.
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      10-30-2012, 03:17 PM   #6
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Its a 2008 car with 56k on it.

Had a look at the weekend.

From a non-franchised dealer.

Does that mean they got uprated components to fix the problem?
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      10-31-2012, 04:24 AM   #7
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Yes i believe so. Best bet is to ring BMW customer services or your local dealer to make sure the car has had all the necessary recall work carried out i.e coils etc. On that mileage though you would asume it should be running fairly well....
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      10-31-2012, 05:00 AM   #8
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I would be very sure you were buying an N53 before any money changes hands. Just off the top of my head, the N53 engine wasn't in the E91 in 08. Double check the CO2 levels on the DVLA car tax website.

As far as i can remember (others feel free to say if i'm wrong), the N53 came into the E90/E91 when it was facelifted in Sept 2008, meaning all cars with it will have to be at least a 58 plate onwards. Of course what it says on the numberplate isn't always true, because it's the build date which is important, rather than the date registered.
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      10-31-2012, 08:31 AM   #9
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N53 was in the coupe from September 07, not sure about the rest but presumably they were all from the above date. Best place to look is on the drivers side door pillar label where it will say N53 if it is.
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      10-31-2012, 08:48 AM   #10
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Mine was built in Sept 07 and registered Dec 07 and is N53, despite being pre-LCI bodyshape. Look at the info plates on the car and the V5 to be sure - I find that most if not all websites that list MPG/CO2 etc are wrong for my car, many keep the pre-LCI pre-efficient dynamics figures for many years after the engines changed!

Mine had it's fair share of issues but it was all coil and injector related - since they were all changed (which is about 40k miles) it has been fine bar one random incident of engine overheating. If buying an N53 I would basically want to know the coils and ideally injectors had all been changed for the amended items. The BMW warranty is excellent peace of mind in this regard. The engine does seem quite a bit more economical than the previous one and 179 g/km is rather good for a 272 bhp petrol 6 auto estate from a few years back...

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      10-31-2012, 03:14 PM   #11
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I checked the door plate to see if it was a N52 or N53 and was surprised to see N53. I to had assumed it was a N52 hence I had not read up on it much before looking.

I then came home to do some research having this doubt that the N53 was problematic.

The other point is its a lease + 1 owner so the last owner only had for a year. Makes me wonder why he changed it. Thats the problem with a garage you cant sound out the owner.

I to though the highish miles would mean if it was going to have any problems it would have had them by now.
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      10-31-2012, 03:15 PM   #12
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As its not from a BMW dealer it will have a non-BMW warranty.
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      10-31-2012, 03:22 PM   #13
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So when you mention ammended items did BMW have a revised unit to fit.

When you search it seems that some people had multiple occasions of coils replaced as if BMW were doing like-with-like and then them failing again.

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      11-01-2012, 05:19 AM   #14
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There were revised bosch coils which were recently applied to various cars when they went in to dealer for work.

Best bet ring a dealer and they will tell you if they have or haven't been replaced recently.
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      11-01-2012, 04:15 PM   #15
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Is it the same issue the 320i had?

The Sticky at the top seemed to suggest the 6 cylinder cars were less prone to failure.
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      11-09-2012, 03:32 PM   #16
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Quote:
Originally Posted by Rich Jones View Post
They seem to have generally solved the issues. Mine is an 08 N53. Had quite a few issues 2 years ago with 3 fuel pumps, injectors and coils. Since then over the last year and a half i've had no issues at all. It is a good all round motor with power, noise and reasonable running costs.
They haven't solved the inlet valve carbon build up issue - mine puts out less than 250bhp
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      11-11-2012, 09:47 AM   #17
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Do you drive yours hard and give it a good blast regularly?
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      11-11-2012, 02:10 PM   #18
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Quote:
Originally Posted by Rich Jones View Post
Do you drive yours hard and give it a good blast regularly?
I'm not sure driving style has much to do with it as it seems to affect the vast majority of the N53/4s.
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      11-15-2012, 03:49 PM   #19
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So id the N52 a better bet than the N53 in reliability terms?
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      11-16-2012, 07:08 AM   #20
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Quote:
Originally Posted by Not a Diesel!!! View Post
So id the N52 a better bet than the N53 in reliability terms?
That was the impression I got from reading on here before buying my N52-engined 330i. Suited me as my budget didn't stretch to a decent N53-engined model. I'm just putting up with the worse fuel economy and higher road tax.
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      11-16-2012, 04:25 PM   #21
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Quote:
Originally Posted by a11y View Post
I'm just putting up with the worse fuel economy and higher road tax.
I'm not sure that the economy is worse
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      11-16-2012, 04:27 PM   #22
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just out of interest my 330i is an N53 and it was registered in june 07
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