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E60 525i N53 Cold Start Rough Idle - Fault Codes

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Hello fellow forum members, I hope this topic finds you well.

 

I am in need of assistance with my E60.  A few days ago I've noticed that the car started running really rough on cold start. RPM's fluctuate significantly under idle and it seems the car is fighting to keep itself alive.  If left for a moment to go through the initial warm up from "higher" to lower "semi warm" RPM range a yellow check engine light comes on.  On restart however it disappears.   The misfire can be felt if I drive it as soon as it starts it but after the engine reaches optimum temperature everything stabilises and becomes normal; no hesitation, no apparent loss of torque under acceleration. 

 

Last night I ran INPA diagnostics and found the following fault codes:

2A2B DME Mixture Control – Mixture too rich (large deviation) – Mixture adaptation B1214_DI6GEM – SAE diagnostic trouble code P0172 (registered now at 77k miles)

29CD DME: Combustion misfires, cylinder 1 with fuel shut off – SAE diagnostic trouble code P0301 (registered now at 77k miles)

Misfire detection - B1214_MISFIRE3

30E9 DME: Nitrogen oxide catalytic converter, ageing - Low storage capacity – Nitrogen-oxide catalytic converter B1214_D16NOXK – SAE diagnostic trouble code P2000 (registered at 64k miles)

29D9 DME: Misfire at low tank fill level - SAE diagnostic trouble code P0313 (I assume this occurred because fuel level was just below the "notice" phase) - (registered now at 77k miles)

2EF7 DME: Map thermostat activation – Open circuit – Map thermostat B1214_NG6KFK – SAE diagnostic trouble code P0597 (registered at 71k miles)

 

I have been looking after both of my BMW's from servicing and minor repairs perspective.  Major service has been completed on the E60 last year less than 10k miles ago. I've swapped coils around to see whether the misfire will follow to the next cylinder - it appears that it had no impact whatsoever. 

I've added a couple of short videos to dropbox:

 

https://www.dropbox.com/s/gx4hok3h23c6ruh/MOV_0502.mp4?dl=0   

   

https://www.dropbox.com/s/2zj7csdymckr1sj/MOV_0501.mp4?dl=0

 

Please can someone assist in resolving this issue.  Thanks very much in advance. 

 

 

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Sorry, just re read and see you are at 77k.  I would be changing the oxygen sensor and injectors, if you haven't already.  My old N53 always ran rough with less than a quarter of a tank of fuel, never did find out why.

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Thanks for the advice.  No, this car has been fairly trouble free over the last 35k miles and five years of ownership. Other than services 6k-8k miles, rocker cover gasket and battery nothing else has been done.  

 

This could be a silly question but could I get away with swapping, say, cylinder 1 injector with cylinder 2, coding 2 with 1 values and vise versa to see if misfire follows? 

 

I'll also check DISA and MAF.

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Im not too sure if there is any way to check the ccv other than visually...I had a similar issue to yours about a few months and I was really hoping it wasn't the injectors as its roughly £1200-£1500 to sort that  out depending on where you go....but on mine turned out to be the coilpack which is a slightly cheaper fix.

 

If the coilpack did go on yours the rough idle would stay regardless of the car being hot or cold as you mentioned that the issue goes away once the car is up to temperature it does sound like the ccv.

 

With the CCV the pipes perish and air starts going through the pipes which causes the rough idle, if the CCV has gone then you should notice that your filling up oil more often than usual.

 

 

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Jaye60 good point on the coils aspect! I was going to look at the plugs + coils again but given your observation rules that aspect out.  As far as oil consumption goes, I probably top it up with 1L every 2.5k - 3k miles.  If I have a spirited drive or enjoy M6 Toll Road with enthusiasm then that window drops down to probably 1k miles.  That rarely happens though so generally it doesn't go above 3k RPM on normal commute.  Funny, my M5 consumes zero oil between services... I too hope it's not injectors and if it is fingers crossed its only 1, the one that is causing the misfire. Any idea of the cost for CVV? For the life of me I cannot locate the part number... 

 

Mr_530i - thanks for the tip, I'll give that a go and see how it feels! Can't do much till Friday though and fingers crossed it doesn't rain.  

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Oh, one more thing, well two.


On the CVV - is it integrated within the rocker cover? As I said, can't find it on any diagrams on realoem so found this:


N53 E90 330I UK spec does it have a CCV value or is it all in the cover, should i check the breather pipes first or replace cover? thanks

Followup from the Pelican Staff: it is integrated into the valve cover. - Nick at Pelican Part

 

For the injectors, any idea if I can test them by swapping and re-coding them to each cylinder? 

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I picked up 4 coil packs from ECP for 56 quid delivered (car had had 2 new from BMW already after 6 new injectors  - long story). Anyway the 4 new coil packs made a bigger difference to idle quality than the new injectors. I think stratified (idle) needs a strong spark to ignite and work properly as the mixture is so weak.

 

If yours hasn't had new coil packs I'd be giving that a go if you can get the same deal from ECP. Delphi ones too.. same as BMW. 

 

Or another injector test I've found is remove the plugs and see if any are wet with petrol. Needs standing over night. If they are wet in morning it's probably leaking.

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Got home tonight, warmed her up, removed oil cap - pretty much no resistance whatsoever. On a scale from 1 to10 - 1.  So whilst cvv is still possible it passed the initial test.

 

Anyway, ordered an injector from the dealer to have to hand tomorrow. I know they should be changed by banks at the least, but if the culprit is cylinder one that should make an immediate impact. 

 

Good advice on spark plugs.  I'll check for petrol deposits and also swap a coil from bank one with bank two before changing the injector.  Having heard of ECP (will check them out), but 56 quid for four coils is ridiculously cheap! That's 11.50 per coil? so worth getting that done regardless. 

 

Thanks for your support gents, much appreciated! 

 

As a separate topic fellow N53 owners, does your exhaust emit vapour? When cool/cold I guess all cars do but mine does it at all time. It's not gray or blue or thick white..but rather very thin, see through fumes. 

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My 57 E61 has been exhibiting similar symptoms as far as cold rough running goes, since I replaced the plugs a month or so back. With 151k miles on it, I'm not surprised it has a few niggles but a quick check on ECP puts a set of new coil packs at around 120 for the full set (obviously whatever discount they're running at the time will affect that).

Other than the normal exhaust vapours, I can't say my N53B30 emits anything more than I'd consider normal - which for a 151k miles engine ain't bad at all !

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ECP were running a 30% discount I think when I ordered mine

 

Exhaust vapour..  yes.. 43k miles uses no oil but I occasionally get a blue oil smoke very slight on start but I think it was over filled rather than say valve seals.  Otherwise it emits a lot of water vapour condensation which I think is normal. I think the very lean burn accounts for a lot of the n53 "personality" 

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Got it, seems normal then. Happy days! 

 

Just Googled ECP = eurocarparts! Yes, buy all service related bits there. A set of six Bosch coils is £128 with current 25% discount.  Still great!  Otherwise all other OEM parts I generally order from Germany - genuineautoparts.com. 

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2 hours ago, Ervin said:

Offer changed from 25% to 30% over night. Choice of Haas (£20 x 1) or Bosch coils (£28 x 1).. Ever heard of Haas? 

 

+1 on the smoke. Would be interested if Coil Pack sorts the problem. 

 

@HandyAndy_UK Did you torque your plugs when changing them? When I changed on my e46 performance seem slightly poor, I then re did them by torquing them to the correct specification and they were spot on. 

 

Edited by Mr_530i
Miss Read Ervin Reply Silly me

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1 hour ago, Mr_530i said:

 

+1 on the smoke. Would be interested if Coil Pack sorts the problem. 

 

@HandyAndy_UK Did you torque your plugs when changing them? When I changed on my e46 performance seem slightly poor, I then re did them by torquing them to the correct specification and they were spot on. 

 

Torque the plugs? No I didn't. I'll have to give that a check. Offhand do you know the setting for them?

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Depending on plugs 20-23nm I believe.

 

Torque specs are also generally listed on the box, I guess you would have binned that by now! 

 

Edited by Ervin
Addon

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Just had a hunt through the BMW tech manual

 

M12.... 23nm +-3

M14.... 30nm +-3

 

NGK ZKBR7A-HTU  is listed as 12mm thread but only takes 2 secs to remove the first and measure then torque the lot correctly.

Edited by HandyAndy_UK

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Got home, swapped plugs and coils around, started the car - DME yellow engine light came on.  Ran diagnostics, misfire stayed with cylinder 1.  To be fair, all coils looked a bit tired so whatever the fix is they are getting replaced along with spark plugs. 

 

Right, before changing the injector thought to should test INPA to see whether I will be able to code the new one. To my frustration and disappointment the system kept throwing this error as soon as I got to the SHIFT + F4 window :angry: so couldn't get the job done.  Tried other "tests", the error is the same for all but for some reason I could read all fault codes etc etc. Will contact the seller to see whether he can assist and soon.  Any ideas what this error relates to? 

DSC_0547.JPG

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Resolved software issues this morning. Replaced all spark plugs,  coils and injector for cylinder 1. Coded successfully. Significant improvement but not there yet. 

 

She didn't choke as much as before and whilst the roughness could still be felt I could describe it as 70% improvement. The idle fluctuated,  not as much but wasn't nice and even as it should be. 

 

I am not a pro but all sensors on live data stayed within the green parameters.  Any thoughts? 

DSC_0574.JPG

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