N43 30C1 Error

epilamun · 10-20-2020, 09:48 AM

So for a couple of months I've had a number of issues, and I have had the following work done to the car:

Sump gasket
Oil filter housing gasket
Timing chain - was replaced with FAI kit
Spark plugs - these are Bosch, I've read that there could be issues associated with this due to the design of the plugs, should I change these?
Vanos solenoid exhaust
Thermostat - replaced about a week ago, only driven 30 mi since in short distances

About 14mi ago, 30C1 Engine Oil pressure control was spotted on Ista. I'm not exactly sure how long the journey was I just drove, definitely a similar distance to that.

I just added about 0.5L of 0w-30 oil to the engine before this journey, can this trigger a code? Also, although it was an aftermarket chain installed, I just doubt it can break up within 6000mi of being installed.

I also have had a light amount black smoke emanating from the left side of the engine, above the exhaust manifold after a small drive of 0.5mi just before I topped it up. I then took the car for a longer 13-14mi drive and now this has gone. Any specific reason that black smoke could have been there? I do have the occasional misfire at idle - the car shakes a little and I barely see a change in RPM - perhaps 50rpm at best. Also after this slightly longer journey the car had a very slight knocking noise at idle - I found this concerning.

If there's any more info you might need, give me a shout. I've tried old Google and can't really find much on this. Cheers

jwilalex · 10-20-2020, 11:22 AM

Correct plugs for N43 are NGK spark plug ZKBR7A-HTU. The Bosch ones you have fitted when compared to these are different length which guarantees misfires will be present.

As another member found when comparing in this thread

Andystobbs · 10-20-2020, 02:14 PM

Assuming your oil strainer isn't full of rubbish and your oil filter housing cap has fresh orings then your 3C01 will almost certainly be the oil pressure control valve. Replaced the oil pressure switch at the same time on the one I did, because it was so convenient while in that area. Never had 3c01 since.

epilamun · 10-20-2020, 06:26 PM

Do you know what would cause the dark coloured smoke? This was coming from the left side of the engine bay and not the exhaust. Exhaust produces a light mist basically at all times but never smells like oil

epilamun · 10-27-2020, 12:54 PM

I realised that the smoke is white, not black, so that clears up a lot of confusion. I finally replaced the spark plugs, took them out and saw oil on bank 4 (closest to windscreen). Guessing that the RCG is gone, though the mechanic I bought the car from replaced the gasket only 6k ago, perhaps he torqued it incorrectly or it needs new bolts?

W.r.t. the 30c1, can this be linked to the oil leak? Logic says not. Guess I might need to also change the hydraulic valve?

The spark plugs were also black - burnt over. Could this be due to:
- Incorrect length (bosch) causing poor firing
- VANOS issues (in the past)
or is this more sinister i.e. fuel injectors, HPFP or something along those lines? I still get excess white smoke/steam from the exhaust but it is not the head gasket.

Sal4.org · 08-14-2021, 03:47 PM

Quote:

Originally Posted by Andystobbs

Assuming your oil strainer isn't full of rubbish and your oil filter housing cap has fresh orings then your 3C01 will almost certainly be the oil pressure control valve. Replaced the oil pressure switch at the same time on the one I did, because it was so convenient while in that area. Never had 3c01 since.

Hi,

Whats wase your symptoms?

Andystobbs · 08-15-2021, 03:40 AM

Quote:

Originally Posted by Sal4.org

Hi,

Whats wase your symptoms?

Oil pressure warning, not every time, but always immediately after deceleration. Eg. After leaving the motorway the warning would come up.
The new valve cured it at the time, but that was 14 months ago. Its just started to reappear. I went to do an oil change and found fine metallic particles in the filter housing. I have now removed the engine and will be looking at the shells. Doesn't knock, so hopefully catch it early.

Andystobbs · 10-16-2021, 09:03 AM

Ended up getting the crank reground and new shells throughout on the engine.
Also stripped the oil pump and its absolutely knackered. Deep gouges worn in the casing between suction and delivery sides. No wonder the oil pressure has been iffy at idle.

Don't think the engine has ever been ran dry so the oil pump must just be worn out. This is at 167k miles.

10-20-2020, 09:48 AM	#1
epilamun New Member 1 Rep 16 Posts Drives: BMW e90 Join Date: Oct 2020 Location: UK iTrader: (0)	N43 30C1 Error So for a couple of months I've had a number of issues, and I have had the following work done to the car: Sump gasket Oil filter housing gasket Timing chain - was replaced with FAI kit Spark plugs - these are Bosch, I've read that there could be issues associated with this due to the design of the plugs, should I change these? Vanos solenoid exhaust Thermostat - replaced about a week ago, only driven 30 mi since in short distances About 14mi ago, 30C1 Engine Oil pressure control was spotted on Ista. I'm not exactly sure how long the journey was I just drove, definitely a similar distance to that. I just added about 0.5L of 0w-30 oil to the engine before this journey, can this trigger a code? Also, although it was an aftermarket chain installed, I just doubt it can break up within 6000mi of being installed. I also have had a light amount black smoke emanating from the left side of the engine, above the exhaust manifold after a small drive of 0.5mi just before I topped it up. I then took the car for a longer 13-14mi drive and now this has gone. Any specific reason that black smoke could have been there? I do have the occasional misfire at idle - the car shakes a little and I barely see a change in RPM - perhaps 50rpm at best. Also after this slightly longer journey the car had a very slight knocking noise at idle - I found this concerning. If there's any more info you might need, give me a shout. I've tried old Google and can't really find much on this. Cheers Last edited by epilamun; 10-20-2020 at 10:09 AM..
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10-20-2020, 11:22 AM	#2
jwilalex Private First Class 31 Rep 125 Posts Drives: E90 318i LCI SE Business Edn Join Date: Jan 2016 Location: Glasgow iTrader: (0)	Correct plugs for N43 are NGK spark plug ZKBR7A-HTU. The Bosch ones you have fitted when compared to these are different length which guarantees misfires will be present. As another member found when comparing in this thread
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10-20-2020, 02:14 PM	#3
Andystobbs Captain 191 Rep 720 Posts Drives: E91 Lci, Vectra B V6 Join Date: Sep 2019 Location: Chester, South Wirral iTrader: (0)	Assuming your oil strainer isn't full of rubbish and your oil filter housing cap has fresh orings then your 3C01 will almost certainly be the oil pressure control valve. Replaced the oil pressure switch at the same time on the one I did, because it was so convenient while in that area. Never had 3c01 since.
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10-20-2020, 06:26 PM	#4
epilamun New Member 1 Rep 16 Posts Drives: BMW e90 Join Date: Oct 2020 Location: UK iTrader: (0)	Do you know what would cause the dark coloured smoke? This was coming from the left side of the engine bay and not the exhaust. Exhaust produces a light mist basically at all times but never smells like oil
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10-27-2020, 12:54 PM	#5
epilamun New Member 1 Rep 16 Posts Drives: BMW e90 Join Date: Oct 2020 Location: UK iTrader: (0)	I realised that the smoke is white, not black, so that clears up a lot of confusion. I finally replaced the spark plugs, took them out and saw oil on bank 4 (closest to windscreen). Guessing that the RCG is gone, though the mechanic I bought the car from replaced the gasket only 6k ago, perhaps he torqued it incorrectly or it needs new bolts? W.r.t. the 30c1, can this be linked to the oil leak? Logic says not. Guess I might need to also change the hydraulic valve? The spark plugs were also black - burnt over. Could this be due to: - Incorrect length (bosch) causing poor firing - VANOS issues (in the past) or is this more sinister i.e. fuel injectors, HPFP or something along those lines? I still get excess white smoke/steam from the exhaust but it is not the head gasket. Last edited by epilamun; 10-27-2020 at 01:10 PM..
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10-16-2021, 09:03 AM	#8
Andystobbs Captain 191 Rep 720 Posts Drives: E91 Lci, Vectra B V6 Join Date: Sep 2019 Location: Chester, South Wirral iTrader: (0)	Ended up getting the crank reground and new shells throughout on the engine. Also stripped the oil pump and its absolutely knackered. Deep gouges worn in the casing between suction and delivery sides. No wonder the oil pressure has been iffy at idle. Don't think the engine has ever been ran dry so the oil pump must just be worn out. This is at 167k miles.
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