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      07-13-2016, 04:00 AM   #1
Ryan135i
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N57 325d - Rough Idle on Startup - No Codes?

Morning all,

Just a quick one which is bothering me.

My N57 325d is a little lumpy on startup (from cold). This sometimes goes away with a little blip of the throttle and always once the engine has warmed up.

It's had a new preheating control unit (12218591724) and isn't throwing any codes.

I've read somewhere that it may be due to requiring a software update? How would I know if the car requires this?

Any other suggestions?

Cheers in advance.
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      07-13-2016, 06:27 AM   #2
dragerboy
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Think mine does a similar thing. Its not on first start up(from cold) but about 15 seconds later where the car shakes or judders. It goes within another 30 seconds or if I just drive off.

I have 2 glowplug codes but was told its not really an issue.
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      07-13-2016, 06:34 AM   #3
Sambuca1
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Had exactly the same symptoms with N57 330D at 80k miles....replaced EGR valve at a cost of 177 including labour, and this sorted the problem out straight away :-)
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      07-13-2016, 06:39 AM   #4
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Seen a few of these now again some with some without any fault codes fault codes sadly can give you a bum steer but look at the manifold carefully seen a few that are heavily carbon'd up and everyone who's reported rough running especially on tick over or from cold start when we have changed the manifold (we remove inspect first of course) have seen the issue magically disappear and to be fair its becoming something of a normality with these engines to look in this direction now sometime when its really bad we see a fault code re swirl flap plausibility some times we don't but when you are looking look also at the EGR bet that is coked up too.

But so far I can say I've got 6 6 cylinder manifolds from the N57 upstairs and 2 4 cylinder manifolds from the N47D2 all coked up all with rough running.
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      07-13-2016, 07:28 AM   #5
Ryan135i
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Quote:
Originally Posted by Sambuca1 View Post
Had exactly the same symptoms with N57 330D at 80k miles....replaced EGR valve at a cost of 177 including labour, and this sorted the problem out straight away :-)
I'll give this a go, thanks.

Will give it a good clean with carb cleaner and run it through my electrostatic cleaner to see if that fixes it.

Failing that, will order a new valve and fit it myself.
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      07-13-2016, 07:30 AM   #6
Ryan135i
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Quote:
Originally Posted by old grey steve View Post
Seen a few of these now again some with some without any fault codes fault codes sadly can give you a bum steer but look at the manifold carefully seen a few that are heavily carbon'd up and everyone who's reported rough running especially on tick over or from cold start when we have changed the manifold (we remove inspect first of course) have seen the issue magically disappear and to be fair its becoming something of a normality with these engines to look in this direction now sometime when its really bad we see a fault code re swirl flap plausibility some times we don't but when you are looking look also at the EGR bet that is coked up too.

But so far I can say I've got 6 6 cylinder manifolds from the N57 upstairs and 2 4 cylinder manifolds from the N47D2 all coked up all with rough running.

Car has only done 66k so hoping it's not coked up too bad.

Will report back once the EGR has been cleaned up.

Anything else to check while I'm under the bonnet?
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      07-13-2016, 07:32 AM   #7
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Quote:
Originally Posted by Ryan135i View Post
Car has only done 66k so hoping it's not coked up too bad.

Will report back once the EGR has been cleaned up.

Anything else to check while I'm under the bonnet?
Seen a 330d with 41347 miles and a 325d with 45621 miles trust me mileage doesn't mean a thing
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      07-13-2016, 07:41 AM   #8
Ryan135i
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I know driving style has a big effect on how coked up the engines get, but this has never been a town car, so fingers crossed.

As for EGR valves, which is the better option out of Wahler, Vemo or ERA?
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      07-13-2016, 07:44 AM   #9
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Quote:
Originally Posted by Ryan135i View Post
I know driving style has a big effect on how coked up the engines get, but this has never been a town car, so fingers crossed.

As for EGR valves, which is the better option out of Wahler, Vemo or ERA?
No idea re brands you've suggested but I always opt at all times going genuine which is around 142+VAT from memory
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      07-13-2016, 08:01 AM   #10
Ryan135i
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Doing some research, apparently "Wahler is an OEM supplier to European car manufacturers".
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      07-13-2016, 08:03 AM   #11
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Quote:
Originally Posted by Ryan135i View Post
I'll give this a go, thanks.

Will give it a good clean with carb cleaner and run it through my electrostatic cleaner to see if that fixes it.

Failing that, will order a new valve and fit it myself.
When I saw the old EGR valve pulled from the car, it didnt appear to be overly caked in carbon to be perfectly honest, made me wonder if there was a problem with the actuator opening and closing the valve. I have no idea, the car was under wartanty so had the whole unit replaced....no problems afterwards.

Cleaning would definitely be a logical first step, but if the problem still persists, I would say it does not completely rule out a malfunction of the unit itself. Good luck and keep us posted on developments.
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      07-13-2016, 08:09 AM   #12
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I have an EGR delete pipe which when installed I'm pretty sure it didn't do it. Currently running with standard EGR system due to needing it mapped out.

Last edited by dragerboy; 07-13-2016 at 08:14 AM.
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      07-13-2016, 01:27 PM   #13
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I have a 330d LCI on 72k and having cleaned the MAP sensor recently; the inlet is definitely coked and I'm getting the Swirl flap plausibility error.

The coking isn't oily like on the M57; it's more a dry powder but I can see it making a mess with a little moisture.

Steve; how hard is removing the inlet to clean it?
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      07-13-2016, 05:16 PM   #14
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As Steve said, manifold related. Swirl flap plausability code with mine. After stripping and cleaning manifold years ago until spotless it's the cr@ppy little white plastic cam that attaches the swirl flap motor to the flaps that's worn.
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      07-13-2016, 05:38 PM   #15
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Quote:
Originally Posted by elbutio
As Steve said, manifold related. Swirl flap plausability code with mine. After stripping and cleaning manifold years ago until spotless it's the cr@ppy little white plastic cam that attaches the swirl flap motor to the flaps that's worn.
Good info.

How big a job is stripping the manifold?

I wonder if the N47 swirl flap Bing can be used if the swirl flaps are rod are removed. But would that throw errors again.
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      07-14-2016, 05:12 AM   #16
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Quote:
Originally Posted by Len_Beach View Post
Good info.

How big a job is stripping the manifold?

I wonder if the N47 swirl flap Bing can be used if the swirl flaps are rod are removed. But would that throw errors again.
The N57 like the N47 uses a rod to hold the swirl flaps so you could use a bung to block the hole. I do not know if the N47 bung would fit the N57 engine though. If it didn't you would still leave the existing part in place but obviously with the rod and flaps removed.

It won't raise any codes because you aren't actually disconnecting the electric actuator, it will still function but it won't actually be doing anything useful.
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