35is Cold Start Rough?

[Z4M-2006]

I would be putting injectors 1-3 in as well as a cam cover gasket set.

Probably a set of ;lugs too depending on how long they have been in.

[john-e89]

Hey guys,

When starting my car, the idle feels a little rough. It almost feels like I can feel it misfiring. This only occurs on cold starts, warm starts etc are fine.

Apart from the rough cold start, the car runs perfectly fine at WOT. The car starts and cranks fine as well. There is no check engine light, or any other light showing on the dash, and there are no codes showing via code reader either.

Now I have googled this and seen people with similar issues on the N54. I have seen a suggestion that it could be an injector leaking, causing built up fuel in to the cylinder to combust on cold start. How ever I can also see people suggesting walnut blasts, coils, sparks, HPFP etc...

Any one had anything similar?

Sorry you’re having this Sunny, I’m surprised it’s started as it was fine with me but I guess there’s got to be a start point sometime....

[sunnydays]

I would be putting injectors 1-3 in as well as a cam cover gasket set.

Probably a set of ;lugs too depending on how long they have been in.

Hi mate, thanks for the response

I have ordered 3 new Index 12 injectors, as well as 6 new spark plugs.
I am thinking of proceeding in the following order:

Clean spark plug wells
Replace spark plugs
Install new injectors
Run the car for a week or so, after which I will inspect the spark plugs again. I will do the valve cover sometime shortly in the future

Sound sensible?

[sunnydays]

Sorry you’re having this Sunny, I’m surprised it’s started as it was fine with me but I guess there’s got to be a start point sometime....

Hi John, hope you are well
Don't worry about it, these things happen. The car is almost 10 years old, and it is a N54 after all

[Z4M-2006]

I would be putting injectors 1-3 in as well as a cam cover gasket set.

Probably a set of ;lugs too depending on how long they have been in.

Hi mate, thanks for the response

I have ordered 3 new Index 12 injectors, as well as 6 new spark plugs.
I am thinking of proceeding in the following order:

Clean spark plug wells
Replace spark plugs
Install new injectors
Run the car for a week or so, after which I will inspect the spark plugs again. I will do the valve cover sometime shortly in the future

Sound sensible?

Yea,

Im sure thats the only way that oil can get into the plug holes though,so im thinking your delaying the inevitable.There about £65 for a gasket set.

[sunnydays]

I would be putting injectors 1-3 in as well as a cam cover gasket set.

Probably a set of ;lugs too depending on how long they have been in.

Hi mate, thanks for the response

I have ordered 3 new Index 12 injectors, as well as 6 new spark plugs.
I am thinking of proceeding in the following order:

Clean spark plug wells
Replace spark plugs
Install new injectors
Run the car for a week or so, after which I will inspect the spark plugs again. I will do the valve cover sometime shortly in the future

Sound sensible?

Yea,

Im sure thats the only way that oil can get into the plug holes though,so im thinking your delaying the inevitable.There about £65 for a gasket set.

Yeah you are right, I will do the injectors first. Then do the valve gasket a week later. I will update this thread as I go along

[sunnydays]

Update:

So this morning I inspected the valve cover / gasket, particularly around cylinder 3 as that had the most oil leakage. Some one tell me this is not a crack and I am seeing things lol



Edit: Best price I have had for a new valve cover so far is £360, anyone aware of any cheaper sources?

[Z4M-2006]

Oh Jesus

What’s gone on there!!

That’s definitely looks like a crack to me,

Funnily enough I have seen an issue very similar to that on a 335i I used to look after a couple of years ago

Someone had cracked the cam cover trying to prize off the upper engine cover bizarrely.

I replaced the cam cover and all good, but like you say it was around £500 all in at the time

[Z4M-2006]

Has that been broken by something internally hitting it ?

The more I look at the pic the more it seems that the damage has come from the inside ?

[enzed4]

Update:

So this morning I inspected the valve cover / gasket, particularly around cylinder 3 as that had the most oil leakage. Some one tell me this is not a crack and I am seeing things lol



Edit: Best price I have had for a new valve cover so far is £360, anyone aware of any cheaper sources?

Yep, that's a crack unfortunately. Gotta love plastic covers...
Cracked rocker cover on N54 is very common (apparently). Here's mine from a couple of months ago

[Cees Klumper]

I was wondering why there were aftermarket covers being offered, now I know why. You can get them for around $110, new gasket included. No idea about the quality but it sure is cheaper than original BMW:

https://www.amazon.com/JDMSPEED-Engine- ... B0797QL15W

[sunnydays]

Has that been broken by something internally hitting it ?

The more I look at the pic the more it seems that the damage has come from the inside ?

Oops missed this. It seems to be common on the N54, the valve cover cracking / the gasket leaking. Seems to be very brittle. I have removed the valve cover, and the internals seem fine, just the cover was cracked somehow.

Yep, that's a crack unfortunately. Gotta love plastic covers...
Cracked rocker cover on N54 is very common (apparently). Here's mine from a couple of months ago

Seems to be all too common, almost £400 for a plastic cover is a bit of a joke really too.
Interesting that yours seems to be cracked in the exact same space?

I was wondering why there were aftermarket covers being offered, now I know why. You can get them for around $110, new gasket included. No idea about the quality but it sure is cheaper than original BMW:

https://www.amazon.com/JDMSPEED-Engine- ... B0797QL15W

The aftermarket ones have terrible reviews mostly, this is not a job you want to do twice, thus I have ordered the BMW Genuine part.

[Z4M-2006]

Ah well.

Will keep you busy,you like messing about..

[DPG]

No more racing Z4M is those E89’s made from biscuits.

[sunnydays]

Ah well.

Will keep you busy,you like messing about..

I don't follow lol

No more racing Z4M is those E89’s made from biscuits.