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Misfire when cold

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gttdigoof:

Drove my R for about 400 mls at the weekend with no problems at all but when I started  it next morning from cold it has developed a misfire.
The misfire seems to clear after a couple of minutes as the engine gets warm and it drives fine.
Some may have seen this on the R forum

I changed the plugs last night to see if that would help but this morning it was the same. (Fitted NGK PFR7S8EG gapped to 0.8mm)
 
I have scanned with VCDS and there are no codes present.
 
I did notice when changing the plugs that the coil packs are from 2009 so they will most likely be the next parts that I change and tonight I will fill it with shell vpower just in case the BP ultimate I put in on the motorway services was bad.
 
Are there any other suggestions of things to look for to cure the misfire ?

NikerGTI:
could be injectors mate, mine started misfiring after r-tech map, already had brand new iridium plugs the week prior.

 fitted r8 coil packs and all is fine.

gttdigoof:
Looks like it was fuel, filled with vpower last night and this morning it was back to normal

NikerGTI:
good stuff :happy2:

gttdigoof:
Well it came back.

Fitted some R8 coil packs but still no joy.

Using vcds I found it to be on cylinder 1.

Now looks like this



The injectors are here

http://mrinjectoruk.co.uk/Default.aspx

He is only down the road so took them this morning, he has some stories but also told me that on modern injectors that have a nylon gauze filter, running to much cleaners and detergents will kill the injector by melting the gauze which then goes further into the injector and causes problems.

For £26 each he is stripping, cleaning and servicing my injectors

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