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-   -   p0304 on cold start up (http://www.m3forum.net/m3forum/showthread.php?t=600232)

roywat Wed, Jul-18-2018 08:19:18 PM

p0304 on cold start up
 
Hi I have a 1997 m3 upon cold start it runs smooth for about 10 sec then a slight misfire occurs if i raise the rpm for a few seconds its gone and wont come back till the next overnight soak once i got a code p0304 i replaced all the coils plugs and the number 4 fuel injector i have seen other posts about this but none that have posted the fix if anyone has any ideas i would be grateful Thanks also fuel trims look good engine runs strong its not compression unless its some strange intermittent problem

Pierre i am Wed, Jul-18-2018 09:10:26 PM

Re: p0304 on cold start up
 
Could be O2 sensors.

Has the car sat for a long time?

NolliM3 Thu, Jul-19-2018 01:44:17 AM

Re: p0304 on cold start up
 
You really need to use a BMW diagnostic such as INPA or DIS to be very clear what's happening.

roywat Thu, Jul-19-2018 03:27:08 PM

Re: p0304 on cold start up
 
yes car does sit seems strange for it to be o2 sensors with symptoms occurring in open loop on one cylinder

StealYourFace Sat, Jul-21-2018 12:23:45 PM

Re: p0304 on cold start up
 
Im not saying this is a fix, but I had a similar issue when cold as you describe, in cyl 5, then 4c that was resolved by a fresh set of coils.


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