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Rough idle, misfire, wants to die
Posted: Wed May 21, 2014 2:36 am
by Sach_UK
Hi i have a g 1989 325i cabby preface which was running fine for a while after a small service, new maf, new idle control valve, new intake boots which then finally brought the idle down correctly. Yesterday i thought i had perfected the engine side of things, fired her up today and she started to rough idle, misfire and shook the whole cabin quite roughly. it spluttered between 100-800 rpm. Any ideas what to look at first? thanks
Re: Rough idle, misfire, wants to die
Posted: Wed May 21, 2014 6:21 am
by JF008
Did you use a BMW maf or a generic one? Had that problem with the cheap stuff... and vacuum leaks.
Re: Rough idle, misfire, wants to die
Posted: Wed May 21, 2014 2:42 pm
by Sach_UK
BMW maf mate
Re: Rough idle, misfire, wants to die
Posted: Sat May 24, 2014 1:19 pm
by Manni198
i know this dumb but have u got petrol in it
Re: Rough idle, misfire, wants to die
Posted: Sun May 25, 2014 2:20 am
by JF008
Have you solved your issue? you can try disconnecting the MAF to see if its the cause of the problem..
Re: Rough idle, misfire, wants to die
Posted: Sun May 25, 2014 11:13 pm
by oomz1975
Check all hoses are still fitted on tightly, no air leaks etc.
Re: Rough idle, misfire, wants to die
Posted: Sun May 25, 2014 11:17 pm
by Speedtouch
Try disconnecting the ECU or battery and leaving it for an hour or so to reset the ECU. Then let it idle for at least 10 minutes, switch off, then go for a drive throughout the rev range.
This ensures base idle settings are learnt and full data transfer from the EPROM chip.