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BMW 740i Miss Fire Help

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BMW 740i Miss Fire Help

Postby *Adz* » Tue, 06 Nov 2012 15:54:18 UTC

I parked up about 4 days ago, all fine, started today... and i have a miss fire... and a smelly egg smell lol. Any idea what this could be, also wheres the best place to get a coil from?

Thanks
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Re: BMW 740i Miss Fire Help

Postby mega-e39-fan » Tue, 06 Nov 2012 16:20:30 UTC

Misfire could be anything from a coil pack to a faulty sensor - best to get the codes read for a proper diagnosis. For a coil pack try Euro car parts (there are codes for 25% off available online) or alternaively BMW Costwold the trade sponsor who can do a good discount for members.
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Re: BMW 740i Miss Fire Help

Postby *Adz* » Tue, 06 Nov 2012 16:31:48 UTC

Well when unplugging the coils, it dont really make much different, i dont really know anyone with a diag machine that will fit? Took one plug out, it had a lil oil on it, but when you take plug cover off on the and theres a noise there like slight knocking/arcing noise, but once that plastic bits on you cant hear it....

arrhhh what to do! I dont want to end up breaking it!
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Re: BMW 740i Miss Fire Help

Postby slim_boy_fat » Tue, 06 Nov 2012 16:54:12 UTC

Might be a blocked catalytic convertor :cry: but as above, fault codes are your friends.
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Re: BMW 740i Miss Fire Help

Postby *Adz* » Tue, 06 Nov 2012 17:23:15 UTC

Fault codes are my friends, but firstly need to find someone or somewere with a fault code reader lol.

And would a blocked cat make it missfire?
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Re: BMW 740i Miss Fire Help

Postby slim_boy_fat » Tue, 06 Nov 2012 20:09:55 UTC

Could account for the rough running, and the smell.
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Re: BMW 740i Miss Fire Help

Postby *Adz* » Tue, 06 Nov 2012 20:30:42 UTC

Hmmmm.... This is where i should of stayed with Vauxhall lol... I know plenty of people and i know more about the cars myself lol. I look at this BMW and im lost lol.
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Re: BMW 740i Miss Fire Help

Postby *Adz* » Thu, 08 Nov 2012 09:57:10 UTC

Well we've put a computer on it, and the fault codes are 77 13 23 25 50..... ???? now im still lost lol
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Re: BMW 740i Miss Fire Help

Postby Ingussc » Thu, 08 Nov 2012 13:49:19 UTC

http://www.endtuning.com/bmwcodes.html
The best way to read your faults and errors is your local BMW DEALER, they won't charge more than 50 pounds, but will give you a full description and meaning of these faults. Sometimes you have faults about coils and lambda sensors because of vacuum leak in inlet etc...
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Re: BMW 740i Miss Fire Help

Postby *Adz* » Thu, 08 Nov 2012 14:03:22 UTC

Hi, thanks for your help, what list do i look at there? As there are a few there.
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Re: BMW 740i Miss Fire Help

Postby slim_boy_fat » Thu, 08 Nov 2012 15:29:06 UTC

Have a look at this thread on bimmerforums CLICK HERE - lists the codes with their meanings. :D
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Re: BMW 740i Miss Fire Help

Postby *Adz* » Thu, 08 Nov 2012 16:46:51 UTC

I think i cured it, plugs were capped in oil, cleaned up and put in.. happy days now, new rocker covers and plugs tomorrow :)
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Re: BMW 740i Miss Fire Help

Postby Ingussc » Thu, 08 Nov 2012 16:47:10 UTC

slim_boy_fat wrote:Have a look at this thread on bimmerforums CLICK HERE - lists the codes with their meanings. :D

Different Engine Controls has a different code meaning: SEE HERE !!!
"P" codes not always are appropriate to real BMW meaning.
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Re: BMW 740i Miss Fire Help

Postby takemetothepub » Thu, 08 Nov 2012 17:28:23 UTC

*Adz* wrote:I think i cured it, plugs were capped in oil, cleaned up and put in.. happy days now, new rocker covers and plugs tomorrow :)


um, I'd be finding out why they are covered in oil!!!!

Not a good sign to say the least.......
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Re: BMW 740i Miss Fire Help

Postby *Adz* » Thu, 08 Nov 2012 17:34:24 UTC

They are covered in oil as the rocker cover gaskets in the middle is leaking... hence ive ordered new one :)
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