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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 02-15-2014, 05:59 AM
mikejer mikejer is offline
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Location: stoke on trent
 
Join Date: Feb 2014
Posts: 2
Mein Auto: BMW 745i
random misfire

Hi I'm new to this and wanted to ask if anyone can help with a niggling problem. I've had my new to me 745i - 2002 50k miles converted to lpg and it seems to run fine most of the time. On a long trip to scotland this week after about 140 miles the engine started to misfire and the engine warning light came on. I switched off the light went off and then it recurred when I floored it to overtake. I took the car to bmw and they found and replace one faulty coil. On the trip back I just ocassionally get a "cough " but other than that it seems ok. I'm wondering whether to just change the rest of the coils. I'd appreciate any advice or comments
Cheers
Mike
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  #2  
Old 02-15-2014, 06:55 AM
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DMAX745i DMAX745i is offline
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Location: Mississauga Ontario Canada
 
Join Date: Feb 2014
Posts: 199
Mein Auto: 2013 750xi & 2002 745i
If u dont replace all the coils, u will continuously be having problems on and off. In my dads old Mercedes S500, he chose to go the cheaper route and inly replace the defective coil. That starter 2 years ago. Now he is up to 6 coils that he has replaced cause they keep goin 1 by 1. To save time replace all of them. They r electrical components which only have so much life.
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  #3  
Old 02-15-2014, 08:56 AM
irish745 irish745 is offline
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Location: ireland
 
Join Date: Sep 2012
Posts: 105
Mein Auto: e65 745i
Just gona say coil myself ,I had the very same prob on my last 745 its not actually a coil fault but with the ends of the coil packs the rubber that goes over the spark plug goes hard and brittle with the heat over time .I replaced 1 coil only to get the same fault on another ,my advice is replace them all now cause if they go to brittle like 1 of mine itl break off around the spark plug and its an absolute nightmare rocker cover off job .and ur temps will be running a bit higher now ur on lpg so do now and ul get a few years out of them

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  #4  
Old 02-15-2014, 09:54 AM
mikejer mikejer is offline
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Location: stoke on trent
 
Join Date: Feb 2014
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Mein Auto: BMW 745i
Thanks

Thanks for the advice guys, I've ordered some Bosch coils on tinternet and will try them next week, will update when I've seen how they perform
Cheers
Mike
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