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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 09-11-2012, 07:23 PM
SuitedKings SuitedKings is offline
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Location: Worcester
 
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Mein Auto: 2004 BMW 745Li
MISFIRE On ALL 8 CYLINDERS HELP

BMW is trying to charge me $7000 to fix my 2004 BMW 745Li because it is "Misfiring" through all 8 cylinders. They're also stating that my secondary air system has a fault. My car has 69K miles on it and I've had the coils and spark plugs checked already. Please help!!!!!!!!!!!!
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  #2  
Old 09-12-2012, 12:05 AM
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sirstopher sirstopher is offline
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Mein Auto: POS Honda
Post this in the e65 section
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  #3  
Old 09-12-2012, 08:56 AM
SFbay SFbay is offline
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Location: SF
 
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Mein Auto: BMW 745i
Quote:
Originally Posted by SuitedKings View Post
BMW is trying to charge me $7000 to fix my 2004 BMW 745Li because it is "Misfiring" through all 8 cylinders. They're also stating that my secondary air system has a fault. My car has 69K miles on it and I've had the coils and spark plugs checked already. Please help!!!!!!!!!!!!
Interesting
So how did it happen??? Just out of nowhere???
I guess valve cover gaskets are leaking causing misfires bc coils are flooded with oil. What does the dealer say??
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  #4  
Old 09-12-2012, 09:25 AM
chrisrees chrisrees is offline
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Location: Colorado
 
Join Date: May 2012
Posts: 99
Mein Auto: 02 745li
Won't drive if it needs all 8
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Repairs 2012
wishbone & steering rack
Rfmd hydro steering gea
combination nu
Ball Joint
Tension strut with hydr
Switch unit steering column
Coils 5&7 and new spark plugs
Faulty DSC Control Module
Fuel Gauge
Leaking Crank Case Vent Valves
Power Steering pump, washer pump and grommont,
Crank Shaft position sensor
Total $13,481.37 in one year my mechanic swears all these parts are re engineered to work better than the originals lol
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  #5  
Old 09-14-2012, 10:59 AM
coole65i coole65i is online now
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Location: Southern California
 
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Posts: 151
Mein Auto: 2009 F01 SPORT
Quote:
Originally Posted by SuitedKings View Post
BMW is trying to charge me $7000 to fix my 2004 BMW 745Li because it is "Misfiring" through all 8 cylinders. They're also stating that my secondary air system has a fault. My car has 69K miles on it and I've had the coils and spark plugs checked already. Please help!!!!!!!!!!!!
What are the symptoms? Is it idling rough? How do you know that all 8 cyl. are misfiring? Did the stealer show you the actual codes your car is throwing? A $40 code reader can tell you which cylinders are misfiring. Even if you had to redo all valve cover gaskets, coil tubes, coils and plugs, it's NOT going to cost $7k. They are all DIY items. If you are not a DIY'er, you can find an indy BMW mechanic for a lot less. I did this job myself for my 545i which has the same engine as your 7 and recently changed the plugs on my LCI 7 as well.
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Old 09-14-2012, 08:56 PM
southfla305boy southfla305boy is offline
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Location: Miami, FL
 
Join Date: May 2012
Posts: 7
Mein Auto: '03 BMW 745LI
*****************CHECK YOUR PCV VALVE...ITS ON THE TOP OF THE VALVE COVER..SHOULD BE 2 (one on each)......try this: Idle the car, open oil filler cap, there should be A LIL bit of vaccum/suction.. if it stalls out, then they are bad...$70 for both at the dealer..


Im a Mechanic and tried new coils, plugs, compression check and ALMOST changed the computer ($900)...03 745Li misfire cylinder 2 with fuel cut-off

now she idles CRAZY SMOOTH......any questions let me know Good Luck
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  #7  
Old 09-14-2012, 09:00 PM
southfla305boy southfla305boy is offline
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Location: Miami, FL
 
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Mein Auto: '03 BMW 745LI
*******************CONTINUED********************

forgot to explain what was happening.. when they go bad, there is EXCESS pressure in the crankcase which was throwing off the crank sensor, therefore sending the wrong signal...as SOON as i replaced them, it started up like nothing happened...She used to stumble at idle and worse when in gear at a stop light. But u WOULD NOT feel it as u drove or even put your foot down...just at idle
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