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7 Series - E65 / E66 (2002 - 2008)
Discussion of BMW's 4th generation E65/E66 7 Series flagship. The E65 generated much controversy, due to its radical styling and iDrive user difficulties. Nonetheless, the E65 broke records to become the best-selling 7-series iteration ever, especially after its 2005 facelift.

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  #1  
Old 05-06-2019, 09:54 AM
brian9979 brian9979 is offline
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Mein Auto: 2006 760i
2006 760 engine misfire.

I have a 2006 760 and Iíve replaced all the coils and spark plugs, but I am still having misfires, and itís running rough. Compression is good on all cylinders. Mechanic told me it was a bad engine. Any ideas?


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  #2  
Old 05-07-2019, 09:51 AM
OLM OLM is offline
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I also have a 2006 760, with the same issues. I've given up on going to any mechanic, even the dealer. They hit you with a high bill to learn off your car. BMW is worse, they bill you to learn off your car then forget as soon as it leaves. So the next guy also gets hit.

A 2007 x5 a friend owns was taken down the street to a local shop when it died on the highway. He was told just yesterday that he needed a new engine. I went with him to get the final cost and explanation only to notice that the shop didn't do any of the diagnostic work they claimed they had done. These guys are trying to get $6k for a new engine when the only thing wrong is a pulley and timing belt (which broke).

My 2006 750 went to a local shop for valve seals. He looked me dead in the eye and told me he has done this job before, no problem. Car was there for two months and ended up needing a new engine because he has never done that job before.

Ok, back on topic. My 2006 760 feels like its misfiring. On a cold start it seems ok most of the time with slight rev'ing. Once I drive for a while and slow down or come to a light it feels like it's misfiring on at least 2 cylinders. I've done the coils and plugs, no change. I don't get any codes, no engine lights. Engine rev's jump around, car feels like it wants to stall.

I have quite a few cars here (2x 745's, 760, F01 750 and a 323). On the 323, it was misfiring on 3 cylinders which turned out to be coils. I used the old coils from the 760 since they were not the issue and they worked just fine. But this 323 was doing the same thing, rev's jumping and wanting to stall. No codes, no engine light, runs fine until you stop. Turned out to be the vanos solenoids, the 323 has two of them. I didn't troubleshoot which was bad so I did them both and the car is flawless now.

I've narrowed this issue down to the vanos solenoids or the HPFP's. If the car injects fuel and doesn't spark you will get a code. If little or no fuel is injected, it will still be a misfire but it may not give a code (I've done fuel injection test on a 2004 745Li where cylinder 1 got no fuel and stumbled but tossed no code). I've not yet checked the HPFP line for leaking fuel as the sticky post here goes into detail on. I will on the next good day.

If you want to get into 7 series horror stories I should share just how bad a free 2003 745i can be .
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  #3  
Old 06-01-2019, 06:06 PM
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Mr_Burger Mr_Burger is offline
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Mein Auto: 2007 760Li
Most likely the Fuel Injection Control Module is faulting..
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  #4  
Old 06-10-2019, 04:01 PM
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Dalplex Dalplex is offline
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Mein Auto: O6 750Li
Mine only has #6 misfiring now and the roughness of it is over 4.
#8 and 9 has been fix by patching the grounding wire.
It is drivable with some shaking.

Not sure why it is hesitating while accelerating.
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06 750 Li, Clattering noise, suspect piston 2 hits head due to spun bearing.

03 760 Li,

Miss fire on #6
coolant leak from back plate.
Aux fan not work
Driver front vent is always hot
Acc only worked once
Oil reported low but not low on dip stick .
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  #5  
Old 06-19-2019, 12:03 PM
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csmeance csmeance is offline
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Mein Auto: 760Li
make sure you use new intake manifold gaskets any time you take off the manifold. 760 might have worn eccentric shafts or failing HPFP or could be lots of carbon buildup on valves. First check with smoke for intake leaks and then go onto the harder issues. Walnut shell blasting improved idle quite a bit on my 760.
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  #6  
Old 06-20-2019, 11:47 AM
brian9979 brian9979 is offline
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Mein Auto: 2006 760i
Turned out to be 2 bad injectors fixed those and issue is gone


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  #7  
Old 06-23-2019, 10:43 AM
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Dalplex Dalplex is offline
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Location: Canada
 
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Mein Auto: O6 750Li
My case on #6 is coil connector not set completely. Considered as very lucky after taking the manifold off 3 times.

Completely stable while idling and the roughness reduced to 2.

But code came back while accelerating.
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06 750 Li, Clattering noise, suspect piston 2 hits head due to spun bearing.

03 760 Li,

Miss fire on #6
coolant leak from back plate.
Aux fan not work
Driver front vent is always hot
Acc only worked once
Oil reported low but not low on dip stick .

Last edited by Dalplex; 06-23-2019 at 06:14 PM.
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  #8  
Old 06-29-2019, 01:25 AM
Mackman1157 Mackman1157 is offline
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Location: Springfield, MO
 
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Mein Auto: 04 760, 98 540, 02 M5
760 misfire

I have a 2004 760li and it has 160k miles and started having very rough idle so, I took it in to my Indy shop. I hooked it up to the scanner same as the dealer and read all the codes. It showed misfire on #7,9 cylinders so I replaced the plugs and used some fuel injector cleaner. I cleared all codes and drove it for several hours to get the injectors hopefully spaying correctly. Well... that didn't do the job so, I went and got some CRC Direct injection cleaner and did both banks. Several days later still has a rough idle so, again I cleared all codes and I had different cylinders misfiring this time. Cleared all codes and put in another bottle of injector cleaner with about 10 gallons of 91 with no ethanol. I then drove it pretty hard for an hour ( 0 to 140+) after that I drove in the city and the idle FINALLY went to normal and didn't have any codes. Tomorrow I'm going to KC and that will be a 3 hour drive to finish up the tank with the cleaner in it. One thing is what grade fuel do you use? When you get your 91 with NO ETHANOL and remember to use a gas station that people use the 91 because if the fuel sits in the tank in the ground I believe it maybe several weeks or a month stored it looses 1-2 octane points. Always use a high usage station. I've had over 30 different BMW's over past 25 years so, I've been playing with crazy issues like this 760 and learned from 2 MASTER BMW CERTIFIED GUYS with both having 30 plus years at the dealer then got smart and opened his own shop. I hope this helps.

Mack
417-209-9508 call if needed
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