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7 Series - E65 / E66 (2002 - 2008)
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Old 01-16-2015, 11:21 AM
Gogetter95 Gogetter95 is offline
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Location: St Paul
Join Date: Jan 2015
Posts: 1
Mein Auto: 760li
2006 760li running rough

Wondering if someone out there can steer me to get this car fixed. Purchased 2006 760 V12 a few months ago and looking at service history of months and months in/out of the two BMW shops here and no one seems to be able to fix for very long.

Replaced coils, plugs, knock sensors, cam sensors, etc over the past few months and still running rough. Now misfires on #5. Dealer says it's the injector and to be safe, all twelve injectors should be replaced. The HPFPs are leaking a bit but they say not enough to cause intermittent misfires here or there. Someone mentioned that the HPFPs shouldn't leak at all and if they do, you can get these erratic misfires all over the place.

Any suggestions??? Do I replace all 12 injectors? Or do I look more closely at the HPFPs??

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Old 01-16-2015, 02:11 PM
tim330i's Avatar
tim330i tim330i is offline
Location: Boston
Join Date: Dec 2001
Posts: 7,079
Mein Auto: Ti Silver 03 M3
Welcome to Bimmerfest! I've moved your thread to the 7 series forum, you will get more help in here. Get the diagnostic codes read at AutoZone or similar and we can go from there.

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Old 01-16-2015, 02:17 PM
rajdeep rajdeep is offline
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Location: NYC
Join Date: Mar 2013
Posts: 112
Mein Auto: 745LI
Did u get a chance to read this

05 745 LI
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Old 01-16-2015, 02:39 PM
Rick in Yuma's Avatar
Rick in Yuma Rick in Yuma is online now
bimmerfest Supporting Member
Location: Arizona
Join Date: Dec 2006
Posts: 248
Mein Auto: 05' 760li,94' H1,08'Smart
Yes the HPFP's can cause misfires. I'm doing the fix on mine now. Read the above listed link. You can skip to about page 15. Fuel in the wrong lines cause all kinds of problems. If they're leaking just a little bit that's a problem.and since no one has come up with the Bosch replacement parts. It's necessary to cut down a Magnafuel diaphragm. Or buy a couple of complete diesel pumps and remove the diaphragms from those. MWS Has used the diesel pump parts. All of that information is listed in the link Rajdeep sent you.
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