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7 Series - E65 / E66 (2002 - 2008)
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  #51  
Old 08-27-2012, 02:34 PM
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Gadget760Li Gadget760Li is offline
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It was Skuzlm3 which gave me that advice.

I have copied my dealers receipts and pasted them below you can maybe go to your dealer with with some first hand info and see what he says
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  #52  
Old 08-27-2012, 02:42 PM
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Gadget760Li Gadget760Li is offline
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Wow new BMW 760Li owner

I do agree with I will be getting my car checked regular by BMW or any qualified mechanic (if anyone knows one in East Sussex please let me know)
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  #53  
Old 08-28-2012, 06:28 AM
N900WM N900WM is offline
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These engine must run a tremendous amount of overlap to allow this type of buildup.

Quote:
Originally Posted by new760Liowner View Post
A 2003 760Li. Read some horror stories about carbon buildup and decided to check the
condition of the intake valves. No idle issues but a slight hesitation on setting off from 1st
gear in comparison to my E38 750.

The carboned up pic is from one of the four cylinders closest to the firewall whereas the dryer-looking grey filmed intake valve are representative of the front cylinders closest to the
PCV/pressure valve.

I am picking up some walnut shells and a media blaster later today and hope to begin blasting later this week.

Attachment 339259

Attachment 339260
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  #54  
Old 08-28-2012, 07:27 AM
new760Liowner new760Liowner is offline
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PCV line

I did notice that there was a small puddle of oil inside the intake manifold, near the firewall, which probably explains why the rear cylinders were more gunked up compared to the front cylinders. When I removed the PCV/pressure valve, there was a small smear of oil on the sealing surface, as if significant amounts of oil were making there way into the intake manifold from the PCV system.

There may be an exhaust-intake overlap contribution, but I think the main problem, based on what I found, is that oil is not being separated effectively in the PCV stream.

I did pickup the walnut shells and blaster yesterday and adapted the wet/dry vacuum to an old E38 coolant hose which stuffs into the intake runners if you cut a triangle out of the hose (will be posting pics later in the week).
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  #55  
Old 08-28-2012, 03:10 PM
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Gadget760Li Gadget760Li is offline
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Look forward to see the pics
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  #56  
Old 08-28-2012, 03:54 PM
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Gadget760Li Gadget760Li is offline
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You guys sounds like proper mechanics unfortunately I have to take my car to BMW to get maintained but do pick up lots of tips from you guys.
Just a simple Systems Engineer can build any type of network VLAN, WAN, LAN, CISCO and also does programming Java, C# and C++ BUT
I can't even pull my engine apart unless it was a Transformer . I take my car to BMW for everything even the dreaded battery change. Is it true BMW have to program the battery to the car for the 760?
I will tackle electronics on the car comfortable with that had a go and rewired a whole early shape before the E38 shape 7 series before perfect brought it for 400 sold it when I finished for 1200.
But you'll open these up post pics comment like its a walk in the park serious my hat is off to you all RESPECT and blessings to the 7 family

Last edited by Gadget760Li; 08-28-2012 at 03:56 PM.
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  #57  
Old 08-28-2012, 05:26 PM
new760Liowner new760Liowner is offline
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Battery registration

Funny you mention the battery. Bought the car just a month ago and noticed the battery
charging light came on and the interior blower fan wouldn't adjust fan speed. Ended up
looking in the trunk and discovered the original July 2005 battery (car wasn't sold until 2005..at $120k I'm not surprised).

Replaced the battery with the same AGM type and used
an INPA-compatible cable I got off Ebay to register the battery using INPA on a laptop.

The new battery fixed the fan speed issue (apparently only one fan speed is available on a low battery).

Installation on a laptop wasn't that bad as the cable I bought off Ebay came with the INPA installation and instructions...took about an hour or so.

Just do a little research and it pays off in spades.

Last edited by new760Liowner; 08-28-2012 at 05:28 PM.
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  #58  
Old 08-28-2012, 05:36 PM
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Well BMW wanted to charge me 320 that was including a new battery but I'd brought a Bosch one already heard they were really good so I only ended up paying 60 and got a free wash (that's the car )
I'll research how to do it with the laptop and get the lead from eBay which I'm on now THANKS
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  #59  
Old 08-29-2012, 04:48 PM
lawandorder39 lawandorder39 is offline
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Rough idle

Well the rough idle continues only when I have the ac on. Also when I reach speed of 60. No warning lights at all. At this point I don't no why I still get the rough idle during air conditioning operation and when I reach a speed of 60,

Quote:
Originally Posted by heavenlyride View Post
I have a 2004 760LI. I saw your post recently on the misfire codes. I like you took off the intake and replaced the coils and the plugs. I put everything back together and it was the same codes showing up.

I am hoping that we can collaborate as we discover what the root cause is for both of us.

The torque value for the intake is 15nm and the sequence the indie tole me to use was, snug center out before torquing. Then alternate side to side from center to outer bolts until at right torque.

Elliott.
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  #60  
Old 08-29-2012, 05:10 PM
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Gadget760Li Gadget760Li is offline
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I'm a bit of a novice here but if its happening when the climate control is on wouldn't that point towards the fuel system somewhere or air leaks?

Is your car drinking more fuel than usual?
Does it nearly cut out then rev high before it settles back down?
Would it cut out at a low speed?
Does it react to super unleaded worse than regular?

Just a few questions from a novice point of view
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  #61  
Old 08-29-2012, 06:47 PM
new760Liowner new760Liowner is offline
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60mph stumbling and idle stumbling

My guess on the 60mph stumbling is you are probably in 6th gear and the low RPM is similar to the idle speed RPM. See if the stumbling persists if you switch to manual mode on the steering wheel and drop a few gears but maintain 60mph (i.e. your speed is constant but your RPMs go up due to the lower gear).
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  #62  
Old 08-30-2012, 05:37 AM
N900WM N900WM is offline
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Update from my dealer yesterday. They told me that aside from the intake valve cleaning, they were also replacing some water separator system? He said this was a known problem with these cars. I'll know more when I get the final tally. So far it's taken them 4 days longer than they expected.
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  #63  
Old 08-30-2012, 07:29 AM
new760Liowner new760Liowner is offline
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Water Separator?

Do you mean the fuel filter or maybe the labyrinth oil separator? Trying to figure out where a water separator would be located. Let us know more details..maybe a part number?
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  #64  
Old 08-30-2012, 10:32 PM
lawandorder39 lawandorder39 is offline
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Hello

All I can reply with is, be careful when you deal with the dealer. Unless you have deep pockets full of money to throw away to the dealer. The BMW dealer took me for $2000 and my 760 is still running rough. When I turn my ac on and when I reach a speed of 60 it runs rough.The steilership BMW dealer say its one thing and supposedly repair it, then when the problem persist they say its something else.
The weird thing is they will break the engine down to find out what they thought was wrong then try to charge you $900 to put it back together.
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  #65  
Old 08-31-2012, 04:28 PM
new760Liowner new760Liowner is offline
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Initial Carbon Cleaning Experience

I ended up using the Harbor Freight Portable Media Blaster, mainly for the siphon gun, and adapted the gun to a similar setup that n54tech used. Since I didn't want to wait for a BMW blasting wand, I used the brass barb to 1/2" FIP fitting to replace the white ceramic nozzle and then reduced the 1/2" FIP to 1/4" FIP and then a 9" MIP nipple. I tried reducing the 1/4" down to 1/8" but the backpressure interfered with the siphon.

Instead of the E38 coolant pipe vacuum adapter that BMW recommends, I used some aquarium sump foam to mold to the intake runners with the 1/4" pipe through the middle and a similar 1/4" vacuum pvc tubing. Once everything is setup, the blasting is fairly quick. After each cylinder I used a smaller diameter vacuum adapter to remove the walnut shells on the valve surface.

On some of the valves, some baked on carbon remains so I'm off to Walmart to get a gun cleaning kit and some carb cleaner to soak.

Total cost for what I did was:

$28 portable media blaster
$22 25 pounds of walnut shells (way more than enough, even for the V12)
$15 brass fittings to adapt the siphon gun

Necessary Items:

Wet/Dry Vacuum (if you don't have one)
Air Compressor (I used a 1.6hp Porter Cable 4.5 Gallon, 6cfm @ 90psi)
Duct Tape
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  #66  
Old 09-01-2012, 08:16 PM
lawandorder39 lawandorder39 is offline
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Rough idle

Yes it is using more gas but it never cuts off.

Quote:
Originally Posted by Gadget760Li View Post
I'm a bit of a novice here but if its happening when the climate control is on wouldn't that point towards the fuel system somewhere or air leaks?

Is your car drinking more fuel than usual?
Does it nearly cut out then rev high before it settles back down?
Would it cut out at a low speed?
Does it react to super unleaded worse than regular?

Just a few questions from a novice point of view
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  #67  
Old 09-04-2012, 08:44 AM
N900WM N900WM is offline
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Picked up my car from the dealer this weekend and it's still running rough. In fact, it's worse than ever. My car is still under warranty through October so it's no charge.
They are coming to pick the car up tomorrow and try again.
I asked them if I could extend the warranty and they said I could extent it another 36K miles for $5175.

As I antisipated, the intake valve cleaning did nothing. They said they found serious build up on the rear four cylinder intake valves. A broken wire on one accentric shaft position sensor and excessive oil in the intake system and replaced both cyclone/oil seperators.

They also replaced the hood cables and opening lever because they said it was faulty...The handle fell off on my feet on the way home.
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  #68  
Old 09-04-2012, 09:05 AM
new760Liowner new760Liowner is offline
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My weekend with Walnut Shell blasting on the N73

Same thing with my intake valves. The rear four, mainly the two closest to the firewall, had a fair amount of wet-looking gooey deposit but the front eight only had a light grey thin coating. I also found an oil puddle inside each bank of the intake manifold at the end closest to the firewall which is, coincidentally, furthest away from the PCV pressure valves at the front of the engine. Maybe the oil-laden PCV blowby has more time to condense since it travels further to the back two cylinders?

At any rate, I also discovered this weekend that a few of the valve stem seals are leaking (probably magnified when I applied a vacuum to remove the walnut shells).

Looking hindsight, since I didn't remove the intermediate intake runners and fuel rails, I will use some Chemtool B-12 and a brass drill attachment to clean the valves in the future. The walnut shell blasting works but I find that until BMW develops a vacuum adapter specific to the N73, the limited range of movement using a coolant hose or, in my case, some foam, is a bit of a pain versus a ~12" drill extension with a brass brush.

Also, for those that attempt this, make sure you have INPA available. I tried to restart the motor and was greeted with an Engine Failsafe. Turns out the DK throttle motors weren't happy and I needed to clear the errors and reset adaptation using the dash method (ignition on, throttle hold for 25 seconds, ignition off, start car) to get things going again.

My idle wasn't that bad before so I was mainly interested in the condition of the intake valves when I started the project. As for the hesitation on setting off, I will look into the Guibo joint, then maybe a transmission fluid change in a couple months.
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  #69  
Old 09-07-2012, 05:42 PM
N900WM N900WM is offline
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So the dealer called today to tell they could not find anything wrong with the car. Said it ran fine and only had one trouble code.
Just before they picked it up the other day the car was stumbling and popping out the exhaust. Now they say it's ok.
I asked the service writer, whom I know pretty well, to drive it for the weekend. He said he would.

BTW, they offered to extend the warranty for $5000++
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  #70  
Old 09-07-2012, 05:56 PM
new760Liowner new760Liowner is offline
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What was the trouble code they found? When I reset the adaptations right after reassembling everything after the intake cleaning, the car ran like crap and the engine stumbled awhile before clearing up. Hopefully they find out what's wrong.
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  #71  
Old 09-10-2012, 02:20 PM
N900WM N900WM is offline
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It was for differential pressure again. They told me the computer needed time to reconfigure.
They drove it all weekend and found no issues. I picked it up today and it runs very well. There was one time it ran a little rough when the A/C kicked on but it straightend itself out and did not act up again.
Maybe it was the valves. It runs now.
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  #72  
Old 09-10-2012, 06:47 PM
new760Liowner new760Liowner is offline
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Glad it worked out. Makes me want to keep a couple of those sensors around..just in case.
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  #73  
Old 09-10-2012, 09:23 PM
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sirstopher sirstopher is offline
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I read this at lunch today, I am sure at some point I too will have to go down this road.

Glad to see one car running better.

Great read btw.
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  #74  
Old 09-11-2012, 06:13 AM
N900WM N900WM is offline
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So out of the blue, I ended up meeting a powerplant engineer who used to work for BMW and now works for a large oil company. I asked him about how to prevent the carbon build up in these engines. He said I was fukt as it is a big problem especially with direct injected engines and not just BMW's. He recommend I do two things:
1. watch this link http://www.toptiergas.com/index.html
2. Change the oil more often than every 15K miles.

For what it's worth...
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  #75  
Old 09-11-2012, 07:32 AM
new760Liowner new760Liowner is offline
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Point on the direct injected engines

Problem with Top Tier gasoline is the gasoline never hits the intake valves on a direct injected engine..hence the problem. Doesn't matter how many additives the gasoline has
since if it never hits the intake valves..it won't reduce the carbon buildup.

I do think that more frequent oil changes using an oil with a higher flash point, like Mobil 1 0W40, and maybe a catch can will mitigate how often we pull the N73 intake to check on the intake vales.

At this point, it looks like pulling the intake manifold and cleaning the intake valves will be a maintenance item on the direct injected engines. May want to invest in a carbon blaster or
build one yourself.
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