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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 01-29-2013, 03:37 PM
nr123 nr123 is offline
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Replaced all coils and spark plugs - misfire still - P300 - 760li

I changed all the coils and spark plugs in my 2003 760li about a week ago or so, then today the check engine light comes on, this time its P300, random misfires. In the past it was P0308, mechanic changed the 8th cylinder coil, then it misfired in P0301 mechanic changed all coils and spark plugs - didn't charge me to open it up again.

Today, when I took it to him he said that he would clean out all the fuel injectors using his machine - does that make sense? What would you suspect the cost to be out of curiosity? Thanks!
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  #2  
Old 01-29-2013, 03:43 PM
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Yes that makes sense . Im not sure of cost
Though , Sorry .

You could try buying injector cleaner yourself
& putting it in if his price is to high for you .

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  #3  
Old 01-29-2013, 04:14 PM
nr123 nr123 is offline
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I did buy Techtronic or whatever it's called - and it did help A LITTLE, so maybe that's a good sign that his deep cleaning machine will work better. I am hoping though if a couple injectors are bad that there is a way for him to know which one is bad, I really don't feel like buying 12 injectors!
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Old 01-29-2013, 04:46 PM
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csmeance csmeance is offline
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There could be a lot of reasons for a misfire on the V12 models:

1. Make sure that the intake manifold is torqued down properly and IN THE RIGHT ORDER
2. Make sure that the gasket for the intake manifold and related parts are seated and sealed properly
3. Make sure that the coils/Spark Plugs are good and seated properly.
4. Check the fuel pressure and ensure the HIGH PRESSURE FUEL PUMPS (760 only) are working to spec.
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Old 01-29-2013, 04:49 PM
nr123 nr123 is offline
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Quote:
Originally Posted by csmeance View Post
There could be a lot of reasons for a misfire on the V12 models:

1. Make sure that the intake manifold is torqued down properly and IN THE RIGHT ORDER
2. Make sure that the gasket for the intake manifold and related parts are seated and sealed properly
3. Make sure that the coils/Spark Plugs are good and seated properly.
4. Check the fuel pressure and ensure the HIGH PRESSURE FUEL PUMPS (760 only) are working to spec.
Thanks - but could the fuel injectors be causing the P0300 and rough idle? Also, please keep it clean and don't curse "High Pressure Fuel Pumps" lol
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  #6  
Old 01-29-2013, 04:55 PM
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csmeance csmeance is offline
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Originally Posted by nr123 View Post
Thanks - but could the fuel injectors be causing the P0300 and rough idle? Also, please keep it clean and don't curse "High Pressure Fuel Pumps" lol
They could but there would have to be a LOT of buildup on them. I use Redline SI-1 Fuel Cleaner at LEAST every 5K miles and it works wonderfully on keeping my gas gauge reading right and keeping the car running well.
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Old 01-29-2013, 04:57 PM
nr123 nr123 is offline
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Could the fuel injectors being bad cause the misfire?
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Old 01-29-2013, 04:58 PM
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Quote:
Originally Posted by csmeance View Post
They could but there would have to be a LOT of buildup on them. I use Redline SI-1 Fuel Cleaner at LEAST every 5K miles and it works wonderfully on keeping my gas gauge reading right and keeping the car running well.

So do you highly reccomend Redline ? I was going to use this , but
I have a couple friends that told me its not good ...
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  #9  
Old 01-29-2013, 05:08 PM
nr123 nr123 is offline
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Just a question about the High Pressure Fuel Pump - what are the symptoms? I am hoping of course that it's not this.
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  #10  
Old 01-29-2013, 05:12 PM
Socalbaksh Socalbaksh is offline
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I had a missfire earlier this year in my 760 and it cost me an arm and a leg. Both high pressure fuel pumps stopped working correctly. Replaced both. One of the new ones were bad out of the box and was replaced under warranty. Also check your charcoal canister in your smog system. Supposedly the gas will fill up in there. Warranty should cover that (I think it's 8 years.) I also had the valve cover gaskets and another gasket changed. They had small leaks and would get worse so while it was open I had them change it.
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Old 01-29-2013, 05:14 PM
nr123 nr123 is offline
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Wow - what were the symptoms?
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Old 01-29-2013, 05:16 PM
Socalbaksh Socalbaksh is offline
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Symptom was a hesitation and chugging while your foot was on the brake and rolling a little.
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  #13  
Old 01-29-2013, 05:18 PM
nr123 nr123 is offline
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hmmmm can you explain it a little further please, not sure I understand what's meant by the hesitation and chugging (not to be a pain, just trying to see if I have any symptoms)
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  #14  
Old 01-29-2013, 05:24 PM
Socalbaksh Socalbaksh is offline
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I just saw your evap thread. It's more than likely the fuel pumps. I wish you luck.
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Old 01-29-2013, 05:29 PM
Socalbaksh Socalbaksh is offline
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Rough idle. That rough idle is sped up ( your misfire.) when you just barely lift off of the brake at a stand still is should hesitantly move forward. Your symptoms sound the same as me. Have your mechanic check both pumps. They may be leaking or failing.
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Old 01-29-2013, 05:59 PM
nr123 nr123 is offline
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Now that I am paranoid, I went outside and drove the car up the driveway a little bit, no hesitation, going forward or in reverse. It did say that car must be on to use N, D, or R (something like that), I had to turn it off and back on again.
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  #17  
Old 01-29-2013, 06:17 PM
Socalbaksh Socalbaksh is offline
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Well good luck. Just my $.02 of experience.
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  #18  
Old 01-29-2013, 06:20 PM
nr123 nr123 is offline
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Thanks, I'll post back when I hear from the mechanic. I wonder what symptoms are of the fuel injectors going bad.
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  #19  
Old 01-29-2013, 06:30 PM
nr123 nr123 is offline
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Interesting read about the HPFP http://www.bimmerfest.com/forums/sho...d.php?t=430408

No stalling or anything like that, soooooo just hoping it's not that.
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  #20  
Old 01-29-2013, 07:22 PM
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Quote:
Originally Posted by nr123 View Post
Could the fuel injectors being bad cause the misfire?
They could be the cause or be contributing to them. The only way to find out is to test them or clean them and see what happens.

Quote:
Originally Posted by PAPER View Post
So do you highly reccomend Redline ? I was going to use this , but
I have a couple friends that told me its not good ...
Redline is one of the BEST cleaners on the market. It and Chevron's Techron use PEA cleaners that are GENTLE on rubber and associated parts compared to conventional cleaners like Seafoam, etc that use HARSH SOLVENTS that desolve rubber!

Quote:
Originally Posted by nr123 View Post
Just a question about the High Pressure Fuel Pump - what are the symptoms? I am hoping of course that it's not this.
The symptoms are rough idle, Surging (RPMS's bounce around at a constant speed) for the most part.
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  #21  
Old 01-29-2013, 07:28 PM
nr123 nr123 is offline
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Quote:
Originally Posted by csmeance View Post
The symptoms are rough idle, Surging (RPMS's bounce around at a constant speed) for the most part.
Thanks - how far do the RPM's typically bounce around? Thanks
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  #22  
Old 01-30-2013, 09:00 AM
bayerisheteknik bayerisheteknik is offline
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it could also be a vacuum leak or even a micro crack in any of the valve covers....used to have multiple misfires on my 02 e39...found out after taking valve cover off that someone before me who ever changed VCG had overtighten the bolts and there were micro cracks ...micro cracks=vacuum leak and that can throw misfire DTC as air/fuel ratio is incorrect
good luck
also surging rpm can be anything with fuel,air leak,coils,plugs,maf,tranny
you can see crack in the valve cover where bolt goes through...
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  #23  
Old 01-30-2013, 12:30 PM
rsbolin@me.com rsbolin@me.com is offline
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I have a 2004 760i. Both high pressure fuel pumps have had to be replaced. $2,500 each for the HPFP's. My symptoms were idle surge, stalling, hard starts. Century BMW tested and replaced HPFP on bank 1. Road tested with same symptoms. Now replacing HPFP on bank 2. $3,600 with each service. It is advised to do both HPFP's at the same time. Also, join BMW CCA so that you can get a part price discount. I talked with several independent BMW mechanic shops that said they could do the replacements but they advised to have the dealer do it to get warranty.

Good luck.
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  #24  
Old 01-30-2013, 04:57 PM
bmwoem1 bmwoem1 is offline
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These symptoms sound like carbon build-up on the intake valves, it's very common on these engines. There is even a bulletin for it (I work at a dealer). The best way to clean them is to remove the intake manifold and manually clean them. The fuel system cleaner that is pushed through the injectors doesn't do crap because the N73 is direct injection.
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  #25  
Old 01-30-2013, 05:19 PM
nr123 nr123 is offline
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Originally Posted by bmwoem1 View Post
These symptoms sound like carbon build-up on the intake valves, it's very common on these engines. There is even a bulletin for it (I work at a dealer). The best way to clean them is to remove the intake manifold and manually clean them. The fuel system cleaner that is pushed through the injectors doesn't do crap because the N73 is direct injection.
Will carbon buildup on the intake manifold cause the car to give a P0300 code, or rough idle? When I spoke to the tech at BMW today he mentioned HPFP failure is typically when driving at higher speeds (I get the shaking at speeds of about 30 mph or so).

Also, when changing the coils and spark plugs would the mechanic have removed the intake manifold? I had changed all coils/spark plugs/gaskets. Thanks!
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