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  #71  
Old 05-18-2018, 01:02 PM
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  #72  
Old 05-23-2018, 08:11 PM
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Quote:
Originally Posted by Bimmer360 View Post
Thank you!
Nope, the people on this forum that gave advice do though!


Also, just to tidy things up. I've put a couple hundred miles on it after a fresh oil change, passed emissions, and did a compression test on Cylinder 1 just now.



Compression Numbers:

Before cleaner / After cleaner / After 'corrective' Valve stem surgery Cyl 1
  1. 55 / 22 / 192
  2. 195 /208 / didn't test
  3. 200 /215 / didn't test
  4. 205 /210 / didn't test
  5. 211 /207 / didn't test
  6. 194 /200 / didn't test
I've been going easy on it for a while, except for the last few miles home today and it seems like everything is normal, for an 11 year old V8. No misfires, no MIL/CEL, no stuttering, no hesitation, no rough idle, no fouling of Cylinder 1 spark plug.


Only issue that's popped up since all this work was a code for Fine Evap leak (P0442 I think). I bought a new gas cap and that appears to have fixed the issue. Hopefully. The old one was original and the seal was really worn out.



I also finally had time to clean off a bunch of grime from the PO's lack of care/old oil leaks (that I fixed) and still need to do some more, but looking much nicer under the hood now.




Now on to all those 'other' codes that need fixing... (windshield washer leak, RLS sensor codes, transfer case oil - 0054C6, TPMS - hoping just a dead battery in one of the sensors)
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  #73  
Old 05-23-2018, 08:16 PM
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Really good to hear!

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  #74  
Old 06-26-2018, 04:43 PM
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Thank you for the Help!!!

I am encountering the same issue. Misfire #2 and #8. I thought I had the seats on straight. But like you said, there is a steep learing curve.

Thanks
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  #75  
Old 09-05-2018, 10:05 PM
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I am helping a friend of my wife's with her 2007/08 X5 3.0si that has a Check Engine light with code P0301 by AutoZone staff. I believe the engine is a 6-cylinder and the code is for cylinder #1 misfire.

I guess a fix starts with checking cylinder #1's spark plug, fuel injection and ignition coil. Please advise on how to identify cylinder #1.

Thank you.
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  #76  
Old 09-05-2018, 10:56 PM
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Originally Posted by xchen View Post
I am helping a friend of my wife's with her 2007/08 X5 3.0si that has a Check Engine light with code P0301 by AutoZone staff. I believe the engine is a 6-cylinder and the code is for cylinder #1 misfire.

I guess a fix starts with checking cylinder #1's spark plug, fuel injection and ignition coil. Please advise on how to identify cylinder #1.

Thank you.
Google. Images. you will get pictures, drwings, firing order, etc. We could tell you but this way you will learn how to fish!

Also, this thread was a great mystery and outcome- but it is a one in 100,000 result. Prolly start your own IMO
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  #77  
Old 09-06-2018, 10:28 AM
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Before posting my request in this thread related to P0301, I did google on the Internet and on this Forum. Two pieces of info appeared to have cylinder placement info: one has 1-2-3 and 4-5-6 replaced in 2 banks parallel to the engine compartment firewall/front bumper, vs my vehicle which has the 2 banks in straight V replacement. The other piece of info has cylinders in V placement but with 8 cylinders.

As I was not getting precise description on the Internet, hence my request for expert advice on this Forum.

As to your suggestion of starting my own IMO, honestly I have not done much work with the model and certainly am not skilled enough to qualify for a meaningful piece yet. I did do a follow-up on water pump and thermostat replacement previously with photos and short description of my get-dirty experience.
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  #78  
Old 10-02-2019, 12:19 PM
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Originally Posted by Toothbrush View Post
Well, you appear to be on to something. Pulled the valve cover off again and took a better look and seems the keepers aren't seated correctly for one of the exhaust valves.

A little bit of relief at the moment, hoping this is indeed the whole issue. Just need to figure out the most expedient DIY to fix it. I guess I'm a sucker for learning the hard way. The up side is this problem has increased the number of tools in my garage, experience, and intimacy with what's under the hood of this X5.

Does anybody know of a way to compress the spring without removing the cam or using the AGA tools? Some variation of a universal spring compressor? I have an OTC 4573 Universal Overhead Valve Spring Compressor, but it's too bulky to work.
Assuming this is the actual problem, once I get this rectified and (hopefully) no longer have a misfire I'll update the thread title/first post for others.
Well, excellent thread, so thank you for taking time to share your experiences. I am afraid that I might be in a similar situation.
I have been doing “projects” on 2009 4.8 X5 for the last couple of weeks (stem valve seals, coolant pipe, cleaned injectors, oil thermostat gasket, obviously all new seals:valve covers, timing chain covers, spark plugs, etc.). Assembled everything yesterday, but got misfires - uneven idling and impaired acceleration. I wiggled the coils, but no change was observed. My plan is to connect to ISTA to see specific codes and what cylinders misfire and then try to swap spark plugs, coils, and listen to injector “clicking” for a troubled cylinder (s). If unsuccessful, I might need to do the compression cylinder test like you had done and then probably take the valve cover off and inspect the keepers and stem valve assembly.


UPDATE: solved the puzzle yesterday. It was actually two issues causing the misfires.
1) driver’s side Vanos soleniods connections were mismatched. Lesson - mark them when disassemble. This particularly important given two sides are connected differently which is counterintuitive. Passenger’s side has short tail going to the top Vanos and on driver’s side the short tail connects to the bottom Vanos
2) once solenoids were connected properly, the misfires had improved, but were still there. Checked the codes with ISTA: misfires multiple cylinders and misfire cylinder #1
3) pulled out the coil from the cylinder #1 and noticed a drop of oil inside the connector. Cyl 1 spark plug was the first one put back in and it probably got a little bit of oil from contaminated spark plug socket the old spark plug tubes were full of oil and the rubber insert of the spark plug socket got soaked in oil as a result. Cleaned everything real good and put back in. Engine started - engine light immediately off and no misfires, took the beast for a test drive around the block - acceleration strong, engine sound as before
Lesson - a little bit of oil in the coil can cause misfires, so clean, degrease tools really well.
4) another lesson learned - when assembling the engine back together don’t try put everything for initial start ( brackets for coils, all plastic engine pieces, reinforcement bar, basically leave out anything that is not critical). Otherwise, if there are misfires, you will need to disassemble again to be able to reach coils, sensors, Vanos, etc.

After the repair, the engine seems pulling stronger. I think the difference is for cleaned injectors that were tripled cleaned with brake cleaner, seaform, and carb cleaner plus new micro filters.

Last edited by Anshev; 10-03-2019 at 11:01 AM.
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  #79  
Old 10-02-2019, 12:39 PM
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Quote:
Originally Posted by Anshev View Post
Well, excellent thread, so thank you for taking time to share your experiences. I am afraid that I might be in a similar situation.

I have been doing “projects” on 2009 4.8 X5 for the last couple of weeks (stem valve seals, coolant pipe, cleaned injectors, oil thermostat gasket, obviously all new seals:valve covers, timing chain covers, spark plugs, etc.). Assembled everything yesterday, but got misfires - uneven idling and impaired acceleration. I wiggled the coils, but no change was observed. My plan is to connect to ISTA to see specific codes and what cylinders misfire and then try to swap spark plugs, coils, and listen to injector “clicking” for a troubled cylinder (s). If unsuccessful, I might need to do the compression cylinder test like you had done and then probably take the valve cover off and inspect the keepers and stem stem valve assembly.

So, in your case, on cylinder 1, the incorrectly installed keepers were not visible and were under the retention plate? Was this valve moving differently compared to others when rotating the engine? What else to look for in stem valve assembly? I assume I would need to take all spark plugs out to prevent hydro locking the engine when rotating - is that true? Had seen it in some stem valve seals video...would rather skip if that is unnecessary.

Also, if you could share some details for cylinder compression test it would awesome since I have never done one myself. What equipment to buy? Thanks in advance!


Which plugs did you install? Maybe the wrong ones? Have you checked for vacuum leaks? I did that work and more myself.


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  #80  
Old 10-03-2019, 11:11 AM
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Originally Posted by Baby Unicorn Taco View Post
Which plugs did you install? Maybe the wrong ones? Have you checked for vacuum leaks? I did that work and more myself.


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Installed Iridium IK20TT 4702 Denso Spark Plugs from eBay.
I was able to solve the misfires after a day of googling, YouTubing...see the original post above.
No, didn’t check the vacuum leaks, there was no unusual whistling sounds and I am actually not sure how to do that.
Is there a good tread/video on checking N62 vacuum leaks? I’d like to do that. I am suspecting that the intake manifold gasket to the block is getting old and it is probably my next project. I was seeing some wetness in that area but not sure what that was: coolant, oil, or just condensation of some sort.
Want to keep this X5 until the “wheels fall off”. The thing that makes it possible is the strong network of owners and abundant amount of information online. Love this about BMW.

Last edited by Anshev; 10-03-2019 at 11:29 AM.
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