Misfire in Cylinder 1 detected- ISTA+ giving too many options-Diagnosed - Bimmerfest - BMW Forums



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  #1  
Old 10-31-2017, 09:12 PM
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AlphaBetaX5 AlphaBetaX5 is offline
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Misfire in Cylinder 1 detected- ISTA+ giving too many options-Diagnosed

Car being driven home after fueling, on a light uphill street, accelerating a bit more to overcome the hill and car laziness, car starts shaking, vibrating, and smelling burned oil, car goes into limp mode (even with more gas, car does not move respectively) and seconds later CEL illuminates.

Car starts normally upon turning off and on, all clear! Car starts moving normally.

ISTA+ shows that the "ultimate code throwing machine" has thrown a misfire in cylinder 1.
Misfire Detection
0029CD DME: Combustion misfires, cylinder 1

There may be several reasons for irregular engine operation and it is often logged as a consequential fault. If fault relating to the following components or systems are stored, then these are in all probability responsible for the misfire:
-Variable camshaft timing control
-Fuel tank level
-Fuel system
-Oxygen Sensors
-Crankshaft sensor
-Injectors
-Variable intake system
-Hot film air mass meter

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Car is:
2009 X5 3.0i, Engine N52
Spark plugs changed few months ago. (ignition coil or harness or boots were not changed.)
MAF function was inspected last week and it operates normally.
Car is sometimes very hesitant, non-responsive, and sometimes operates smoothly. AVG MPG is 10.5.
This is the second time the misfire is happening. First time was during a test drive after I reset throttle response. and since I was playing with ISTA+ service functions, and canceling them, I thought that misfire was because of me playing around with engine and injectors. But I guess it was an actual misfire, I neglected it at that time. I do not remember what cylinder had misfire at that time, going digging my screenshots for that incident.
Update: I found it. It had happened 9 days ago in the same cylinder.

I am going to check those components as ISTA+ recommended, however it is going to take time.



So basically, a misfire in Cylinder 1 happened 9 days ago, and happened today again. Car runs normally in between.
What is my best component to start from?

I appreciate any thoughts

Update:
Issue Resolved as Described Below:
Quote:
Originally Posted by AlphaBetaX5 View Post
So it turned out it was the coil # 1.

Moved spark plug#1 to # 2.
and moved coil#1 to # 3.

Drove the car hard, and replicated it twice! by the second time (plus the original one from yesterday) the CEL became permanent and stayed ON.

Drove home, ISTA+'ed it and misfire in cylinder#3 detected.


Now am shopping around for a whole set of 6 coils! I'm not doing this again for another stupid coil!


Thanks for the helps! Cannot put a value on this forum and the great owners here! I am grateful.

Last edited by AlphaBetaX5; 11-11-2017 at 08:26 PM. Reason: Added Solution
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  #2  
Old 10-31-2017, 10:37 PM
J_ANT$ J_ANT$ is offline
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Mein Auto: '05 X3 3.0i, '08 X5 3.0si
Bad ignition coil? Try swapping the cylinder #1 coil with the cylinder #2 coil and see if the misfire follows over to cylinder #2.
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  #3  
Old 10-31-2017, 10:42 PM
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AlphaBetaX5 AlphaBetaX5 is offline
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Quote:
Originally Posted by jma1992 View Post
Bad ignition coil? Try swapping the cylinder #1 coil with the cylinder #2 coil and see if the misfire follows over to cylinder #2.


Thanks.

The issue is not permanent. It only has happened twice in 10 days.
Unless I try to replicate the fault ( hard acceleration uphills) which the issue still might not happen.




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  #4  
Old 11-01-2017, 03:11 AM
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Doug Huffman Doug Huffman is offline
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10 mpg! indicates to me chronic underlying problems ignored.
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  #5  
Old 11-01-2017, 05:19 AM
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AlphaBetaX5 AlphaBetaX5 is offline
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Quote:
Originally Posted by Doug Huffman View Post
10 mpg! indicates to me chronic underlying problems ignored.


Po has not treated it nicely .

Iíve been chasing this issue for awhile now.


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  #6  
Old 11-01-2017, 10:13 AM
pshovest pshovest is offline
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Quote:
Originally Posted by AlphaBetaX5 View Post
......The issue is not permanent. It only has happened twice in 10 days.
Unless I try to replicate the fault ( hard acceleration uphills) which the issue still might not happen......

Doesn't matter if it's permanent, in all likelihood it will happen again. I would think you would want to replicate the fault unless you don't really want to fix it. Moving the coil & plug starts the process of elimination, so the next time you get the same error you'll know it isn't the coil or plug. Then you can move on to the more difficult & expensive checks like replacing a fuel injector.
This is too simple a problem for ISTA.
When was the last time the MPG calc was reset?
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Old 11-01-2017, 11:46 AM
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AlphaBetaX5 AlphaBetaX5 is offline
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Thanks. Will swap the coil and plug of #1 and 2 today.


Mpg was last reset last week when dealer disconnected battery and everything was reset. It was showing 6mpg for a while until i put 40 freeway miles on it. It went up to 16. Now coming back to 10.


I calculate the mpg manually actually, tank to tank! It is around 10.

Will swap coil and plug today and try to replicate it.



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  #8  
Old 11-01-2017, 03:31 PM
pshovest pshovest is offline
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10 MPG with the 3.0Si..... must be a lot of city driving or your brakes are dragging. I thought my 16 MPG was extremely poor.
Try putting the coil in 2 and the plug in 3. This way you can distinguish between a coil and a plug issue.
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  #9  
Old 11-01-2017, 11:29 PM
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AlphaBetaX5 AlphaBetaX5 is offline
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Quote:
Originally Posted by pshovest View Post
10 MPG with the 3.0Si..... must be a lot of city driving or your brakes are dragging. I thought my 16 MPG was extremely poor.
Try putting the coil in 2 and the plug in 3. This way you can distinguish between a coil and a plug issue.
Ten MPG for pure street driving!

16 freeway! that's all I got! Now with the new increase on gasoline taxes, I am screwed!

I calculate my MPG by refill to refill.
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Old 11-01-2017, 11:34 PM
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AlphaBetaX5 AlphaBetaX5 is offline
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So it turned out it was the coil # 1.

Moved spark plug#1 to # 2.
and moved coil#1 to # 3.

Drove the car hard, and replicated it twice! by the second time (plus the original one from yesterday) the CEL became permanent and stayed ON.

Drove home, ISTA+'ed it and misfire in cylinder#3 detected.


Now am shopping around for a whole set of 6 coils! I'm not doing this again for another stupid coil!


Thanks for the helps! Cannot put a value on this forum and the great owners here! I am grateful.
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  #11  
Old 11-02-2017, 12:02 AM
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AlphaBetaX5 AlphaBetaX5 is offline
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Mein Auto: X5 e70 3.0i
Misfire in Cylinder 1 detected- ISTA+ giving too many options-Diagnosed

I'm not done yet......





While swapping the coils and stuff, noticed this:

Oil leaking from oil filler cap and valvetronic sensor.







What is wrong with my engine? high oil pressure? Oil vent /oil breather blocked? is it only a simple leak? What/where do I need to inspect?


Last edited by AlphaBetaX5; 11-02-2017 at 08:10 AM.
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0029cd dme, cylinder 1, misfire


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