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  #1  
Old 11-17-2014, 07:17 AM
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E70 misfire on cylinder 1

Just got an E70 4.8. First BMW love it but.... I have an engine light that comes on after it sits overnight. "Cylander 1 misfire" the car stumbles and runs rough. After 1-2 minutes I shut the car off and turn it back on and it runs fine.
I have taken the coil and the spark plug and switched them over to cylinder 5 and still get a code for "cylander 1 misfire"
What should I try next? Could it be my fuel injector? Why would it fail on cold start only? I read maybe the injector could be leaking gas into the engine and cause a misfire on startup. It does start up right away and doesnt crank over too much before starting. No black smoke out the tailpipe either. Plug looked clean.

Not sure if I should just change one injector? Can I get the fuel rail off the others enough just to change the cylander 1 injector without pulling the other injectors out? I would probably need the top gaskets for the others on that side.

Any advice would be appreciated.
Thanks
Marcus

Last edited by Markyboyslm; 11-23-2014 at 06:34 AM.
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  #2  
Old 11-23-2014, 06:36 AM
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Old 11-24-2014, 03:43 AM
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I would do valve adjustment before changing injectors.
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Old 11-26-2014, 01:04 AM
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Wouldn't the valves affect more than one cylinder? It has only ever been misfire on cylinder one. I don't hear any clicking coming from the engine.
Trying some fuel injector cleaner before I rip it apart. Just got this vehicle so I don't know the history.


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Old 11-26-2014, 02:59 PM
ard ard is offline
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Skip the valve adjustment....

Miles? Age?

Do you have BMW software and cable? I believe there may be a way to look at injector timing, etc, to see if something unusual is going on there. There is a gernman terms called "Running Unrest".. a measure of the acceleration of the crank after each firing, a measure of unbalanced cylinders. Ive used this to track down bad coils.

NOTE. I had a bad coil in an s62, when I switched positions the problem moved but NOT precisely. This is because the algorithm is inductive (it looks at crank motion, and decides what coil must have caused the lack of accel) ...not an email from Cyl 1 saying "i am bad"... your issue may be the coil prior to that cyl (in the firing order) causing the DME to misdiagnose the source of the misfire... by finding the firing order and choosing your coil swaps, you can get better diagnostics
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Old 11-27-2014, 10:12 PM
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87000km 2007
I switched the coil from 1 to 5(other side of the engine on the front) I wonder if I would have a different code if I changed it with number 3?? 5 does fire right after 1.
That might be an interesting test. Thanks for that info.

I have BMWhat app for android and Dash Commander for reading codes

BMWhat has a section under Parameter that has a "Running unrest filtered"
for each cylinder. Values varied for each cylinder evenly across the 8 cylinders. Not sure what the values should be but they all seemed the same 0-181/sec.

If I let the car idle in the morning for 2 minutes the misfire doesn't occur.
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Old 11-28-2014, 01:27 AM
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have you moved the spark plug around?
have you replaced spark plugs?
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Old 11-28-2014, 01:33 AM
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I did move coil and plug from cylinder 1 to 5
Plugs looked clean. Going to try and switch them to cylinder further away in the firing order to see if the code changes.


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Old 11-28-2014, 05:45 PM
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Almost sounds like contact related issue.
As in the voltage is getting too low or the contact connecter that is plugged into the coil is loose (I mean the metal part internal to the connector).
Do you see any oxidation on the connector?
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Old 11-29-2014, 01:15 AM
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Going to have another look at the coils and connectors tomorrow.
This morning I did have another light come on right after startup. It was a traction control abs light malfunction. I had no power steering until I read that if you turn the steering wheel all the way left and right and it said initializing and the light went away. I also read that this and other warning lights may be a result of a weak battery. Could the misfire be caused by a weak battery? Doubt it, but don't know much.


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