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      06-17-2013, 03:56 AM   #1
DuaneTh
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Engine Misfire on all 8 cylinders - twice

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I have a 2008 E92 M3 with 35,000 kilometers (not miles)

I have had two instances in the past week of the car throwing an engine error code when warming up. The report shows a misfire on all 8 cylinders. On the first instance I had a low fuel level so BMW thought either moisture or possibly something in the fuel. I put in a full tank of E98 but then got another error. The car seems to be running fine and does not miss a beat even during warm up, it is just the light comes on.

I have also noticed a slight knock when the car is warm and idling, it is very slight even to the point I wonder if I am being pedantic but I do notice it. I know my car and there is a knock or rougher idle.

Any ideas? BMW says it is fine and possibly to change the plugs.
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      06-17-2013, 05:22 AM   #2
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I had this issue however only on 2 cylinders.
It was the coils that had failed.

Get coils replaced and injectors replaced and try again.

No harm replacing these items as they are cheap too...
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      06-17-2013, 05:24 AM   #3
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Could be idle control valve, throttle actuator, or oxygen sensors also.
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      06-17-2013, 09:34 AM   #4
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Quote:
Originally Posted by Mike Benvo View Post
Could be idle control valve, throttle actuator, or oxygen sensors also.
^^Happen to me. BMW replaced my throttle actuator while it was under warranty.
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      06-18-2013, 06:27 AM   #5
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Nati Beastcat did yours misfire on all 8 cylinders? and was it during the warm up or while driving? Just curious.

Thanks for all the advice so far.
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      06-18-2013, 05:56 PM   #6
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Quote:
Originally Posted by DuaneTh View Post
All

I have a 2008 E92 M3 with 35,000 kilometers (not miles)

I have had two instances in the past week of the car throwing an engine error code when warming up. The report shows a misfire on all 8 cylinders. On the first instance I had a low fuel level so BMW thought either moisture or possibly something in the fuel. I put in a full tank of E98 but then got another error. The car seems to be running fine and does not miss a beat even during warm up, it is just the light comes on.

I have also noticed a slight knock when the car is warm and idling, it is very slight even to the point I wonder if I am being pedantic but I do notice it. I know my car and there is a knock or rougher idle.

Any ideas? BMW says it is fine and possibly to change the plugs.
I had the same issue. My car is an '07 with just under 38k kms, and during the ownership didn't have a single engine related issue. I had 68 km range left in the car and it was sitting there for over a week. Started the car and instant misfire on cylinder 5. Checked the error codes and two codes were related to the misfire and one talked about fuel filler cap.

Filled a full tank of Shell V-Power (I pump BP Ultimate or V-Power) and cleared the error codes. Drove the car and no problems whatsoever. Last weekend I tracked the car with the fingers crossed. I codes. All good. I think the expansion in the empty tank forced excessive air causing the misfire. I think leaving the tank empty is a big no-no when storing or un driven for a while. Hope this helps.
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Last edited by aussiem3; 06-18-2013 at 06:01 PM.
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      07-01-2013, 06:48 AM   #7
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A few more symptoms. I have been keeping the car with plenty of fuel and monitoring. No more engine errors but I have had 2 instance of DSC Error, Hill Start Error, Tyre Pressure Monitor not working all at the same time. First time it just cleared but came back on today. Engine warning has not come back (yet)

How do you determine if it is the Idle Control, Throttle Actuator, or O2 sensors that are playing up?
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      07-01-2013, 07:47 AM   #8
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Quote:
Originally Posted by DuaneTh View Post
A few more symptoms. I have been keeping the car with plenty of fuel and monitoring. No more engine errors but I have had 2 instance of DSC Error, Hill Start Error, Tyre Pressure Monitor not working all at the same time. First time it just cleared but came back on today. Engine warning has not come back (yet)

How do you determine if it is the Idle Control, Throttle Actuator, or O2 sensors that are playing up?
Gotta get the codes read via OB2. I use Bavarian Technic Tool.
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      07-01-2013, 07:51 AM   #9
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+1 get the codes read (even if you have to go to AutoZone or Advanced or someplace). It will make it a lot easier to trouble shoot.
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      07-01-2013, 11:58 AM   #10
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Get the codes scanned through Bavarian Technic Tool...
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