Misfire after hard acceleration
Hi guys. Has anyone experienced 29d2 misfire on cyl 6 after hard acceleration? Initially, I had a whole host of errors related to the vvt solenoids so I replaced both. Now the vvt errors are gone, but it is still running rough. I replaced all 6 injectors and swapped around the plugs and coils, but the misfire stays on the 6th cyl. If I start the car and drive easy, it runs great, no code. As soon as I floor it and accellerate through third gear, the check engine light comes on and it throws the 29d2 code. Any ideas? I would think wiring, but it comes and goes. 2007 530xi auto
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I had a similar issue, start with your coil packs, swap say pack 1 with 6 and see if the problem folkows. I ended up having 2 bad coil packs that had failed due to oil pooling in the spark plug wells from a bad valve cover gasket.
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Been trying to come up with some ideas for you but I can't get past this:
Now the only issue left is it is running rough. I replaced all 4 injectors and swapped around the plugs and coils, but the misfire stays on the 6th cyl. If I start the car and drive easy, it runs great You replaced all 6 injectors with new ones? |
Originally Posted by antho3024
(Post 1593397)
I had a similar issue, start with your coil packs, swap say pack 1 with 6 and see if the problem folkows. I ended up having 2 bad coil packs that had failed due to oil pooling in the spark plug wells from a bad valve cover gasket.
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Originally Posted by NoQuarter
(Post 1593402)
Been trying to come up with some ideas for you but I can't get past this:
is it running rough or not? or is it only running rough when you get the misfire? You replaced all 6 injectors with new ones? |
Originally Posted by antho3024
(Post 1593397)
I had a similar issue, start with your coil packs, swap say pack 1 with 6 and see if the problem folkows. I ended up having 2 bad coil packs that had failed due to oil pooling in the spark plug wells from a bad valve cover gasket.
|
Originally Posted by NoQuarter
(Post 1593402)
Been trying to come up with some ideas for you but I can't get past this:
is it running rough or not? or is it only running rough when you get the misfire? You replaced all 6 injectors with new ones? |
what is the history prior to this problem?
Ran perfect for a long time then suddenly this misfire? |
Has run well for the last 6 months, but as we all know, these things are money pits. I have had it for 2 years 20,000 miles and I have had to do more to this car than any other I have owned. Trans valve body and all related mechatronics rubber, much of the cooling system starting with water pump, engine gaskets, all of the front control arms, started, front drive shaft......
I have had tons of bmws and Audi’s and this one has got to be the worst. BUT, it drives like a dream. That said, I have impa and Carley, but I am not very good at using them. Any suggestion on how I can use these tools to troubleshoot this problem? |
If you are quite certain you have eliminated all possibility that it is not due to coil/plug/injector then
1) It is still something specific to that cylinder, such as DME circuits that drive that coil/plug? coil pack wires valves cylinder ?? I would get it out on the road and force the misfire numerous times to try and determine if it is indeed always and only a cyl 6 problem. |
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