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  #11  
Old 02-24-2019, 01:58 AM
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Spoke too soon. Next day 29Cc and 29CD back again. Once when cold and later when hot. A “misfire” is probably not a good description, it is more like a shuddering then the CEL flashes and sometimes goes out but if it stays on the car runs poorly which I assume is “limp home”. If I use my scanner to clear the fault the car will instantly run better. I now carry the scanner in the car at all times. As usual any suggestions would be welcome. In case you are new to the thread here is a summary of what I have done:
Swapped plugs, replaced plugs
Swapped coils, replaced coils
Swapped injectors
Swapped Vanos solenoids, replaced Vanos seals (x8)
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  #12  
Old 02-24-2019, 11:36 AM
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When you say swapped vanos solenoids, you mean you tried new replacements?

Mine misfires, again not really misfiring more like it's retarded timing on the even number cylinders on both banks. Have done all the same swaps and tests as you.

But mine is only on cold starts, the cel sometimes only blinks and goes away or sometimes it blinks and stays on but otherwise shortly after the car drives perfectly regardless of clearing the codes or not.
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  #13  
Old 02-24-2019, 01:22 PM
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I can see you've swapped a few things but still having on-going issue.

Three things to check and/or replace
1. Throttle pedal
2. Brake servo vacuum pump and hose.
3. Oxygen sensors x4

I had minor hesitations before but the O2 sensors was causing it.
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  #14  
Old 02-24-2019, 02:57 PM
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For me it's only on cold start so it is on open loop so it's not using the o2 sensors as far as I know.
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  #15  
Old 02-25-2019, 02:32 AM
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When I say “swapped” I mean swapped position to see if the error code changed but it didn’t, still 29cc and 29cd (cylinder 1 misfire, multiple misfires). Mine idles fine but is definitely more susceptible to misfire when cold although yesterday did it when hot. I will check out the throttle pedal, oxygen sensors and brake servo and hose. I did replace both the “o” rings on the brake vacuum pump to stop an oil leak but no change. I thought an oxygen sensor fault would produce and unique type of fault code.
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  #16  
Old 02-25-2019, 07:30 AM
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Is it possible that a loose connection on the hose from the purge valve could cause the symptoms I am experiencing (see picture)?

https://www.dropbox.com/s/qfzxcvbh7t...82202.jpg?dl=0
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  #17  
Old 02-26-2019, 12:19 AM
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When investigating with my Foxwell NT510 scanner I found some “active” tests you could do which I assumed enabled you to turn various settings/solenoids on and off. I found some tests you could do on Vanos solenoids. When I activated and inactivated the inlet solenoid nothing much happened. When I “activated” the exhaust solenoid I thought there may have been a slight increase in revs but nothing more but when I “deactivated” it the engine immediately stalled. I repeated this procedure several times and it had the same effect?? I still suspect Vanos solenoids to be the culprit. I have ordered four replacements.
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  #18  
Old 02-26-2019, 05:39 PM
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I had left the CEL on for couple of days as I got tired of clearing it constantly but today decided to take a look and P1434 popped up for the first time ever for DTML pump leak.

Might be a false reading but maybe all of my changes finally triggered it and that's where I have a vacuum leak maybe?

Just posting it up. Will have to see if it comes up again.
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  #19  
Old 03-04-2019, 09:16 PM
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Changed my vanos seals, all 4 small and big o-rings. Still get cyl 2, 4, 6,&8 misfires....sad
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  #20  
Old 03-04-2019, 11:45 PM
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New solenoids arrived today but have not fitted them yet. Have ordered a replacement purge valve and hose but they are coming from Latvia so might take a while. I have found that if I put the gearbox in Sport mode I can avoid the problem but the car revs pretty hard and no doubt the fuel consumption suffers.
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