Hey guys,
I've got a "misfire on Cylinder 6 (P306) that comes up if i leave the car to idle when cold. If i drive away immediately from starting, it never comes up, and if i reset the code using an ODB2 reader then it goes away and doesn't come back unless i leave the car idling for >30 seconds when cold.
The car is also not perfect even when warm, big flat spot around 1800rpm etc and sounds a little rough.
I change the coil pack on what i thought was the 6 cylinder, and the car DID seem a lot better after, but a week later it's as bad as ever if not worse! Which one is cylinder 6? I have taken it to be the one closest to "firewall"...is this right? If not, it may have been just placebo! I have an m54b30 engined 2003 Z4 3.0i
Any help is appreciated.
Thanks,
Tom.
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Which cylinder is which, P306 misfire on cyl 6.
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Which cylinder is which, P306 misfire on cyl 6.
2003 E85 3.0 Grey w/ Red
Factory: Heated Memory seats, DSP, Prof. Nav, TV, Cruise, Bi-Xenons, PDC, Cruise Control, Wind Diffuser
Mods: Gaptech RCH+, MSport Mfunction Steering Wheel, ZHP Stubby knob, black gaitors
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- Lifer
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Re: Which cylinder is which, P306 misfire on cyl 6.
#1 nearest the front bumper
#6 closest to the driver
Although I had a code saying misfire on #4 and it was actually #1 that had the issue.
#6 closest to the driver
Although I had a code saying misfire on #4 and it was actually #1 that had the issue.
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- Posts: 68
- Joined: Sat May 18, 2013 7:38 pm
- Location: Manchester, UK
Re: Which cylinder is which, P306 misfire on cyl 6.
Thanks for that....that sounds brilliant though, how did you diagnose it in the end and was it the coilpack?mmm-five wrote:#1 nearest the front bumper
#6 closest to the driver
Although I had a code saying misfire on #4 and it was actually #1 that had the issue.
2003 E85 3.0 Grey w/ Red
Factory: Heated Memory seats, DSP, Prof. Nav, TV, Cruise, Bi-Xenons, PDC, Cruise Control, Wind Diffuser
Mods: Gaptech RCH+, MSport Mfunction Steering Wheel, ZHP Stubby knob, black gaitors
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- Lifer
- Posts: 12731
- Joined: Sun Nov 30, 2008 1:03 pm
- Location: Liverpool
- Contact:
Re: Which cylinder is which, P306 misfire on cyl 6.
Trial & error as we kept swapping out plugs, coils, etc. on #4 and it didn't seem to make any difference.rG-tom wrote:Thanks for that....that sounds brilliant though, how did you diagnose it in the end and was it the coilpack?
The only thing that made any difference was putting a coil from #2, #3, #5 or #6 onto #1. We'd reset the codes and it would be fine. If we swapped them back (remember, we didn't touch #4 as we thought it was faulty) then the error on #4 came back.
We did this for about an hour, put them all back where they were originally and then put a spare coil pack on #1 and all was fine. We then double-checked by removing the spare coil pack and putting the original back into #1 and this time it didn't bring up any error.
We started & stopped the car a couple of times, took it for a short drive, and everything was still working.
So all I can assume is there was either a dodgy sensor, or the fiddling had put something back in the slightly different position that made it work.
That was about 60k miles ago now and despite carrying a spare coil just in case, it's never missed a beat - other than when I had that useless* Simota intake on.
* supposedly now fixed so that the car doesn't cut out when you floor it down a motorway slip road