Mini Cooper R56 1.6 2007 - Code 2771 combustion misfire cyl 1 #
Posted by Dominic Casey on May 19, 2018, 4:36 pm
Year of Manufacture *: 2007 Engine Size and Code *: 1598cc Engine No. B094H911 ( Optional) Fault Codes: 2771 Combustion Misfire Cyl. No. 1
Hi All,
Can anyone please help me with this problem? Mini cylinder No. 1 misfire when engine warmed up. The car had high oil consumption, so I had the cylinder head rebuilt in the machine shop and fitted new piston rings. The car is fine until it warms up and then starts misfiring at idle on Cyl. No. 1 showing the above code. I have swapped the coils and injectors, but the misfire stays on Cyl. No. 1. I was wondering if anyone has come across this problem before. Thank you very much in advance.
Best regards,
Dominic Casey
Re: Mini Cooper R56 1.6
Posted by Dominic Casey on May 22, 2018, 11:46 am, in reply to "Mini Cooper R56 1.6" Dominic Casey
Update on Mini R56. The compression readings are very irregular.160 psi across all 4 cyls when engine is cold. When engine is warm and starts to missfire on cyl 1 the compression can drop to 75 psi and go back up to 135.Readings aren't constant when the engine is at running temp.Also when I disconnect the valvetronic servomotor at the back of cyl head it can idle normally,reconnect the motor and it still runs fine,then switch it off and restart and missfire is back immediately.I hope I'm making sense here.
Hi All,I decided to have another look at this mini after the workshop quietened down for summer holls. As before the car runs fine when cold and as soon as it warms up miss fire on cyl 1. To recap,the head has been done,valve seats checked and all good.New set of rings,vanos units changed,solenoids checked,injectors switched around,ecu replaced with a known good unit,coil packs and plugs replaced. Cyl head off again to see was anything missed. But all good.Now I have discovered that when i disconnect one of the cam sensors the car runs fine.It starts, runs like a new watch.not even a hint of a miss fire, idles like a new born baby. The only indication of a problem is engine light is on. I've been driving this car for a few days now and not a hiccup. Connect the cam sensor back up and we're back to square one.Can anyone throw some light on this.
Thanks in advance
Dominic casey
Re: Mini Cooper R56 1.6
Posted by Graham Bullock on July 11, 2018, 8:46 pm, in reply to "Re: Mini Cooper R56 1.6" Graham Bullock
You say, when one of the cam sensors is disconnected' Does it matter which one or is it always the same one?
It must be seeing something it doesn't like, can you scope the other sensors and see if anything changes when you re-connect the suspect cam sensor.
Graham
Re: Mini Cooper R56 1.6
Posted by gary fear on July 18, 2018, 7:42 pm, in reply to "Re: Mini Cooper R56 1.6" Gary Fear
hi
we had the same problem after a head repair .ended up the valve lifter followers are graded and the ones the engineering shop used aren't . replaced them with good used genuine mini ones of the same grade and all sorted. we found the problem by manually winding the cam lftmotor from one extreme to the other and measuring the valve lift .
on May 22, 2018, 11:46 am, in reply to "