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Very rough cold start and cooling problems, code p111b

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871 views 2 replies 2 participants last post by  Lordmoomins  
L
#1 ·
Hi all,

Over the past few weeks my 2007 cooper non-s has had a lot of problems starting cold. The idle is fine for a few seconds, and then splutters/stumbles over itself for a few seconds until it eventually sorts itself out, coming very close to stalling but not quite. It's had an intermittent p111b code that occasionally goes away. I've recently had a full engine rebuild, with new rings, vanos solenoids, timing chain kit, valve cover etc so not sure what could be causing this. I have noticed a small coolant leak near the water pump and the thermostat appears to be stuck open (while looking at the temps after a first start it takes a long time to warm up, and doesn't reach 105° and drop back down to ~50 like it used to) I have these parts on the way, but could that cause the rough idle/running rich engine codes? It ran the same before the thermostat started playing up so I'm really not sure.

ant help would be very appreciated, and I can attach a video of it starting if that would help.
 
M
#2 ·
they do take a lon tome to hit 105c to 112c ie running temps, when i refresh them and do first run up i will let idle for a hour by that time i see around 90c to 100c, then i push them at 2500 revs for two lots of 20 minutes before fan will cut in and out, fan should cut in 110c and deal with the temps by 112c then go back down to 105c , reason why for first hour after refresh on idle is to not hurt the retang rings in ends of camshafts as will cause timing issues if you do, i always replace these rings as old ones pre 2010 are metal and wear the head away, new type are nylon plastic type better but must be treated a certain way when fitted ,
idle could be a load of of things , smoke testing it pcv and inlet and exhaust flexi etc,
p111b
The ECU is seeing a too low of intake air through the reading of the pre-cat O2 sensor. That either means the ECU is trying to adjust for a too rich of burn, or there's a downstream leak in the system.
could also be badly worn vvt motor teeth
 
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