Hesitation on a MINI One
Discussion
My MINI One has 110,000 miles onto clock but is well looked after and regularly serviced. It drives very well and has been 100% reliable from the day that I bought it brand new in 2007. It has only ever needed tyres and routine servicing.
Recently it has started to show an odd symptom, like a very slight stutter or momentary hesitation, particularly when accelerating. At first I thought it might need the injectors cleaning but I have run some cleaner through and it made no difference. In an older car I would suspect a failing spark plug but these have always been changed as scheduled and new ones are not due. The fault is unpredictable and intermittent. Does anyone have any ideas as to what this could be?
Oily
Recently it has started to show an odd symptom, like a very slight stutter or momentary hesitation, particularly when accelerating. At first I thought it might need the injectors cleaning but I have run some cleaner through and it made no difference. In an older car I would suspect a failing spark plug but these have always been changed as scheduled and new ones are not due. The fault is unpredictable and intermittent. Does anyone have any ideas as to what this could be?
Oily
The car hesitation got to the point of the MINI not being able to tick over. It went in to Mini dealer today and they diagnosed an oxygen sensor failure and said that the computer was also suggesting problems with solenoids in the intake and exhaust BUT that this could be a false reading caused by the faulty oxygen sensor.
They changed the oxygen sensor and it ticks over and runs well now but there is still this occasional missing of the engine. In a 35 mile trip it will misfire about 50 times. Not predictable and totally intermittent. On an old 1960's car I would say that it was as if a spark plug was breaking down but these have been regularly changed and should be fine.
Oily
They changed the oxygen sensor and it ticks over and runs well now but there is still this occasional missing of the engine. In a 35 mile trip it will misfire about 50 times. Not predictable and totally intermittent. On an old 1960's car I would say that it was as if a spark plug was breaking down but these have been regularly changed and should be fine.
Oily
Sounds silly but try giving it an oil and filter change, i had one of these a while back with oxygen sensor and valve timing codes and this cured it. I think for some reason the oil quality was causing the valve timing solenoids to play up, these do have gauze like filters in them that can be cleaned out too.
MINI went back into MINI Dealer on Monday. £438 later they had changed the electronicThermostat and both inlet and exhaust Solenoid Valves.
We drove the car away and before we got home it was 'missing' again! We have now spent over £1250 with MINI in the last month most of it on curing 'problems' that they diagnose with their computer but which don't actually address the fault with the car. The sickening thing is that they act as though the car having a problem is our fault and we should be grateful that they are curing all these apparent deficiencies!!!!
Before it went to them for rear brakes and an oil change it was running perfectly.
They collected the MINI this morning (Wednesday) and have taken it back in to try and find out what is wrong with her (again).
Oily
We drove the car away and before we got home it was 'missing' again! We have now spent over £1250 with MINI in the last month most of it on curing 'problems' that they diagnose with their computer but which don't actually address the fault with the car. The sickening thing is that they act as though the car having a problem is our fault and we should be grateful that they are curing all these apparent deficiencies!!!!
Before it went to them for rear brakes and an oil change it was running perfectly.
They collected the MINI this morning (Wednesday) and have taken it back in to try and find out what is wrong with her (again).
Oily
Abagnale said:
Not sure if yours has the same set up as my Cooper S, but I experienced the exact same symptoms as you & cured it by changing the coil pack. Four bolts & done. Sits above the exhaust manifold.
This^^^^
I work for mini and without taking a look this would be my best guess with the symptoms you describe it would be worth changing the ht leads to, also check the plugs just because their not due doesn't mean to ignore them
The car came back from MINI (with no additional charge). They told me that they had failed to "set the electronic thermostat correctly' and this had caused the hesitation problem.
Being a suspicious person I wonder whether there was actually another fault that they found but that they should have found earlier and they didn't tell me as they knew I would complain about the additional costs I have had to incur!!!!
Either way the car is now running like a dream. Thanks to all for your input and suggestions.
Best Wishes,
Oily.
Being a suspicious person I wonder whether there was actually another fault that they found but that they should have found earlier and they didn't tell me as they knew I would complain about the additional costs I have had to incur!!!!
Either way the car is now running like a dream. Thanks to all for your input and suggestions.
Best Wishes,
Oily.
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