'13 Mazda 2.2 diesel - what's gone wrong?
Discussion
I appreciate that diagnosing issues aren't always possible over the 'net however I thought I'd ask anyway...
Car- '13 2.2 Skyactive diesel Mazda 6 with a manual 'box.
Symptoms - fast idle on start up when cold with occasional puff of blue from the exhaust, revs settle within maybe 5-10sec.
Usually a slight wiff of burnt oil when parked up and walking away from the car.
Slight stutter (like a misfire) under light throttle, though this isn't frequent.
Lastly, when the engine is warm and the clutch peddle pushed to the bulkhead (waiting at a junction, for example) all is well. Leave the gearbox in neutral and the clutch in it's rest position the engine, after maybe 20sec or so, starts to lightly stutter (as if it's having a think about stalling) and plumes of blue smoke from the exhaust become evident - push the clutch pedal to the bulkhead and both issues disappear! I'm aware that the blue is oil.
So, anyone care to have a stab as to what's happening as well as inform me how far up s
t creek I am? 
Car- '13 2.2 Skyactive diesel Mazda 6 with a manual 'box.
Symptoms - fast idle on start up when cold with occasional puff of blue from the exhaust, revs settle within maybe 5-10sec.
Usually a slight wiff of burnt oil when parked up and walking away from the car.
Slight stutter (like a misfire) under light throttle, though this isn't frequent.
Lastly, when the engine is warm and the clutch peddle pushed to the bulkhead (waiting at a junction, for example) all is well. Leave the gearbox in neutral and the clutch in it's rest position the engine, after maybe 20sec or so, starts to lightly stutter (as if it's having a think about stalling) and plumes of blue smoke from the exhaust become evident - push the clutch pedal to the bulkhead and both issues disappear! I'm aware that the blue is oil.
So, anyone care to have a stab as to what's happening as well as inform me how far up s
t creek I am? Edited by CardShark on Friday 23 September 21:39
Edited by CardShark on Friday 23 September 21:40
Well the oil level isn't dropping despite the fact that something's burning off, I've briefly read about the issues you mention.
It's the smoking at idle with the clutch engaged and .'box in neutral vs not smoking with pedal to bulkhead that's really puzzling me. Probably a straight forward reason, though!
It's the smoking at idle with the clutch engaged and .'box in neutral vs not smoking with pedal to bulkhead that's really puzzling me. Probably a straight forward reason, though!
If its burning oil as evidenced by the blue smoke yet the oil level isn't rising i'd be worried that unburnt fuel is gradually replacing the oil.
I'd be inclined to give it an oil change and see if that makes any differene, even if it doesn't you've stopped further damage to bearings etc if oil dilution is a thing.
I'd be inclined to give it an oil change and see if that makes any differene, even if it doesn't you've stopped further damage to bearings etc if oil dilution is a thing.
CardShark said:
Well the oil level isn't dropping despite the fact that something's burning off, I've briefly read about the issues you mention.
It's the smoking at idle with the clutch engaged and .'box in neutral vs not smoking with pedal to bulkhead that's really puzzling me. Probably a straight forward reason, though!
Just to point out, the issues that often get mentioned are due to failed regen cycles in which extra fuel is added to the combustion. Over time it dilutes oil, thins it and stops it lubricating. The oil level not seeming to drop could be down to the fact that burnt oil is being replaced by diesel.It's the smoking at idle with the clutch engaged and .'box in neutral vs not smoking with pedal to bulkhead that's really puzzling me. Probably a straight forward reason, though!
I’d drop the oil and see what it’s like. Check for viscosity and dieselly smell etc.
No matter what the cause in the difference in smoke levels between clutch up or down is, I’d be more concerned by the presence of any blue smoke at all and start the diagnosis there.
Never had a Mazda but read dozens of posts on various forums from owners about the Diesels in these tending to have repeated failed regens, which sends unburned fuel down into the sump.
Many engines failed due to excess wear caused by such contaminated oil, which can of course lead to the engine running away consuming its own oil (now highly mixed with fuel) until its destroyed.
As for regens in general.
Why didn't all makers come up with at least a warning that a regen was taking place so owners had the opportunity to continue driving so it could complete.
Why isn't condition of the DPF filter able to be pulled up on the dash menu, this is the case on many trucks, also why can't the owner cancel a regen immediately it starts if inconvenient, or trigger a regen once suitable, or indeed trigger a static regen once parked in a safe place, again variations on this theme found in many trucks.
Far as i know the only domestic use vehicle that has been fitted with an owner triggered static regen facility is the 2.8 Diesel as found in Hilux and 150 series Landcruisers.
I refuse to accept what i think is reality here, that makers assume their buyers are too thick to be able to manage their own DPF regens in a sensible way, whilst that may indeed apply to some many others would understand and appreciate being able to keep their vehicles in good order.
Whilst 35 miles is indeed probably far enough, by the time the exhaust is hot enough for regen you might be 25 miles into your journey and may not realise a regen has just started therefore maybe have stopped it multiple times mid flow, all for the sake of a warning lamp or dash message.
Note the exhaust will be very hot during a regen so some thought should be given to where one parks, i've had to cancel a regen a couple of times with my truck because i discharge beside explosive atmospheres.
Many engines failed due to excess wear caused by such contaminated oil, which can of course lead to the engine running away consuming its own oil (now highly mixed with fuel) until its destroyed.
As for regens in general.
Why didn't all makers come up with at least a warning that a regen was taking place so owners had the opportunity to continue driving so it could complete.
Why isn't condition of the DPF filter able to be pulled up on the dash menu, this is the case on many trucks, also why can't the owner cancel a regen immediately it starts if inconvenient, or trigger a regen once suitable, or indeed trigger a static regen once parked in a safe place, again variations on this theme found in many trucks.
Far as i know the only domestic use vehicle that has been fitted with an owner triggered static regen facility is the 2.8 Diesel as found in Hilux and 150 series Landcruisers.
I refuse to accept what i think is reality here, that makers assume their buyers are too thick to be able to manage their own DPF regens in a sensible way, whilst that may indeed apply to some many others would understand and appreciate being able to keep their vehicles in good order.
Whilst 35 miles is indeed probably far enough, by the time the exhaust is hot enough for regen you might be 25 miles into your journey and may not realise a regen has just started therefore maybe have stopped it multiple times mid flow, all for the sake of a warning lamp or dash message.
Note the exhaust will be very hot during a regen so some thought should be given to where one parks, i've had to cancel a regen a couple of times with my truck because i discharge beside explosive atmospheres.
Edited by Smint on Monday 26th September 11:13
Edited by Smint on Monday 26th September 11:15
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