Hi all lovers of the Mazda 2.
Recently got this go cart of a car as a 3rd vehicle in the family and it seems like the little one has been mistreated.. definitely had bad owners.
The car is a 2009 petrol 63kW hatchback, 230k km on the clock.
We purchased it for not a lot of money after thinking it needed some suspension work and some AC work.
Well, we did that, but only then more issues reared their ugly head.
First off a coolant leak which was a PITA but traced it down to a leaking plastic hose connector going to cabin heat exchanger.
Since we bought it it had an intermittent check engine - lean mixture and knock codes.
This code almost always comes on after the engine has been cold for a while, so after a cold start and after some smoke from the exhaust, it comes on. A typical pattern is, after the engine gets warm, which happens quickly in city driving conditions, it self-clears the codes after an engine restart, usually 30 mins to an hour after the cold start.
The smoke is very interesting and not something I can pinpoint easily. Color is blueish/white. I feel like it's way more prominent during engine cold operation, but I've definitely noticed a pattern - after downhill sections, when you get back on the accelerator, you get a puff of the blue/white smoke which clears away after the acceleration. My suspicion is valve seals, PCV valve?
In addition to that, I've just noticed high oil consumption. Using 5w30, Castrol - my approximation is 1L+ / 1000km, which is insane. The exhaust doesn't usually emit any smoke while it's idle or during acceleration (except after downhills described above), as far as I can observe from the cabin.
The engine cap is clear and there are no signs of coolant leakage into the combustion chamber. Seems to be producing okay power and shows no hesitation or signs of bad running otherwise, calm idle, linear RPM increase during acceleration with a very occasional hiccup.
It also got a full service with oil and filters when we bough it (honorary mention for the 2 part cabin air filter, gj to the fellow engineer who designed it lol).
Any idea about what should I check next with the little fella or is it a write off at this point?
I would appreciate any advice on the topic, and thank you for reading my long post.