#LowTensionPistonRings

Piston Slap: Misfiring on Mazda 3 Skyactiv's Diagnosis?

Brian writes:

Hi Sajeev,

You are my go-to guy for in-depth automotive knowledge. (Wow! Honored. – SM)

My brother has been having a heck of a time with his 2012 Mazda3 Skyactiv. It’s got about 70k miles on it, and in the past 2 years it’s been in and out of the shop. It started with high engine oil consumption (more than a quart per 3k miles, and going up to this day). Then the ignition coils needed to be replaced. Then the MAF and oxygen sensors needed to be replaced. Right after those were fixed, he had to take it back to the shop because there is now a misfire in one of the cylinders.

What’s going on here? My only guesses are worn piston rings causing engine oil to run into the combustion chamber (then down the exhaust and ruining the O2 sensor), or malfunctioning PCV, a broken EGR system, intake valves with a lot of carbon deposits, or simply “bad luck” with this car.

Hope you are able to shed some light on this mystery. Thanks!

Sajeev Mehta Apr 13, 2018

Recent Comments

TheEndlessEnigma Of course they should unionize. US based automotive production component production and auto assembly plants with unionized memberships produce the highest quality products in the automotive sector. Just look at the high quality products produced by GM, Ford and Chrysler!
Redapple2 Got cha. No big.
Theflyersfan The wheel and tire combo is tragic and the "M Stripe" has to go, but overall, this one is a keeper. Provided the mileage isn't 300,000 and the service records don't read like a horror novel, this could be one of the last (almost) unmodified E34s out there that isn't rotting in a barn. I can see this ad being taken down quickly due to someone taking the chance. Recently had some good finds here. Which means Monday, we'll see a 1999 Honda Civic with falling off body mods from Pep Boys, a rusted fart can, Honda Rot with bad paint, 400,000 miles, and a biohazard interior, all for the unrealistic price of $10,000.
Theflyersfan Expect a press report about an expansion of VW's Mexican plant any day now. I'm all for worker's rights to get the best (and fair) wages and benefits possible, but didn't VW, and for that matter many of the Asian and European carmaker plants in the south, already have as good of, if not better wages already? This can drive a wedge in those plants and this might be a case of be careful what you wish for.
Jkross22 When I think about products that I buy that are of the highest quality or are of great value, I have no idea if they are made as a whole or in parts by unionized employees. As a customer, that's really all I care about. When I think about services I receive from unionized and non-unionized employees, it varies from C- to F levels of service. Will unionizing make the cars better or worse?

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Piston Slap: Misfiring on Mazda 3 Skyactiv's Diagnosis?

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