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!

Read more
Piston Slap: Fix My Beeeemer, Sanjeev!

Nitin writes:

Sanjeev,

I read your blog about the problem in BMW. I have a 2009 BMW 535i X drive with turbo. The car just ran out of warranty and has 45000 miles only. My car started having engine problems last week. First, the BMW said it needs new spark plugs as they were dirty. That cost me $740 dollars. That did not work. They said it needs new fuel injectors. That was another $2100 dollars.

Read more
  • Jeff S I rented a 2012 Chrysler 200 with the 4 cylinder from Enterprise for business travel and it was not a bad car but I would not buy one. I would have picked a Honda Accord, Toyota Camry, or a Ford Fusion over a Chrysler 200. I have known people that bought Chrysler 200s that had nothing but problems with them. I appreciate these old reviews and miss the old TTAC before it became what it is now with many articles that are slanted toward politics. Don't have to agree with everything but it is good to read an honest review of a car.
  • Jeff S The Cybertruck was first unveiled and announced on Nov. 21, 2019. For over 3 years Tesla has been saying that this truck was going to be released soon. The mystique and surprise is no longer there. I think the Cybertruck is hideous but then I am not the target for this. Since its initial unveiling there has been the introduction of the Lightning, Hummer, and the Rivian truck. The anticipation of this truck and the mystique has faded. There will be a few that will buy this because they are hard core Tesla fans and some because it is different but Tesla should have been the first to market an EV pickup. GM is planning a compact EV pickup under the GMC brand starting at 25 MSRP. This should have been Tesla and Tesla could have downsized the Cybertruck to either a midsize or compact truck and been first. Tesla should have been first at the very least to release a smaller EV truck.
  • Bloke Wow, this should make a big difference, to those catalytic converter thieves who don't have tools like 'angle grinders' with them.
  • Carlson Fan The way the truck drops in the rear and the bed/tailgate become a ramp is genius! I'd buy it just for that alone!!! It would be awesome for loading snowmobiles and garden tractors in the back. However, my trucks need to be able to regularly tow heavy loads long distance, summer & winter. Sorry folks, current battery tech. isn't even close to what it needs to be for me to think even one second that a battery truck could replace my current ICE powered truck. An EV for a DD makes sense , but for truck you need a MUCH better battery.
  • Inside Looking Out For midsize sedan it is too small. It basically is a compact car.