Piston Slap: The Importance of A Craigslist 3-Ring Binder

TTAC commentator dtremit writes:

Hey Sajeev —

Inspired by your recent Mazda3 Piston Slap, I thought I’d throw this question your way. Seems like something the B&B might have advice on.

I have a 2005 Mazda6 that is a rather desirable used car…on paper. It is in excellent condition mechanically, and has fairly low miles for its age (about 78k). Single owner, and I have maintained it well, though I am not sure the mess of receipts in the glovebox counts as excellent documentation. I have a good set of Nokian snow tires for it on steel wheels, which would go along with it. It would make a good car for someone for quite some time to come.

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Piston Slap: Start With Spark Plugs!

Done Duratec’d Out? (photo courtesy: Supaman)

TTAC Commentator Supaman writes:

Hi Sajeev,

Haven’t visited TTAC in a while but I’m back! My Mazda 6 has now crossed the 101k mileage marker and all your nuggets of wisdom have helped keep this classic functional and beautiful. However, there’s another problem rearing its head that has plagued even the Mazda forums I’ve visited for a resolution.

It involves the car’s driveability at anything below 3000 rpm. Doesn’t matter whether the engine is just warming up or at operational temperature, the car will hesitate (sometimes violently) in a stuttering/bucking fashion when accelerating from a stop through the gears until I crest that magic 3000 mark on the tach. Out on the highway, passing in top gear is almost impossible because of the engine’s hesitation if revs fall below that number, requiring a downshift to 4th to keep them up. At first I thought my manual skills were to question but then I never started experiencing this issue until around the 87,000 mile mark. It has since gotten worse. Sometimes the bucking is enough to trigger the CEL but then it always goes away after a while.

Browsing the forums I’ve tried everything from cleaning the MAF sensor, fuel injector cleaner, throttle body cleaning as well as replacing the O2 sensor. I’ve narrowed it down to either spark plugs (some forum members replaced theirs but the problem came back hours later), the coils or possibly a vacuum leak. One post I read indicated a potential cylinder misfire. Even Mazda dealers were confounded.

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Review: Mazda 6 S Grand Touring

The Mazda 6 is an enigma. It’s a fine automobile, at least the equal of any car in its segment, as close to a driver’s car as you’ll find in a midsize family sedan. Comfortable, not bad looking, nicely appointed, good fit and finish, great performance, decent economy. There is no question that the Mazda 6 stacks up well in phylum Camcordata yet it sits no higher than 10th place in the family sedan sales race, averaging about 2,400 units a month in the US since the all new 2010 model got up to speed last summer. The midsize segment in North America is the automotive big leagues. The 6 should be fighting for first place, not mired deep in the second division. Product may be everything, but sometimes it’s not enough.

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