Piston Slap: Earth Dreams of Carbon Buildup?
TTAC commentator KCFlyer writes:

Dear Sajeev,

I have a 2015 Honda Fit LX manual, purchased new. From day one I noticed a slight momentary hesitation under moderate acceleration when the engine was cold. I took the car to the dealer after a few weeks but they could not duplicate the problem. I dropped it off again and left it overnight, hoping a cold engine would allow them to experience the issue. No luck.

Fast forward 57,000 miles. Same problem persists and is reported to dealer via phone several times. The check engine light comes on. Dealer says the code means an #3 cylinder misfire. They say the fuel injectors are clogged and charge $1,300 to replace all four injectors. Honda of America throws in $1,000 of goodwill money because fuel injectors are not covered by the 60,000 mile powertrain warranty.

Two weeks later light comes back on. Same code. This time another dealer pulls the head and finds carbon buildup on all four piston heads. They clean up the engine, clean the throttle body and declare the vehicle fixed. Total charges paid for by Honda of America under goodwill claim except $217 for the throttle body cleaning. That was yesterday and I will know within days if the original problem persist.

Tech rep was awesome. He recommends I get the fuel injectors and throttle body cleaned every 30,000 miles. My question, what caused the carbon buildup? Does the buildup damage the engine even if later cleaned up? Should I dump the Fit? It is an awesome commuter. I average 44 mpg summer and 39 winter.

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Bjorn Arnils and Nadine Geary purchased the retired Earth Dreams RA107 Formula 1 car at Bonhams auction in 2010 for £37,000 ($53,110 USD at today’s exchange rates) and set off on a quest to turn it back into a running race car.

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  • EAM3 Learned to drive in my parents' 1981 Maxima. Lovely car that seemed to do everything right. I can still hear the "Please turn off the lights" voice in my head since everyone wanted a demo of the newfangled talking car. A friend of the family had a manual transmission one and that thing was fun!
  • FreedMike That wagon is yummy.
  • Syke Thanks, somehow I missed that.
  • 285exp I am quite sure that it is a complete coincidence that they have announced a $7k price increase the same week that the current administration has passed legislation extending the $7k tax credit that was set to expire. Yep, not at all related.
  • Syke Is it possible to switch the pure EV drive on and off? Given the wonderful throttle response of an EV, I could see the desirability of this for a serious off-roader. Run straight ICE to get to your off-roading site, switch over the EV drive during the off-road section, then back to ICE for the road trip back home.