Engine Ping

SouthArk370Z

Are you sure it's not valve train noise? An OBD/CAN logger that can read the knock sensor variables will verify knocking or not.

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nis350

it was engine pings as it was relatively loud and only occurred during acceleration from dead stop or rolling. There is no warning light or even pending code. My mechanic reviewed the fuel trims and said that it ran lean occasionally which could be the cause of the engine pings.

Engine is smooth and relatively quiet (compared to the Z) and the engine ping doesn't occur under other driving conditions.

Also ran through a few tankful of fuel additives (techron & lucas) and didn't help.

Trips

I personally know what your talking about as I've had this same issue with mine for some time.

At one time I reconnected the O2 sensor from the HFC's, and noticed on my daily morning commute where I would notice it the pinging stopped.

This went on for about 2 weeks but nonetheless it returned.

Im also thinking it has something to do with the O2 sensor intermittently working to cause the off idle lean condition.

I to got not cel and will when I get around to it replace the O2's to see it that will make it go away.

The runs fine but like you know it's just annoying to be pulling from a stop to be pinging like your driving off in the wrong gear.

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nis350

This is my wife's car and it is also an 09 like yours. She said the same about being embarrassed getting that engine pings.

This problem started at about 55 to 60k miles and the car is completely stock.

bad/lazy O2 sensors (pre-cat) can certainly cause a lean condition, but why only occur under 'off idle' situation?

I hope you will find a solution....