clacking from start with heavy acceleration noise

[nannho]

OK need some help as I checked the TSBs and couldn't necessarily found anything. Scenario is below:

At a light stopped and there is a civil next to me. Light turns green and this guy guns it. He either has the biggest ******* hole in his muffler of no muffler at all. I was on the phone and gunned it to get past this guy, and maybe around 30-50 mph I hear this loud, machine gun, clacking. Very short like 2 or 3 seconds, like 4 to 8 clacks and defiantly from the SHO. It sounded like I put a golf ball in a jar and rapidly shook it back and forth against the glass, or something to that effect.

It was about 40 degrees and clear. Directly prior I was sitting in a lot idling for 10 min or so.

What could this be? Has happened one other time that I can recall.

Knock sensor or condensation on the intercooler? Was slow to shift through as well, as I was getting on it.

Tried to repeat issue and could not. Any ideas?

 

[SHOdded]

Was it like marbles in a jar? That could be one or both converters, which would lead me to suspect leaky injectors (a more common issue than people think). Did you have a loss of power during acceleration at that time? Any fuel smell at all?

Would help to have your SHO's info in the signature area of the post

 

[nannho]

Ya there is always a delay when getting heavy on the gas. And if it was similar to a big marble in a glass jar, sure...very similar sound. I couldn't recall if I smelled any fuel.

Car is a CPO car too.

Car is a 2010. I'll put that detail in. Thanks!

 

[wuzzzer]

I believe I have had that same sound. The shift from 1st to 2nd. I attributed it to the rear differential and traction control limiting power to the rear. it was a loud tick-tick=tick that was coming from the rear of the car.

 

[nannho]

They range was probably first to second...definitely. It happened quick so was hard to pinpoint.

 

[nannho]

happened again and this time the TC was off. it was from a stop to acceleration, in first gear...maybe shifting to second...maybe. And after thinking about it, another variable I noticed is this has happened when the car was shut off off, and I go somewhere. For example, both times, I got into the car and at low speeds (less than 20) and for short time of driving (5 minor so) came to a red light. I stopped, sit, and then when, green accelerate with a little pressure and there is it.

 

[nannho]

I believe I have had that same sound. The shift from 1st to 2nd. I attributed it to the rear differential and traction control limiting power to the rear. it was a loud tick-tick=tick that was coming from the rear of the car.

Any fixes or ideas? anyone else?

 

[SHOdded]

Check engine & transmission mounts, struts/shocks?