HFC smell? - hard acceleration

blackonorange · 09-23-2012, 03:48 PM

Yea mine does it to , I'm not worried. Kinda smells like a race car

SouthArk370Z · 09-25-2012, 11:06 PM

I sometimes get the same "gunpowdery" smell on hard acceleration in my '09 Touring. My theory is that the cats are temporarily overloaded and I am smelling unburned hydrocarbons and products of incomplete combustion (PIC) (eg, CO, incompletely burned gas, &c) that are making it through the cat. I'm assuming that, with a modern, computer-controlled engine, unburned gasoline will be a very minor component, so PIC will be what is making the smell. YMMV.

nmjaxx9 · 09-26-2012, 01:17 PM

ive noticed that this is only during really hard acceleration though and I mean full throttle pedal to the medal and a couple pulls. Other than that she doesnt burn or smell.

So for now its good, and I think quite normal.

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09-23-2012, 03:48 PM	#1 (permalink)
blackonorange A True Z Fanatic Join Date: Jul 2011 Location: Saskatchewan Posts: 1,078 Drives: 09 370z Rep Power: 18	Yea mine does it to , I'm not worried. Kinda smells like a race car

09-25-2012, 11:06 PM	#2 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324200	I sometimes get the same "gunpowdery" smell on hard acceleration in my '09 Touring. My theory is that the cats are temporarily overloaded and I am smelling unburned hydrocarbons and products of incomplete combustion (PIC) (eg, CO, incompletely burned gas, &c) that are making it through the cat. I'm assuming that, with a modern, computer-controlled engine, unburned gasoline will be a very minor component, so PIC will be what is making the smell. YMMV.

09-26-2012, 01:17 PM	#3 (permalink)
nmjaxx9 A True Z Fanatic Join Date: Jul 2011 Location: Middletown, Ct Posts: 5,853 Drives: 2011 Nissan 370z Rep Power: 28	ive noticed that this is only during really hard acceleration though and I mean full throttle pedal to the medal and a couple pulls. Other than that she doesnt burn or smell. So for now its good, and I think quite normal.