Slight hissing on acceleration when cold

babbagandu · 01-06-2013, 10:45 PM

I was wondering if this is possibly an exhaust leak? It only happens within the first couple minutes when I start the car. I'm guessing when the pipes warm up they expand slightly and seal the leak? It sounds similar to the hiss on deceleration and I only really hear it under moderately high to high throttle. It seems pretty harmless but just wanted to ask

DEpointfive0 · 01-06-2013, 11:05 PM

Hi flow cats?

If you have high flow cats, that's your sound

/endthread

babbagandu · 01-07-2013, 09:18 AM

you're talking about acceleration right? I know it's normal in deceleration with hfc but that's not what I'm talking about

edub370 · 01-07-2013, 09:36 AM

Not normal on accel. may wanna check for a leak

babbagandu · 01-07-2013, 09:46 AM

Quote:

Originally Posted by edub370

Not normal on accel. may wanna check for a leak

That's what I thought. Only thing is like I said I only hear it within the first couple minutes of driving so I wonder if it's a big deal

SouthArk370Z · 01-07-2013, 09:58 AM

Quote:

Originally Posted by babbagandu

That's what I thought. Only thing is like I said I only hear it within the first couple minutes of driving so I wonder if it's a big deal

If it's a leaking gasket, the exhaust gases will erode the gasket (and possibly the flanges) and it will just get worse.

TeamARK · 01-07-2013, 11:36 AM

Do you have any aftermarket parts on your car? This would help in finding the source to your hiss.

01-06-2013, 10:45 PM	#1 (permalink)
babbagandu Enthusiast Member Join Date: Mar 2011 Location: US Posts: 349 Drives: 09 Nismo Rep Power: 14	Slight hissing on acceleration when cold I was wondering if this is possibly an exhaust leak? It only happens within the first couple minutes when I start the car. I'm guessing when the pipes warm up they expand slightly and seal the leak? It sounds similar to the hiss on deceleration and I only really hear it under moderately high to high throttle. It seems pretty harmless but just wanted to ask

01-07-2013, 09:36 AM	#4 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 20	Not normal on accel. may wanna check for a leak __________________ 09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways 326whp/268tq

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01-06-2013, 11:05 PM	#2 (permalink)
DEpointfive0 A True Z Fanatic Join Date: Jan 2012 Location: SoCal Posts: 14,824 Drives: a lot Rep Power: 17152	Hi flow cats? If you have high flow cats, that's your sound /endthread

01-07-2013, 09:18 AM	#3 (permalink)
babbagandu Enthusiast Member Join Date: Mar 2011 Location: US Posts: 349 Drives: 09 Nismo Rep Power: 14	you're talking about acceleration right? I know it's normal in deceleration with hfc but that's not what I'm talking about

01-07-2013, 11:36 AM	#7 (permalink)
TeamARK Track Member Join Date: Jul 2009 Location: CHINO Posts: 957 Drives: Black 350z/370z Rep Power: 17	Do you have any aftermarket parts on your car? This would help in finding the source to your hiss.