i recently installed a header and since then ive been hearing this weird noise.. sorta random but only when im gasin it.. sounds like a blow off valve.. real quick release of pressure.. sounds like if were to 'pssstt' as in "hey you".. anyway not sure how to diagnose.. im going to see if i can tighten the header down some more..

anyone ever heard this before?

 

Did you be sure to use a gasket between the header and the head? Is everything torqued down propperly?

 

Did you torque the bolts down?

Did you install an intake?

 

check that nothing is leaking.

 

if you have a shortram intake thats what it is..mine does the exact same thing

adaM

 

i reused the old gasket it looked nice and clean..
and yes i have an aem cai

 

if the old gasket was fine and you see no leaking its your intake and you should have no worries my friend

adaM

 

may i ask how i would be able to tell if its leaking??

 

Did you install the gasket that goes between the header and the cat (reuse the stock one) ?

 

reused the old one.. sorta weird in shape .. wedge like..

 

I had the same thing after I ported my intake manifold. At certain parts of the throttle it would make a Pssssttt noise.

 

ok well to what torque do i tighten the header bolts??
and wow you guys are responsive!!! awesome!

 

yea i wouldn't worry about it. Its probably just your intake if you can't find any leaks anywhere. My intake makes that sound at partial throttle.

 

well if i hold the throttle steady it does it too.. just a quick short pssstt.. not constant.

 

does it sounds like a mini-backfire right when you shift? thats what mine does (i have straight pipin tho ) and i was told that it is from extra pressure.

keep riding your car and youll find out when you need to shift/how to shift without making that noise. Either quick shift and dont let up on the gas for more than you have to (which will sometimes still "pop") or just slow down lol.

 

its automatic.. usually happens after its in gear for afew secs.. not at any particular rpm just under load