Hissing Noice From Near Injectors

[frozenwaffles]

hey guys, i have this hissing noice comming from around my intake pleanum area, right near the injectors...

i have replaced or cheacked all my hoses comming off the plenum and i am 99% sure its not the plenum gasket.

i asked my mechanic what the go was and he said he has head it befor and its a not a gasket leak...he isnt 100% sure what it is but...he has heard it before....

anyway do you guys have or know this sound? its very faint, not loud like a proper air leak....and you can just hear it over the injectors ticking away...

i'm going to do a smoke test to see if i can see smokbeing sucked intot he engine somewhere....will let you know how i go...

[GeeTR]

Spray brake cleaner at the injectors and watch if the revs pick up. Maybe injector seals? I had a similar issue.

[frozenwaffles]

yeah i have heard this noise since day 1 of owning the car and i have changed the injectors to new nismo ones...

are you talking about the large rubber seals that go between the injectors and the plenum or the actual injector seals...upeer and lower?

[Jmaac]

All of them. Did u lube them up before you replaced them? they tend to roll and not sit properly if u dont...

[GeeTR]

yeah i have heard this noise since day 1 of owning the car and i have changed the injectors to new nismo ones...

I had my issue from the day it left the boat in QLD.

...are you talking about the...

Yup, all and any. Spray everything, I used a whole can around my engine. My issue (car not mental) was compounded by a leak in the throttle body <-> plenum fit, as well as where the throttle plate spindle protrudes from throttle body (RB26)

Good luck

[RANDY]

I've been wondering about that noise for some time now... I think it's just normal air sounds wooshing through the plenum or something? I have no car issues, no lag, no surging or anything... just that feint hissing noise.

Once, I didn't seal my catch-can properly after emptying it, and there was a VERY LOUD hissing noise afterwards (and the car barely idled, but that is too obvious).