I just installed a ported Intake manifold and Fuel rail.

However im having a problem

Upon startup, im hearing a loud hissing noise.
And i am running Lean

What coul this be?


Current mods excluding what is mentioned: Exhaust, Headers, Piggy back, intake, and TB

thanks

 

vacuum line???

 

+1

Check to see what you missed.

 

nah, all lines are connected, i double checked everything.

when i did get a chance to drive, the hissing seemed to stop for a little. car idles like crap too.

could it be the gasket? not creating a seal?

 

Sounds like you have a leak between your intake manifold and head, or maybe your injectors aren't sitting in the fuel rail correctly.

grab a can of Brakeleen and spray it generously where the IM connects to the engine. if your car revs up a bit when you do this, you have a leak. make sure your torqued all the bolts down, and the gasket is sitting in there correctly.

 

yes make sure u check that fuel rail for sure.. i had a similar problem with one of my injectors... in anycase, reset your piggyback and relearn.. take it easy for a hundred miles and idle should be fine.

 

did you tighten the intake manifold bolts starting from the middle and alternating out?

 

ok thanks to everyone for the advice

just bought some sealant, i just need to wait till fri to get the missing bolt from the TB

 

^^^ "missing bolt"??? problem solved???

 

lol, nah that happened from when i put the stock manifold back in
i had two, one i ported myself and the stock one

Wait fuel injectors? How can they sit wrong in the fuel rail?

 

if you did a bad port job that could also cause it to idle bad.