loud air noise in the back of my engine bay

[gsxvince]

so i just swaped a sixbolt into my car and now it sounds like it is shooting air out of the driverside rear part of the enigine
what could cause this???

 

[gusu]

Probably just a bad vac leak.

 

[gsxvince]

what is even back there to make it though??
ive looked and all the hoses are in place

 

[bomper04]

The vacuum source for the brake booster is behind the IM, it's a threaded hole..Is the car having a hard time running?

 

[gsxvince]

eh it has an idel surge, check engine light is on and it doesnt start too well..

oh and the boost is higher then it should be

 

[rlacasse1]

Is the vacuum line for your brake booster good to go? That is the only thing I can think of back there.

And a massive leak would cause your car to be hard to start and run like crap once it did.

So it make sense.

 

[bomper04]

Okay, but as far as the noise that you're describing is concerned: Have you looked near the back of the intake? That's what I could imagine would be the source of the "air" noise you're hearing near the driver's side. Other than that, make sure the line for the PCV is connected..and there's also one more line running from the actual IM, two in the front, one in the rear. Then of course you have the ones on top of the throttle body..but that's closer to the passenger side.

 

[gsxvince]

yeah i could see it being that um would that cause it to make the air shoot out as different pistons are firing??


and i know the breaks arent working too well but i thought that might be because i havent put my new ebreak cables in yet

 

[datbmac]

Your vacuum brake booster is leaking, that more than likely is the cause of poor braking and the vacuum leak as well.

 

[gsxvince]

k thanks ill see if thats the case and get back to this

 

[bomper04]

Air is shooting out? That's not physically possible with your vehicle at idle , though you may have the noise confused. A vacuum leak of different sizes can sound like air is being forced out when it really is just in a vacuum to different people. If you feel that your brakes require a heavier effort than normal than it more than likely is the brake booster line/fitting. Here's a way for you to determine whether or not your booster is working properly: let the car run for a minute or so, stop the engine, go in and depress the brake pedal several times, pedal effort should increase and the pedal travel should decrease. If it doesn't do that, either A: your brake booster is no good, or B: the vacuum source for the brake booster is not there (unplugged, cracked or damaged line.)

 

[gsxvince]

sweet thanks

 

[4g63monstr]

As dumb as it sounds, it could also be the wrong intake manifold gasket. My gasket kit came with a intake gasket for a 6 bolt when I was assembling my 7 bolt... I didnt notice until I fired the car up that it had a HUGE leak there.

 

[bomper04]

Was that it?

 

[gsxvince]

the gasket thing might actually be it i have a 7bolt head and a sixbolt block so my dad might have got the wrong gaskets for the intake and what not

 

[rlacasse1]

Do you have a 7 bolt intake manifold? If you do then that is the gasket you need.

7 bolt head + 7 bolt intake manifold = 7 bolt intake gasket.

It is not your pistons shooting air out.

 

[gsxvince]

yeah i have a full 7-bolt head but idk if i got the right gaskets for it ### my dad picked them up so ill get a new set and redo them and check my vacuum booster aswell

 

[rlacasse1]

What the hell is a vacuum booster?

This is simple.

Go out to your car and look at it. Check and see if the big ####ing hose coming out of your brake booster is attached to the intake manifold. If it isn't then you will have a big ass leak.

 

[gsxvince]

haha so its all because my timing jumped a tooth
somehow...
i really hope my head didnt get messed up