LT1-LT4 Modifications 1993-97 Gen II Small Block V8

There's like this whining/sucking/vacuum noise coming from under the hood.

Thread Tools
 
Search this Thread
 
Old 05-26-2007, 03:10 PM
  #1  
TECH Addict
Thread Starter
iTrader: (12)
 
Shackleford's Avatar
 
Join Date: Sep 2004
Location: Houston, Texas
Posts: 2,693
Likes: 0
Received 0 Likes on 0 Posts

Default There's like this whining/sucking/vacuum noise coming from under the hood.

What is it? It hasn't always been there.
Old 05-26-2007, 03:23 PM
  #2  
TECH Senior Member
iTrader: (3)
 
Formula350's Avatar
 
Join Date: Oct 2006
Location: Decatur, TN (N-W of Athens)
Posts: 7,564
Likes: 0
Received 3 Likes on 3 Posts
Default

Its a Chevrolet SBC Gen II LT1 V8.
Old 05-26-2007, 03:26 PM
  #3  
TECH Addict
Thread Starter
iTrader: (12)
 
Shackleford's Avatar
 
Join Date: Sep 2004
Location: Houston, Texas
Posts: 2,693
Likes: 0
Received 0 Likes on 0 Posts

Default

Originally Posted by Formula350
Its a Chevrolet SBC Gen II LT1 V8.
You didn't answer anything.
Old 05-26-2007, 03:39 PM
  #4  
TECH Senior Member
iTrader: (3)
 
Formula350's Avatar
 
Join Date: Oct 2006
Location: Decatur, TN (N-W of Athens)
Posts: 7,564
Likes: 0
Received 3 Likes on 3 Posts
Default

Yes I did, I told you what was making that noise under the hood. Its your engine. You have a CAI and a free flowing exhaust, so it's able to breathe easily, which is what you're probably hearing lol

I don't know what else you want from us with such a vague description.

"Hi, I'm having problems with my car, it goes clunk..."
Old 05-26-2007, 03:41 PM
  #5  
TECH Addict
Thread Starter
iTrader: (12)
 
Shackleford's Avatar
 
Join Date: Sep 2004
Location: Houston, Texas
Posts: 2,693
Likes: 0
Received 0 Likes on 0 Posts

Default

Originally Posted by Formula350
Yes I did, I told you what was making that noise under the hood. Its your engine. You have a CAI and a free flowing exhaust, so it's able to breathe easily, which is what you're probably hearing lol

I don't know what else you want from us with such a vague description.

"Hi, I'm having problems with my car, it goes clunk..."
Did you not read the third sentence in my post? THE NOISE HAS NEVER BEEN THERE BEFORE.
Old 05-26-2007, 03:47 PM
  #6  
TECH Senior Member
iTrader: (3)
 
Formula350's Avatar
 
Join Date: Oct 2006
Location: Decatur, TN (N-W of Athens)
Posts: 7,564
Likes: 0
Received 3 Likes on 3 Posts
Default

I read it as "it has always been there". I read bad grammar all day long, you'd think I'd be used to it by now

Does the car run like ***? If yes: Vacuum leak. Do you have brakes? If no: Brake Booster vacuum line. If Yes: has your air filter fallen off the end of your CAI, or the boot connecting to the TB sucked up? The factory elbow is a POS where it connects to the TB.
Old 05-26-2007, 10:45 PM
  #7  
Teching In
iTrader: (1)
 
PrometheusX's Avatar
 
Join Date: Aug 2005
Posts: 17
Likes: 0
Received 0 Likes on 0 Posts
Default

Where does the sound come from ?

I had a rubber elbow connected to the pcv valve that deteriorated with age and then acted as a vacuum leak (obviously because it was).
Old 05-26-2007, 10:46 PM
  #8  
TECH Addict
Thread Starter
iTrader: (12)
 
Shackleford's Avatar
 
Join Date: Sep 2004
Location: Houston, Texas
Posts: 2,693
Likes: 0
Received 0 Likes on 0 Posts

Default

Ugh. It was the stupid K&N filter. It fell off the end of the CAI.
Old 05-26-2007, 10:48 PM
  #9  
TECH Senior Member
iTrader: (3)
 
Formula350's Avatar
 
Join Date: Oct 2006
Location: Decatur, TN (N-W of Athens)
Posts: 7,564
Likes: 0
Received 3 Likes on 3 Posts
Default

lol YAY! I did something right today!
Old 05-26-2007, 10:51 PM
  #10  
11 Second Club
iTrader: (88)
 
the_merv's Avatar
 
Join Date: Mar 2006
Location: The Beach...
Posts: 19,260
Received 58 Likes on 51 Posts

Default

When I converted to the LS1 Lid in mine.. it sounded like a Vacuum when I started it first thing in the morning..
Once you start flowing air real good the sound nice.
Old 05-27-2007, 12:00 AM
  #11  
TECH Resident
 
01Z28M6's Avatar
 
Join Date: Oct 2005
Location: Taxme, Ohio
Posts: 781
Likes: 0
Received 0 Likes on 0 Posts

Default

Originally Posted by Formula350
lol YAY! I did something right today!
Man, I like your style.
Old 05-27-2007, 12:01 AM
  #12  
TECH Addict
Thread Starter
iTrader: (12)
 
Shackleford's Avatar
 
Join Date: Sep 2004
Location: Houston, Texas
Posts: 2,693
Likes: 0
Received 0 Likes on 0 Posts

Default

Motley Crew.
Old 05-27-2007, 12:08 AM
  #13  
TECH Fanatic
iTrader: (1)
 
Captainofiron's Avatar
 
Join Date: Apr 2006
Location: New Mexico
Posts: 1,687
Likes: 0
Received 0 Likes on 0 Posts
Default

when I put the smooth bellows on my Ram Air it started sounding like a vacuum leak
Old 06-08-2007, 11:31 AM
  #14  
TECH Addict
Thread Starter
iTrader: (12)
 
Shackleford's Avatar
 
Join Date: Sep 2004
Location: Houston, Texas
Posts: 2,693
Likes: 0
Received 0 Likes on 0 Posts

Default

Ok. Well, it did stop the LOUD vacuum noise, but there's still some vacuum noise there.
Old 07-01-2007, 01:20 PM
  #15  
11 Second Club
iTrader: (7)
 
moserman's Avatar
 
Join Date: Sep 2006
Location: Lancaster, PA
Posts: 319
Likes: 0
Received 0 Likes on 0 Posts
Default

throttle body, mine whistled like a beeeeotch and when i changed over to 58mm it stopped, just a possible suggestion
Old 07-01-2007, 03:17 PM
  #16  
11 Second Club
iTrader: (88)
 
the_merv's Avatar
 
Join Date: Mar 2006
Location: The Beach...
Posts: 19,260
Received 58 Likes on 51 Posts

Default

I got a 90mm goin on mine..it's goin to be loud as hell..
Old 07-01-2007, 03:23 PM
  #17  
11 Second Club
iTrader: (24)
 
fast's Avatar
 
Join Date: Jan 2003
Location: Champaign, IL
Posts: 626
Likes: 0
Received 0 Likes on 0 Posts

Default

whining and sucking sounds like you have a mustang owner living in your car
Old 07-01-2007, 03:41 PM
  #18  
11 Second Club
iTrader: (88)
 
the_merv's Avatar
 
Join Date: Mar 2006
Location: The Beach...
Posts: 19,260
Received 58 Likes on 51 Posts

Default

^^ No, I just call them loosing...
Old 07-01-2007, 05:19 PM
  #19  
TECH Senior Member
iTrader: (3)
 
Formula350's Avatar
 
Join Date: Oct 2006
Location: Decatur, TN (N-W of Athens)
Posts: 7,564
Likes: 0
Received 3 Likes on 3 Posts
Default

Merv. 116mm > 90mm
Old 07-01-2007, 06:26 PM
  #20  
11 Second Club
iTrader: (88)
 
the_merv's Avatar
 
Join Date: Mar 2006
Location: The Beach...
Posts: 19,260
Received 58 Likes on 51 Posts

Default

That's not how it works..if you are referring to the twin 58mm. That 90mm might out-flow the LT1 58mm TB believe it or not... Not by much, but just a little bit..

Last edited by the_merv; 07-01-2007 at 06:58 PM.


Quick Reply: There's like this whining/sucking/vacuum noise coming from under the hood.



All times are GMT -5. The time now is 04:07 AM.