Vaccume on LS6 intake
Thread Starter
TECH Apprentice
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Joined: Oct 2004
Posts: 317
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From: Paved road in OK
Vaccume on LS6 intake Is there any ports on the bottom of an LS6 intake that could be causing a leak. WHen I got car tuned I had a problem getting the car to idle, thinking maybe their was a leak somewhere, could not find anything, sprayed B12 around all of the intake runners where they meet the heads and had no change, is there anything that I could have overlooked on the bottom that could be leaking?
dunno what plugs he's talking about on the bottom, I just installed mine the other day. But you might wanna check the MAP sensor in the back. Is it a used intake??? Did you delete the EGR and air??? Did you change the seals if it is a used one??
Staging Lane
Joined: Nov 2001
Posts: 66
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From: Cedar Rapids,IA
Is this after a swap from and LS1 to LS6. If yes did you use the coolant tubes for the LS6 intake which eliminates the tube under the intake. The LS6 intake is deeper. If you didn't use the LS6 coolant tubes. The Ls6 intake will sit on top of the coolant tube going to the back of the heads. Some times this will hold the intake up causing sealing problems. You can modify the bottom of the intake to make it work with the LS1 coolant tubes with a little grinding. I've not done this but I hear that you can.
yea i had to grind down the bottom side of the intake till it was sealing good.. i couldn't get the coolant tubes in time so i did it the cheap way.. But i have always wondered if mine has a slight leak and thats why my times aren't so good at the track... But it seems like if i did have a leak and i rev it to 6600 on shifts i would definately hear it.. so i am not sure... just make sure you grind the bottom good or just replace the coolant lines.. my idle never smoothed out either though... but i had a bad tuner.. so i don't know haha! good luck
