Medic/Z28

iTrader: (9)

My car has this noise that lately has been getting more and more on my nerves than usual. It's sort of a hissing maybe ticking noise. It's mainly heard when I'm at 2400 or higher on the RPMs at any gear. Would a vacuum cause this? Valve train has been checked. Rockers checked and tightened to 22 ft lbs. Everything in the heads looked great. Would a vacuum leak cause bad idling. I think it idles like **** cause its humid but who knows. New plugs, wires were good. All maintaince has been done. If anyone could shine some light on my annoying issue I would be really appreciate it. Thanks guys

LS6427

iTrader: (2)

Vacuum leaks directly effect your idle quality.

LS6427

iTrader: (2)

Check all hoses and check for cracks in the intake or any plastic fitting for those hoses.

Also, a loose hose for the TB or bellows letting unmetered air in downstream of the MAF can mess with the idle quality.

Medic/Z28

iTrader: (9)

In the back of the LS1 intake I remember a hose on my old intake had a closed elbow or "T" if you will and on the LS6 intake I bought it had that piece open. Could that leak be causing this issue? Anyone one know what Im talking about?

LS6427

iTrader: (2)

Thats what I have, you need to plug that hole.

Medic/Z28

iTrader: (9)

Sweet I'll try that. You think I could reach it with out pulling the intake?

LS6427

iTrader: (2)

Depends on if someone spliced a new hose in. I can reach back there and lift mine upward and see the whole T fitting and the plug.