Finding my vacuum leak...

[Billy Mild]

Check Valve: 14047619

[cvette98pacecar]

Originally Posted by Billy Mild

Could the check valve be backwards?

Your secondaries wouldnt open if it was backwards.

[Billy Mild]

Do I have the check valve in the right direction?

[Billy Mild]

Wrapping up my final plenum pull, I have fixed all the vacuum leaks. The check valve was my intermittent vacuum leak. When warm occasionally it would seal up otherwise it wouldn't. I cleaned the IAC, TB, and plenum. I tried to lubricate the TB plates and shaft with lithium grease. This didn't help the issue either.

I still have a hanging idle issue occasionally. If i stab the throttle idle goes back to normal every time.

Does that mean something is wrong with TB itself?

[Paul Workman]

Originally Posted by Billy Mild

Wrapping up my final plenum pull, I have fixed all the vacuum leaks. The check valve was my intermittent vacuum leak. When warm occasionally it would seal up otherwise it wouldn't. I cleaned the IAC, TB, and plenum. I tried to lubricate the TB plates and shaft with lithium grease. This didn't help the issue either.

There is some "DAG" compound in the TB bores that aids in sealing the main throttle plates. If you cleaned that out, you may well have the source of your high idle issue! Did you clean out the TB bores - most especially the location where the main tB plates rest against the TB at idle?

Originally Posted by Billy Mild

I still have a hanging idle issue occasionally. If i when the throttle idle goes back to normal. Does that mean something is wrong with TB itself?

Well... I dunno whatcha are trying ta "axe" here?

[Billy Mild]

Edited my last post. Thats what happens after a few adult beverages and auto correct...