Since I have repaired my air leak in the lower intake, cold air intake passage with new rubber cover, my power is down from when it was leaking. Was thinking if I could adapt some type of valve that would open at wot I might get that power back. It ran really good when the old plug got sucked into the intake. My AIT was bad also, which added richness to compensate for the leanness. Has anyone ever tried this ? Any ideas ? This is with a trueleo intake. 3.4

quote Originally posted by Lilchief: It ran really good when the old plug got sucked into the intake.

Could you expand on that comment a little?

quote Originally posted by Gall757: Could you expand on that comment a little?

I think I can help with that. IIRC, he has a Trueleo intake and Buick GN throttle body on his 3.4 V6. (I have the same setup) The GN throttle body doesn't use an idle air tube, so the idle air tube fitting on the lower intake gets capped off. Apparently, that cap deteriorated and caused a big vacuum leak. Now that the vacuum leak is fixed, he feels that his engine has less power than before.

My advice would be to fix the remaining issues with the sensors, get a wideband O2 sensor on it, and go from there.

I used the L98 twin 40-something mm throttle body and it has an idle air passage built into the throttle body.
If something rubber-like got sucked into your intake, for all you know it could be keeping a valve open if the intake/head doesn't get hot enough to melt it.

I'd do a compression test.

After thinking about this some more I think it might be better to weld a bung on the intake neck and run another hose to the cold air intake passage. Blacktree you pretty well nailed it. It had more power at wot when the plug was gone.

Is your throttle body opening completely at WOT?

Last time I checked it was going all the way open. May check it again tomorrow