High Idle

[Daniel_Mc]

Originally Posted by Pete

Sounds like you have a big vacuum leak.

Originally Posted by Pete

By the way how did you plug the holes when you took off the secondaries.

I had a freeze plug fell off on one of the secondary holes.

Did you plug the vacuum port under the plenum that went to the EVAP solonoid?

When you ported the TB are the throttle blades closed?
Just in case i doubt it but try stock chip.
Pete

Pete,
I couldn't find a vacuum leak this was my first thought I will pull the plenum and check. The Dorman plugs were used to cap the secondaries and I don't see them coming out but will also look at that. The port under has been capped. The TB was done by the PO all I did was refinish it and reinstall. Everything operates smoothly without any binding. I don't have a stock chip but I will pull the one off of my Z and see how that works or if it changes anything.

It maybe tiime for a data logger. Need to find out if it's getting
into closed loop. The fact that it's going backward over
time is curious. (going higher rather than lower)
See what happens when you unplug the IAC.
Also pull the bellows and watch all three plates
for movement as the idle increases.
Getting any codes set?

Scott,
No codes are being thrown. I will try the IAC tonight and see what that gets me.

I agree with Pete. The symptoms you describe sound like a vacuum leak. I have had it happen to me. Did you put o-rings on all 16 injectors at the injector housing. Some year LT5's require an oring that is in the housing.

Try removing the bellows at the throttle body air horn and block the air flow to the throttle with a STIFF board, a binder cover works well. With the air horn blocked, the engine should stall. If the engine doesn't stall, you have a vacuum leak.

Good luck

Jim

Yes, new O rings in the IH's (where needed) and on the injectors form FIC (where needed) had the O rings already installed so it is all new. Thank you for the tip I will give it a shot.

Since you ported TB, have you done the Min Air adjustment?

We did not port the TB just refinished it when Tommy Morrison had the car the TB was done this was in the late 90's.

Thanks for all the advice guys we will see where this takes us.

Daniel