A bit of emergency help please!

[Joshu]

Its 1:51 AM so ill get right to it

Both head gaskets were blown bad. We did em and it runs good with two major exceptions. 1) The car is idling at 1500. 2) No heat. My coolant system is so sludged up. We got tired so we're gonna flush it at for a 3rd time tomorrow morning.

SO: I am assuming something has gone wrong with the heater core (blockage?)

But really puzzling me is the 1500 rpm idle. The Idle air sensor is fine.

Any bits of wisdom you guys could offer?

Thanks - Josh

[Joe 1320]

The IAC (idle air control) valve is responsible for metering additional air into the TB when the blade is closed. I would look there.

[Injuneer]

If you can get a scanner on it, look at the IAC counts. If they are bottomed out at zero, and its still idleing at 1,500rpm it means its getting air from some other source, or the IAC motor (its not a "sensor") is not seated correctly, or not working properly (how do you know it is "fine"?).

Are you sure the throttle blades are closing all the way? Possible there's a gasket leak at the intake manifold or behind the throttle body? Possible an injector or two is missing the bottom O-ring? Any vacuum hoses not connected, or cracked?

[Joshu]

We took off the IAC and blocked the air off completely using a finger and it was still at 1500. Moving the finger in and out the RPM's responded accordingly.

[Mark B]

Sounds like a vacum leak. Start following hoses. A big one that is sometimes forgotten is the vacum line runing to the power brake booster.