please help
when I shift thru gears and I have to press the clutch my RPM goes down only to 1500 RPM but when I just start the car idle speed is only 800 RPM
why isn't my RPM giong down when I press the clutch
you guys have any ideas?
can TPS be a possible cause?

 

It does take a littel time for an engine to spin down. The time between shifts may not be long enough. IF you just depress the clutch and hold it, the RPM should eventually drop to the specified target idle. Does it?

 

unfortunately, it does NOT. I can keep it running for as long as I want and RPM will stay as high as 1300-1500
I searched this site and I found sth about IAC valve causing problems with idle. Can it be so in my case?
I recently had my engine rebuilt, new sparks, cables, distributor, cap, I have 2 MAF sensors so I checked them both and still the same.
I'm desperate....

 

I took the IAC valve out and wanted to take it apart to clean it but I could not! the spring is out about an inch or two but it will not go any further, I was not able to push it back or pull it more out. Does this mean my IAC is ready to be replaced?
What is the operating range of an IAC? mine whem I connect it to the current moves about 1 millimeter and that's it.
I hope you guys understand what I'm trying to explain here

 

this is what I found about IAC:

now my question is: what do you guys mean by "You can gently rock the pintle back and forth and allow the spring to extend it until it comes apart in your hands" ??this was a quote of what Vader said. Is the pintle same as bar in IAC? I'm having some language problems here On th pic above there are: IAC unit, spring, gasket and this some sort of a bar. Do you refer to this bar as a pintle? I tried moving this bar from side to side but this does not cause coming this apart and spring in my IAC seems to be too weak to cause falling apart of an IAC
aaa help ?

 

The pintle is the stem with the tapered nose piece(in the upper right corner of the photo).

The pipntle does not simply pull out. The "threads" on the pintle are actually gear teeth that engage rack gears in the stepper motor body. There is a spring behind the pintle, so rocking the pintle back and forth while gently pulling or allowing the spring to push it will slowly work the pintle teeth out of the rack gears. After cleaning, drying, and applying a drop of clean engine oil or ATF, the pintle is inserted in the same manner - rocking side-to-side while gently pushing it back inward. Once the spring is completely compressed, you can safely reinstall the IAC without fear of bottoming the pintle nose in the valve seat and destroying the rack gears.

A sluggish IAC can do exaclty what you are describing, and it only takes the amount of dirt shown in the photo comparison to nearly "kill" the IAC operation.

 

thanks vader!
what I did to take it out was unscrewing IAC from TB, putting it into a plastic bag (IAC still have to be connected) then you connect A and B terminals in ALDL (as if you were reading the codes) and turn on the ignition (without starting a car)
IAC will come apart by itself! no problem with that!
after I cleaned everything and put it back it works fine!
thanx again guys

 

I have the same problem with my 84 TA. But it has a carb and obviously no IAC. It will stay at around 1500 when I push in on the clutch. But when I am stopped, i hold the brake and let the clutch out to where it drops down to about 900, and it will stay there. What could be causing this? I have no vacuum leaks and everything appears to be set up right.

 

Does the throttle linkage have a dashpot?

 

Nope, no dashpot

 

uh.. this is just a suggestion, but if your car isnt warmed up fully, mabey the choke is causeing the fast idle?

 

already checked all that. its weird cause you can drag the motor down with the clutch, and itll stay down.