Im now having trouble with the idle.. I had this problem with the old engine so i know its the carb.

Its a 1982 T/A with a CC-QJET

When its cold its fine.. around 600RPM in gear.. Once it heats up it can be anywhere from 1000-1500RPM..

I cant drive it like that its hard to keep the car from moving at a stop.


So ill try to counter act it and idle it down to 600 in gear once its hot.. but even then once im on the road it somehow is up there again.

Any ideas?

Thanks

 

Probably the most common cause for a high idle on a QJet is the choke not fully retracting even when the engine gets warmed up. The choke linkage has a "fast idle cam" in it that kicks up the idle speed any time the choke is on- the further the choke is closed the higher the idle speed. It should start high on a cold start (1200-1400) and then work down as you drive it over maybe 5 minutes at which point you should be down at normal idle speed of ~600-700.

If the choke isn't fully opening it'll hold onto that last step of the fast idle cam (might catch it sometimes, and not other times) and hold your idle up around 1000-1200.

TO TEST: With the engine warmed up and actively experiencing this "high idle" problem, take the air cleaner off (plug the vacuum line that goes to it so you don't have a leak). Look at the choke linkage that's between the round choke housing and the main body of the carb on the pass. side. You'll see in there a beefy looking "arm" with a kinda triangular shaped head on it. Push this arm down as far as it will go.

Does you idle immediately drop? If so, you have a problem with the choke not getting open- psot back and we can help you fix this if that's the case.

If it doesn't drop you have some other problem going on. Maybe a vacuum leak somewhere or something else.

 

I tried what you said. That triangular head was allready all the way down when I was having the problems.

Here are some pics taken of it while it was running

 

Another

 

Hi

Afew times recently when started the choke light stays on.. So im guessing my problems are all choke related.. How do I replace it?

 

choke light really means that your alternator is going bad or your belt is loose on the alternator. It's a long story, but that is what the choke light indicates.

Your choke thermostat (the black round disc that has the 3 screws and a gray electrical connector) looks like it is rotated clockwise too far. Maybe it is ok, but when the engine is cold and off and you pull the throttle back by hand does the choke close to butterfly on top of the carb completely.

 

Hi
Thanks for all the help I really need to get this fixed.

Phess: Im not exactly sure what you mean.

I need to pull the throttle all the way open when its off and cold but im not sure what you mean about the choke closing the butterfly.

 

If you still need some help, I have had some of your problems. My problem turned out to be multiple problems due to the car sitting so long. I had to replace the fuel pump. It was pumping fuel but the pressure wasn't riight due to an internal failure to the pump. I also had a bad electric choke. It wouldn't open all the way. Hopefully you haven't changed any settings on the carb from when it ran properly. There is a fast idle adjustment screw underneath the choke housing. If it ran right before, you shouldnt have to change this.
When you pull on the throttle when it is cold, that allows the fast idle cam to engage. This causes the flap on the intake to close all the way. If it doesn't close then there is a problem in the linkage probably due to the choke.
If the choke is bad it may not be fully opening the flap once the engine is warm. It was hard for me to tell this in mine.
Also check the fuel filter or replace it.
There is also a vacuum canister next to the choke that has a tang on it with an adjustment screw. When the engine is cold the choke causes the flap to close all the way. I can't explain how the linkage works but the vacuum canister helps to properly position the flap when the engine is cold. It should be set so that there is about a quarter inch opening at the back of the flap when the engine is cold. But the choke needs to be operating properly first.
Hope that helps.

 

Hi

Well I have a new fuel pump from when I installed my new motor afew months ago. Also the fuel filter isent to old.

I havent adjusted anything besides the idle on the drivers side.

phess11 said my choke thermostat looked like it was clockwise to far.. A friend at work said the same thing.. Is it suposed to be at that mark all the way to the right?

This all seemd like a choke issue.. I dont kow of whatever else it could be.. Where Do i get a new one.. Kragen And Autozone dont seem to have them on there web site.

 

I don't know why it is rotated like that. It may be as easy as unscrewing the 3 screws around the edge and rotating it correctly. Otherwise the thermostat is not functioning correctly and someone rotated it to get some kind of resonable result.

To adjust correctly, there is a little notch in the side next to the front of the car that lines up with a notch in the choke thermostat. Inside the choke thermostat assembly there is a pin (that is connected to the carb choke assembly) that fits inside a loop in the end of the thermostat coil. You'll see when you open it up. When the choke thermostat is cold the butterfly (metal flap at the top/front of the carb) should be closed. After running a few minutes the butterfly should be fully open.

If you need a new one I just got a new one for my care at Advance Auto store (partsamerica.com) for about $37. GM wanted $110.


Good luck,
phil