76 280z EFI/ High Idle - Please Help...

[kcdc]

Hi,

I have a high idle prblem on a 1976 280Z EFI.

I can screw down the idle screw to about 3/4 of one turn out from closed and it's idling around 1k. Even there if I give it a little gas, it hangs at an higher idle. If the idle screw is 6 turns out from the closed postion (as the FSM suggest), the idle is 2k and hangs a bit on acceleration.

The FSM states that "if less than six rotations are required,the throttle valve is opened excessivley or working parts are faulty". What could make that happen & would that cause high idle?

I have cleaned the springs at the accelerator linkage, checked the throttle valve switch and checked all my vacum connections with no fix. If I just nudge the linkage back closed slightly, it idle's OK. That makes me think the linkage is sticking, but I gues part of the EFI System could be telling the linkage not to close fully.

Any help is greatly appreciated. SBalke01, you out there???

Thanks in advance...

KCDC

Keith

[webdawg1]

Do you have the EFI Bible? If not you can get it at the following url:

http://www.72hours.net/~zcar/

High idle checks start on page 38 and should point you in the right direction...you say that you have the FSM, so you should be in pretty good shape...

webdawg1

[kcdc]

Thanks for the link.

Although I do have a FSM I'm new at this and know there are others with years of expereince out there, so any help with the problem would be appreciated.

Do you have the EFI Bible? If not you can get it at the following url:

http://www.72hours.net/~zcar/

High idle checks start on page 38 and should point you in the right direction...you say that you have the FSM, so you should be in pretty good shape...

webdawg1

[TomoHawk]

LISTEN...

Check every place where you could have a vacuum leak, like the cold-start valve, throttle bypass, etc. You might be able to hear the hissing from the vacuum leak. A small leak can add 300-400 RPM to the idle. Maybe even check the bolts on those to make surethey're tight.

[kcdc]

LISTEN...

Check every place where you could have a vacuum leak, like the cold-start valve, throttle bypass, etc. You might be able to hear the hissing from the vacuum leak. A small leak can add 300-400 RPM to the idle. Maybe even check the bolts on those to make surethey're tight.

Thanks TomoHawk. I gave that a try and no luck.