'82 CE- Ide stuck on 3,000!

[beegdaddy]

I've yet to figure out what is causing this. Purchased @ 6 mos. ago and wanted to either run rich or shut off completely! Has been on carport under cover @ I went to drive it, and immediately after starting, idle jumped to 3,000! I am contemplating pulling crossfire system & installing Holley intake & carb. I want to see if this problem can be solved first. Couldn't find any cracked hoses, but did find a very small line had come loose, reattached but didn't make any difference. I did notice on the driver's side of unit, what looked like a piece of intake gasket torn & sticking out. could that be a factor? I know nothing @ these crossfire units other than they can be a PAIN! Any help?

 

[Vettehead Mikey]

Did you try seeing if the throttle is simply stuck? Return springs intact? Throttle cable pinched?

 

[82ColEd]

Pretty sure you looked, but just for the hell of it: Make sure the cable isnt getting stuck somewhere. Does the accelerator 'fall down' or does it simply jump to 3000 when it's warm ?
I can take a peek at my manuals to see if they got something on that.. (Shop Manual: Cant do without!)..
And i wouldnt rip it apart just yet. Mine has had it's issues, but once fixed, it runs nice.
Stefan


PS: You can always ask the 82CE guys over at http://www.82ceregistry.com/forum/index.php

 

[MrGibbly]

I'm not sure how similar a situation this is but I had an 87 Chevy Blazer with EFI and it would idle very high whenever the throttle body gasket leaked and it started breathing from the wrong places... More air, computer adds more fuel and suddenly you have higher rpm... I think it reads this as a lean condition and tries to compensate. Even if it isn't the throttle body gasket I'm betting you're getting extra air in the mixture and the computer is trying to "help".

 

[black_81_vette]

Yep that gasket you see is the problem replace the gasket under BOTH units

 

[wishuwerehere82]

Beegdaddy:

There are a few things that could cause this problem.

1) Vacuum leak at the throttle body gaskets.
2) Vacuum leak at the EGR diaphram or controller.
3) Vacuum leak at the air cleaner heat riser intake diaphram.
4) Vacuum leak at the intake manifold tub gasket.
5) IAC motor failure at the throttle body/bodies.
6) Idle stop screw on LH TBI turned up too high.

And Yes, they are a pain in the *$$ to debug and repair.
Usually, it is just one component malfunction, but sometimes several. Eh, 23 years is a long time for gismos to last. Some of the factory guys I have talked to that BUILT these at Rochester Products (now Delphi) say they had a lot of problems in the factory with these units, and they had to de-tune the Quadrajets that year just so the fuel injection units would be more attractive.

The June 2000 issue of Corvette Fever Magazine has a step by step article on tuning the Crossfire injection system.
Good luck finding the problem.