Re: Carter 2bbl Throttle Plate Position
 

Dead canister is my main guess.

Mix screws really messed up is my second. (you only have one 'curb
idle' speed screw on the throttle linkage and one on the fast idle cam
not 'idle screws' like you mention) Did you set the mix screws down
front back 'exactly' where they were before the carb kit job?

Choke partially closed is my third.

The speed screw should be turned in a fair bit past closed throttle to
have a stable idle. All the way off means something is wrong.

If the plate is closed, it has some leakage that can be forced more
closed by hand turning the throttle hard which will drop the idle.

When the screw is backed off, the plate should be closed and the engine
should die.

I would first trace the PCV line to the back of the carb. There you
will find a T fitting or a solenoid unit. Trace the other line down to
the canister.

At idle pinch this line closed. If the idle changes, you have found the
trouble, the canister purge valve is shot 'or' you have the plumbing
wrong for the purge valve.

It only turns on via a ported vacuum signal and the CTO valve, so it
should only suck into the PCV when hot and at speed.

If that is ok, give me feedback on the other screws and I can likely
point you the right way.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Dave Hilbert wrote:
>
> Hi all,
>
> Thanks for the help on my problem. I still don't know the answer,
> but...
>
> 1. I'm pretty sure there is no vacuum leak in any hose (or in the
> charchoal cannister). Used half a can of carb cleaner to check the
> hoses and the intake manifold gasket.
>
> 2. The idle screws are out of the way, as is the fast idle cam.
>
> 3. I already rebuilt the carb, but I never touched anything around
> the throttle plates. The kit didn't have any replacement parts for
> the throttle body.
>
> 4. The accelerator linkage doesn't seem to be stuck on anything.
>
> So, I guess I'm hoping someone could tell me just how the throttle
> plate seats in their carb at idle. Is there any "give" so that you
> can shut the plate further? On mine, I can still shut the plates with
> a little extra force, and the RPMs come down. Perhaps I have some
> bushing that's worn or something?
>
> Thanks,
>
> Dave (?)