Hi Eric,
Check your pistons to make sure they make they move together at the same
rate both up and down. Also make sure they hit with that metallic "clink" at
the bottom. I found my front carb had a needle that would stick when the car
was hot, causing high steady idle at about 1000 rpm.
Good luck!!
Eric
> Hi,
>
> I've been having this somewhat annoying problem of a sticky high idle with
> my '69 1600. (By the way, I've really been enjoying both driving this car
> and learning about how it works and fixing the occaisional hiccup. Also,
> driving the car, what a blast!) These are the details:
>
> When I turn the engine on the car idles fine. When I increase engine
> speed and then slowly release the throttle the engine will slow down but
> then stick at 2k to 3k rpm. If I snap the throttle (i.e. release it very
> quickly) this doesn't happen.
>
> To try and fix this I took apart and cleaned the linkage. This done I
> reinstalled the linkage but left the two carbs decoupled (and unhooked
> from the throttle cable). The problem still happened with each carb
> individually. The throttle shaft would stop it's rotation a few degrees
> short of the idle stop and would just sit there. I was able to rotate it
> all the way to the idle stop by hand without very much effort
> though. With the engine off (but still warm) this problem didn't exist,
> the shafts rotate freely.
>
> I suspected that this might be related to a leaking throttle shaft so I
> sprayed around the shafts with carb cleaner and observed no dip in the
> idle so I don't think that's what's happening. However, there is about .5
> mm or less in side to side play of each throttle shaft.
>
> While I had the linkage off of the front carb I thought that I'd try
> turning the car on and rotating the throttle shaft by hand (it rotated
> very smoothly and freely with the engine off). When I did this it
> immediately sucked all the way closed and was very difficult to rotate
> open. When it did it popped all the way to full open and was hard to
> close. The engine roared, this worried me, so I closed the throttle and
> turned off the car. I don't know if this is normal behavior or not.
>
> When I searched the archives it seemed that other people had had these
> problems but no one knew what to make of it. So, has anyone figured it
> out? Does this sound familiar to anyone? Any suggestions? What do I do?
>
> Sincerely,
> Eric Corwin
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