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From: mer@uvacs.UUCP (Marc Rouleau)
Newsgroups: net.auto.tech
Subject: Re: still shaking when cold
Message-ID: <144@uvacs.UUCP>
Date: Thu, 6-Feb-86 12:16:19 EST
Article-I.D.: uvacs.144
Posted: Thu Feb  6 12:16:19 1986
Date-Received: Sun, 9-Feb-86 06:46:02 EST
References: <265@uwstat.UUCP> <197@xios.UUCP>
Reply-To: mer@uvacs.UUCP (Marc Rouleau)
Organization: U.Va. CS dept.  Charlottesville, VA
Lines: 29
Keywords: Toyota Tercel, choke, spark plugs
Summary: Could be the choke pull-off

In article <197@xios.UUCP> phil@xios.UUCP (Phil Trubey) writes:
>
>> I have
>> found that if I depress the gas pedal (when the car is
>> cold, i.e. left outside over night) the car will start
>> rough idling - it will start but after 10-15 seconds will
>> start to shake. The shaking lasts 1-3 minutes. At the end
>> of this period the idle speed shoots up. 
>

I had similar symptoms with my '78 Ford.  On my carburetor there is a vacuum 
hose plugged into a doohickey (the choke pull-off) which is mechanically
linked to the air intake regulation plate (the choke) at the top.  The vacuum
should cause the doohickey to pull on the linkage when the car is cold.
If no vacuum exists in the hose, or if the choke pull-off will not hold a
vacuum, your car will not start well.

If the hose doesn't deliver vacuum to the choke pull-off when the car is cold,
check that it is connected properly to a place that does deliver vacuum and
that it has no leaks of its own.

To check the choke pull-off, remove the vacuum hose, push in the part
which pulls on the linkage, and cover the hole left by removal of the hose.
If the pushed-in part does not stay in, the diaphragm in the choke pull-off
is bad, and you'll need to replace the entire part.  The part cost me only
twelve dollars.
-- 

              Marc Rouleau         uucp: decvax!mcnc!ncsu!uvacs!mer