Stalling after shifting, while slowing to idle in gear.

[robw_z at yahoo.com (Robbie Cotner)]

the JH engined CIS cars only have a WOT(wide open thottle) switch, no idle switch so that isn't the problem.  What does your car idle at when you start it cold?  what does it idle at when warm?  it sounds like a vacuum leak to me, probably around the intake boots.  Inspect the clamps, connections, and the ribbing, they are prone to crack inside where you can't see.  HTH,
 
-Rob

rhys <sik8v@netscape.net> wrote:
oh, i forgot to mention that the engine is a JH...does this still apply?

amalventano@sc.rr.com wrote:

>>Alright, this has gone on lone enough.
>>
>>The car ('84 rocco, 1.8 CIS) just dies after shifting. It used to be
>> 
>>
>
>reposted from my post from last september:
>
>---------------------------------------------
>
>The rieger does the same exact thing:
> our cars have an idle fuel cutout. if the throttle is at the idle
>position,
>it closes the switch on the throttle body. if the idle switch is closed and
>rpm
> 
>
>>~1600, this results in the jetronic box applying ~-50ma to the DPR until
>> 
>>
>rpm
>drops below ~1400 rpm. This lets the engine coast down with no fuel (as
>opposed
>to the fuel injection attempting to supply correct fuel during a coast).
> as a side note, there is a time delay. the ecu must see the idle switch
>closed for >1/4 second in order for it to start the idle kickdown process.
>
>the reason we get our stall is a combination of any of the following:
>
>- dirty idle contact, resulting in longer than 1/4 sec lag for ecu to see
>the
>switch closed (switch debouncing is accomplished by a r/c circuit in the
>jetronic box), resulting in the kickdown occuring right at 1400 rpm or
>slightly
>below, possibly resulting in a stall if you get it just right.
>- sluggish/clogged fuel system, resulting in a lag as the DPR attempts to
>get
>back to normal control pressure (<1400 rpm). if it cant get pressure back
>quick
>enough, you stall.
>- vacuum leaks (may not be enough to mess with idle, but can be enough to
>cause
>a stall in this kickdown condition).
>- tuning: the kickdown circuit recovers to the standard +5 to +10 ma DPR
>current
>range. if you adjusted/tweaked your DPR current out of this range, your
>fuel/air
>will be out of whack immediately following the kickdown. this may be enough
>to
>cause a stall.
>- idle speed set screw adjusted too low. if the ISV is already at near max
>open
>dwell during a normal idle, it cant open any further to correct for the
>downward
>swing during a kickdown, meaning its harder for the system to recover a low
>idle
>speed, and you stall.
>
> and finally, the reason the problem goes away when the a/c is on: idle
>kickdown is disabled with the a/c on to prevent compressor loading from
>stalling
>the engine during a kickdown event.
>
> I plan on messing with these things one at a time until i nail it, but i
>am
>fairly certain that its a combination of the above thats causing it right
>now. i
>have a feeling simply opening the idle speed set screw a bit will fix the
>problem.
>
>HTH
>Al
>
>
> 
>

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