this dern t44

[Huw Powell]

> '87 5kcstq, getting 1.4 bar, runs great--unless it's idling.
>
> Won't hold idle when cold, after 60 sec. or so and it's fine. Trying new ISV
> tomorrow morning, but also has cold idle problem

if it idles fine when warm, the ISV probably works

> (warm-up regulator?; coolant temp sensor?).

perhaps, either of those.  If it starts ok and drives ok cold, though,
the WUR is probably fine.

a bad coolant temp sender can make your cold idle troublesome.  could
also be a flaky idle switch.

> Now has new problem: when warm, come to stoplight, idle is now at 2000 rpm.

maybe that ISV is sticking after all...

> Re-start is a temporary fix.  So I'm also thinking idle screw coming loose?

Stop thinking and start checking... is the idle screw loose?  is it
sealed properly?

What does the coolant temp sender measure, cold and hot?

What condition are the electrical connections under the hood in?

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/