you can test it by unplug it to see if there's any change. The 1st week I got my van it idles OK but not great... then I discover ICU (behind the passenger tail light) was disconnected. I re-connect it and it idle worse, erratic... On Thu, Oct 16, 2014 at 9:44 AM, Stuart MacMillan <stuartmacm@gmail.com> wrote: > Just got my son's "new" '87, and we were told by the seller it had an idle > problem. He's driven it about 200 miles with nothing more than a bit of an > idle surge once in a while, but now it won't idle at all cold, and when it > warms up for a couple of minutes it races up to 3000 rpm and stays there. > Restarting doesn't help, and only when I unplug the idle control valve will > it stop (die). > > > > I've checked the TPS with an ohm meter and it works fine, and the idle > valve > hums. I can't find any vacuum leaks (propane torch probe), and it was > recently tuned up. So, is it possible for a bad Idle control unit to cause > this? It seems odd that an engine can run at 3000 with the throttle > closed! > > > > > The only way to test it is to replace it for $200. > > > > Thanks! > > > > Stuart > |
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