CIS-E III problem, idle only no rev

[Huw Powell]

>    But now the '89 90Q don't wanna run right. On my way to work
> tonight, just crusing along, the motor lost all power like I ran out of
> gas. At first I thought the fuel pump which has been buzzing loudly for
> years finally died. So I pulled over, to find motor idling, FP buzzing
> as normal. Step on the gas and when the rpm's get to 1200 it cuts out.

I would venture to guess that your idle switch is bad, and shorted
constantly.  CIS kills the fuel above 1200-1500 or so rpms when the idle
switch is closed - since it means you took your foot off the gas.

>  The first one I check is the control pressure
> actuator, I unplug it, open the throttle and problem is gone, plug it
> back in and problem returns.

when you unplug the CPR, at warm idle, since its "rest" current is 0 mA,
nothing changes.  But now you have removed the computer's way of killing
the fuel.

Try unplugging the idle/wot switch connector and seeing if, other than
probably a high idle, it works properly.

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/