Rough idle with air on, dies when coming to a stop

[darrylecash]

I have a 97 Geo Metro, 1 liter, 5 speed, in the heat of the day
(upper 90's), the car runs smooth as silk with the a/c off, but it runs
rough and dies when I come to a stop or slow down in traffic with the
A/C on. I did adjust the screw on the TB linkage, and it helped (runs
great in mornings and late afternoons with A/C on) with the idle in the
afternoon and mornings while it is cool, but I still have the dying and
rough idle in the heat of the day. Can anyone please help with this
issue. This is my first Metro and I really like the car, if I can
just get past this problem.

I replaced the pvc, fuel filter, adjusted the idle linkage screw,
checked the fast idle solenoid, it was working, but I don't know if
it is working correctly, the solenoid plunger does idle up the engine
when it is cool, but may not be working correctly when it is hot. Thanks
in advance, Darryle

[crazyinkc]

There should be a valve on the fire wall just to the right of the aircleaner that has a white knob. It is an air by-pass valve the A/C uses to idle up the engine when the compressor kicks in.

[megawayne]

do you have a pic of where the hoses go to? I purchased the piece off of ebay and haynes manual is too generic to show the hose hookup. THanks.

[megawayne]

You have updated emissions, just like mine. You have the plunger setup on your tbi and you cannot use the knob setup. However, if you figure this out, by all means email me at [email protected]

[302Z28]

I have a '92 1.0L 5 speed. Twice in 255K miles, it has burned the #3 exhaust valve. On each occasion, this was the first signal that something was wrong. Each time, I tried adjusting the idle speed solenoid to compensate. Eventually, as the exhaust valve deteriorated, further adjustment of the solenoid was not possible and use of the A/C would kill the motor at idle or in stop and go driving. Even without running the A/C, use of the heater, lights and cooling fan would lug the motor to the point of rocking at an idle. It would appear that even one weak cylinder has a big impact on the low end torque and idle quality of these little powerplants. With one weak cylinder (175, 175, 65), mid range and top end seemed about normal. All of the telltale signs were in slow traffic or at idle. A quick compression test will verify if this condition exists. Good luck!
P.S.
Since replacing the exhaust valves and re-installing the head, all of the above listed issues have been resolved. The car has great low end power, gets 50+ MPG and will idle at 850 RPM with the A/C and cooling fan both operating at the same time. What a great little car! It stays warm in the winter, cool in the summer, has a radio that I can listen to and gets in excess of 50 MPG.