Poor Idle

[specialK]

I had the same issue after putting in my engine, turned out to be a bad vacuum leak at the power booster.

[douglas87]

So do all these older td's have ais problems?

[douglas87]

What is the adjustment screw by the ais motor on the throttle body for anyway?

[NAJ]

AIS failure is not uncommon and not anymore prevalent than it is on todays vehicles.
The majority of idle problems on TD's is related to vacuum leaks and carboned throttle plates.
The difference is that when looking at vehicles that are 20+ years old with OE parts the failure rate seems higher.
The screw is used to hold the throttle at its minimum opening(base idle) and all AIS movement by the controller is based on this being correct.

[douglas87]

Thanks for the help

[douglas87]

So is that screw the one you use to set base idle?

[NAJ]

Yes

[riley07]

even though there was not a code, the speed sensor tells the puter if your moving or not and will adjust idle accordingly too. specially if you go from throttle to closed throttle immediatly

[The Pope]

with the AIS unplugged set the idle to 950 RPM with the engine warm. Then plug in the ais. With the engine running you should run a can of carb cleaner down the TB and through the AIS. Consider plugging the bleed valve on the vac line to the map. These stick open and cause running issues like rich running and dying at stop signs.