1993 Toyota Celica Q&A  1993 Toyota Celica Question: How to
adjust idling  My 1993 toyota celica is only idling at 200 rpm
and when you ranit at mosy it reads about 300 rpm. - Answer 1
Sounds like your rpm gauge or tachometer may not be reading
correctly, your car would not run at 200, it would die, the
starter alone will spin it at about 350 rpm. - Answer 2 Dan is
right. If the engine idled that slow it would stall and cut out.
DO you mean it idles at 2000RPM that would be way too fast. If
the idle is too low look at the air boot from the air filter
housing to the manifold make sure it is in tact, (no rips) , and
no other vacuum leaks around the intake manifold, clean the
throttle butterfly by removing the air boot, open the butterfly
by hand and using an old tooth brush and Chemtool remove carbon
black deposits from the butterfly area. The 2.2L and 2.0L turbo
electronically adjust the idle speed, the 1.6 L you can adjust
the idle speed by turning the idle speed screw at the forward
top side of the manifold