How do I adjust the idle on my 1993 Mercury Capri? Its only idling at 500.

The Idle Air Control cleaning is probably the fix that is needed. also clean the Throttle Body and MAF.

https://www.google.com/search?q=1993+Mercury+Sable+3.8.+It+won%27t+idle+when+warm.

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kimberley, your car needs a tune up including sparks plug. When was the last tune up? Long time eh!

hi u may have a blocked fuel filter aslo check air filter if these ok check 4 vacuim leaks

My 93 s10 blazer idles really ruff and i
erratically for the first few minutes until it warms up. It now sound like its going to stall every morning I start it up and black soot comes out the tail pipe onto the pavement but only while its idling rough. After i changed the cap and rotor it idled good for a couple days then started doing it again.Already changed the fuel filter and pcv valve. whats the problem?

you cannot ,its idle control valve and its either faulty or the ECU needs reprogramming ,so i would return it to a dealer who has the correct software

Check your intake manifold gasket for leaks. You do this by running the engine and using a squirt bottle of water. Try to reuse an old windex or similar bottle that streams as well as sprays.

The idea is to have the engine inhale the water at the gasket seams. This will make the engine miss or stall and you will know where the leak is. The faster idle is due to the engine getting more air than the throttle opening is set for.

If you do not find any leaks at the intake manifold, use the spray setting and follow the vacuum lines to the components they are plugged into. Spray the components and vacuum lines to find cracked lines or cracked components that are venting vacuum.

If everything is sealed then go to Autozone or Oreillys and get a free scan on your car. They can tell you how fast your car is idling with a second gauge. Sometimes a throttle position sensor can be bad and cause this problem.

Is there a yellow check engine light on? Do you hear any vaccum leaks? Most causes are a faulty throttle position sensor AKA TP Sensor. But it also could be the idle control vavle is gummed up.

Would this be the 1108cc or 1372cc model Uno ? You will find the vacuum advance unit attached to the distributor. Check the pipe connection from the vacuum advance to the carburettor - loose or damaged. This is normally the main cause for uneven idling/stalling. Alternatively the carburettor needs adjustment via the carburettor idling screw. Hopefully this will help. Good luck.

near the throttle body there is an adjusting screw(flat head) for air fuel mixture, it's on a deep cavity sometimes with a cover, adjust counterclockwise will increase the idle.

If the car was running great and then all of a sudden it started this problem and you did not change the timing belt. Then I would say its not your timing belt. Once a timing belt is on its stays timed until it breaks, unless it looses a tooth on the belt and at that point it would run really ruff all the time or not at all. If it cranks well and idles with a small skip but when you add gas it get worse. I would look at your fuel injectors and spark plugs and wires. start simple and work towards the big stuff. most of the time its simple like plugs and wires or gummed up injectors. Run some good injector cleaner as well. Hope this helps