How can I lower the idle speed on a 3.3Litre 1994 Dodge Intrepid? A new idle speed motor was installed and now the engine idles at 1500 RPM.

There are 2 idle specs. One is in gear with brake applied. What is that speed?

Camshaft sensor bad

Check your I A C motor (idle air control motor) Check all your hoses and tubes leading to and from. Check the throttle linkage itself to make sure nothing is obstructing it from returning to normal rpm,

check the EGR valve under intake it is probly stoped up fixed mine last year was iseling at 1500 rpm till i changed lower EGR valve and cleaned out intake of carbon buildup

Your idle speed may be too low. It is common for the Alternator to slow down with the engine RPM. You can get a free scan of your charging system at Autozone or Oreillys. You may have a lazy Regulator which is not allowing more power through.

Some cars like Ford products have a sensor which automatically increase idle speed to keep the Voltage up. In your brand you need to ask a Dealer. When your car has more equipment demanding power than the Alternator produces, the Voltage will drop.

You may want to install a new Serpetine belt and check your Tension pulley for a tight fit. If the belt is sloppy it can effect the charging system.

EGR valve, Idle speed controller

intake gaskets

you have abad idol sensor

its your idle control valve

near the throttle body part there is a electronic idle control valve either this control valve is defect or there is a leak between the body and the valve.

regards Sam (holland Europe)