Cant get idle speed to come down

Vehicles tend to idle higher for two main reasons, as the temperature becomes colder, the engine must work harder to warm itself up so it idles higher to accomplish this faster. The second may be due to a vacuum leak in the engine. Any other symptoms?

check the fan belts, they are manually tightened on the rodeos.

A defective idle speed control valve or one that is clogged with blow back sludge, try cleaning as th enew one is about $300.00

To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.

Un- screw the eight phillips head screws to romove it.

It's normal for the a/c system to increase idle speed when the compressor is running and then lower it again when it's not.

you need a blower motor resistor or te wiring may be melted that goes to the resistor

Most likely is your idle speed timing, there is either an adjusting screw, or you need the dealership to place a diagnostic tool on there threw the computer to set it down some.

.... any auto repair shop should repair it for you. not much money though. maybe just the motor to be replaced.

I have a 1996 holden rodeo 2.6 petrol, it misses badly on accelleration, I have replaced plugs, leads, distributor cap, and run injector cleaner through... it idles ok,,,,

Good Day
Vale clearance cold
intake .006 in (.15 mm)
exhaust .010 in (.25 mm)

Timing
1. With transmission in Neutral or park, start engine and warm to normal operating temp. turn eng,and all accessories off. connect Tachometer. Connect timing light to no 1 spark plug wire.

2. Disconnect and plug fuel vapor canister purge hose and EGR vacuum hose. Start and ensure idle is 900 RPM. adjust idle as required. Check ignition timing ( 12 @ 900)

3. If adjustment is required, loosen distributor hold down bolt and turn until timing is within specification. Tighten distributor hold down bolt and recheck timing. adjust idle speed as required.

hope this helps

Cheers