The Rodeo has a problem with a leaking heater core. Now that I got figure out the Rodeo has been idling after a short time at 4000 rpm. I step on the gas pedal and it revs up release the gas pedal and it stays 4000 rpm.
Seen as there has been a leak in the coolant system in the heater core it is possible that the coolant system has a air lock in it and a few things can resolve this. fill the coolant system to the correct level just with water until the problem is rectified. most vehicles have a air bleed screw. with the engine run up to normal temp and the pressure cap on bleed the air out of the coolant system by undoing the screw a few turns and releasing the air from the coolant system, if fitted with a bleed valve it will be some where on the higher part of the coolant system. if not fitted with one it can also be done by raising the front of the vehicle in the air by a trolley jack and using a coolant pressure tester on the coolant system , compressing the air and moving it along to the radiator . then when the compression tester is moved off the system top up the rad and reserve to the correct level and see if this helps . also it is possible that the thermostat may have been damaged and isn't working properly. check the throttle cable for being kinked , jammed or faulty return spring , also check full throttle travel at the butterfly and that it is returning to the closed position. next up would be clean the throttle body as well as the iac (idle control circuit) these get gummed up from time to time and can cause a issue as well. other possibles are a vaccume leak . hope this is of some help mate.
SOURCE: need instructions to replace 1994 Rodeo heater core
try autozone.com to see if they have your car listed for diagrams pictures and step by step instructions if your car is not listed then try your local library they have all the car manuals and even copy them for you
SOURCE: idle issues
I had the same problem and when I change the catalytic converter the problem was solve !
SOURCE: motor idling to high in my 1999 rodeo . changed
It sounds like it might be your throttle position sensor. Is your check engine lite on?
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