1991 Toyota 4x4 22re .On cold start the idle starts at 1700 rpms and slowly rises to about 2500rpms.It slowly comes down as motor warms up. It doesn't matter what temperture it is outside, summer or winter .
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Check for vacuum leaks. On a vehicle without a mas air flow sensor a vacuum leak will raise the idle.
check to see if there is a specific cylinder causing the misfire. Remove spark plug wires one at a time or unplug injectors one at a time. If the engine rpm changes that cylinder is working. If there're is no change than that cylinder is not working.
If there is a specific cylinder that is not working than you can check for spark, compression, and fuel on that cylinder.
Hi Joseph, When starting the vehicle from cold in cold weather, the RPM can be as high as 1300 and in temperate climates about 1100 RPM. The RPM will drop to normal as the coolant is warmed. Normal idle speed is between 750 for Auto and 650 to 700 for manual transmission. Regards John
Hi Malcolm, The cold start operation on all vehicles increases and enriches the fuel to air ratio, making it easier for the engine to start. Most systems also incorporate an 'up idle' which runs the engine at a faster speed until the temperature begins to rise. Regards John
Have you tested the IAC (idle air control) sounds like it's sticking, I have tried to clean them but it was short lived, so once you have determine it's bad (after market $85) I would replace it and solve the problem.
You need to get your engine coolant thermistor checked and tested.
This is what tells the ECM when the engine temperature is at normal working temperature and turns the idle down.
But when the idle won't come down from cold to warm this is usually the main fault.
Hope this helps.