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Re: toyota corolla model 1994 cc1600
Most likely, you have a very dirty throttle plate. Try this: Remove the tube coming from the air filter to the intake manifold. After it is off, look at the front of the intake manifold, there is a round metal flap, which is connected to the gas pedal via a cable. This is your throttle valve. Open it manually, & check to see if there is a lot of black "gunk" around it, and in the insides of the round hole where it closes to. If it is real dirty, the throttle valve will keep the RPMs up, because it is not closing all of the way; which may be your RPM fluctuation. Get some good carb cleaner from your local parts store & spray it real good until it is nice & shiny clean. Reconnect everything & start it up, please understand that the engine will smoke quite a bit, and then it will settle down, from the cleaner getting into the intake. This is a VERY common issue. I clean several of these a week.
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All the above is normal , except 2000rpm is a little high at idle . can be adjusted down to 1500rpm. the computer adjusts the engine speed . in drive the transmission loads up the engine idle drops to 1000rpm . in park engine unloaded rpm increase all normal.
To start with please do the following:
- Check the spark plug cord's resistance. (8 K Ohms- 25 K Ohms).
- Check spark plug gaps. (0.7 mm - 0.8 mm).
- Check reluctor to pick-up air gap. (0.30 - 0.40 mm).
- Check distributor cap for cracks or water accumulation inside.
- Check ignition timing. (10 - 12 degrees at idle speed).
- Adjust engine idle speed to 650 - 750 rpm.
- Check the valve timing.
The Toyota of your year is equipt with a map sensor,it is located on the firewall with a vacuum line leading directly to the intake manifold, This sensor measure engine load and adjust fuel accordingly.This is definetly the problem,make sure the vacuum hose did not come out,Look at the underhood emission sticker for it,it Toyota has a different name for it it might be called boost sensor or pressure sensor.
Idle speed (in PARK/NEUTRAL) should be set to approx. 700rpm (no further adjustment required).
The vehicle's ECU is programmed to adjust the rpm's after this - e.g. when you step on brake pedal, insert into gears or activate airconditioning, the vehicle's sensors send the data to the ECU, which then alters the rpm accordingly.
The normal idle speed is below 1,000 rpm...between 800 to 900 rpm. I suspect that the idle-air control motor has seized and can no longer automatically adjust the engine's idle speed. This part is also responsible for slightly increasing idle speed when the airconditioning is switched on to compensate for the added engine load. Some cars even have a "step-up" solenoid to increase idle.
When replacing the idle-air control motor, remember to clean the port that IAC motor goes into; there will be some carbon build-up that may prevent the part's cone-shaped valve from seating properly. A can of intake valve spray helped along with some Q-tips works well.
YOU NEED TO ADJUST IDLE SPEED TO 750 RPM FOR THE 2.4L ENGINE AND THE 3.0L ENGINE IDLE SPEED NEEDS TO BE 800 RPM.THAT IS THE REASON WHY TRUCK STALLING YOU NEED REALLY TUNE UP ENGINE THEN ADJUST IDLE SPEED.
Idle is factory set and cannot be adjusted, your best bet is checking for cracked hose pipework for air intake at idle,(not at problem under exceleration and driving) Any slight upset to the air /fuel ratio will be most prevelent at idle speeds.Check hoses where the meet metal flanges on manifold intakes and any sharp bends in ppipes.Good luck