4afe engine car idles eratically. rev counter moves to 1000 revs them drops to 500 and car sometimes cuts out when revs drop

SOURCE: 1994 model toyota corolla - AE100

Don't think there's anything wrong with it. That's pretty normal for mine. If it's unusual behaviour for your car, check your coolant level. I almost ran mine dry last year and found in the days leading up to it that my idle revs were sitting around 2000 once the car heated up. If it turns out to be that I can give you some real handy tips for changing your coolant and flushing all the junk out. Much cheaper than a mechanic and good if you have a spare hour.

SOURCE: 1990 toyota pickup 22re rev problems

sound like a vacume leak get a can of carb cleaner . with the engine idling spray around the intake and base gaskets if the idle changes you found your leak cure the leak cure your problem

SOURCE: my 1987 turbo toyota supra

The throttle position sensor has an idle switch in it that tells the car's computer that the throttle is positioned at idle. If the idle switch sticks in the idle position, the computer will not allow the engine to rev more than 2500 rpm. In your case, I think the switch is stuck.

First, see if you can get the trouble codes to come up. Rig a jumper wire and jump between the "T" terminal and the "E1" terminal in the car's "Diagnostics" box. It is a small black box on the driver's side of the engine compartment near the battery. Open the lid and on the inside of the lid it has a map of the terminals.

Once you hook up the jumper wire, turn the ignition switch to on but do not start the car. If there are codes, the check engine light (orange) will blink the 2 digit code. It blinks the first digit, pauses, then blinks the second digit. The code for the throttle position sensor is code "41". That is, four blinks...pause...then one blink. If this code comes up, change the throttle position sensor. (If there are no codes, the check engine light will steadily blink once per second until you turn the key to off.) Don't forget to remove the jumper wire when you are finished.

Jun Magno

• 175 Answers
• Posted on Jun 06, 2009

SOURCE: car starts then cuts out

what engine is installed on your car? my initial impression is the ignition igniter module.

SOURCE: Toyota Camry revs up to 3kms when started

Sounds pretty normal to me.