Question about Toyota Corolla

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The car is idling,one battery terminal is disconected,the idling goes up and down,its not as smooth as before almost to close off intermittantly.what could cause this type of idling.

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  • Toyota Master
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Do not remove the battery cable,this can blow the alternator,it is not like the old days,the car may have to relearn.

Posted on May 11, 2010

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Posted on Jan 02, 2017

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2 Answers

Rough idle problem


could be a vacuum leak at a hose or gasket. with the engine running spray a little carb spray at the intake manifold area. if the idle picks up you are close to the vacuum leak. dont spray on the exhaust manifold area, be careful

Oct 24, 2013 | Cars & Trucks

1 Answer

My car idles up the down; sounds like it wants to stall, but smooths out after a few minutes of warming up.


Its a faulty idle air control valve.You can take it off and clean it using a non-chlronated brake cleaner and a wire brush or and a scraperor you can replace it with a new one just make sure to reset the computer afterwards by disconnecting the ground cable on the battery for 30 seconds then start it.

Oct 18, 2012 | 1988 Buick LeSabre

1 Answer

A/c, wiper + intermittant (rear) recirc neons are


It sounds like the battery was not disconected long enough to fully reset the computer.
Loosen and remove the neg. battery terminal, wait about 20min and replace the terminal. Things should
return to normal. Hope this helps. Good luck

Jan 20, 2010 | Chrysler Voyager Cars & Trucks

1 Answer

My Hyundai Santa Fe 2004 doesn't shift down from overdrive when driving at 70 mph. Recently replaced the crankshaft sensor and timing belt. It is an automatic and the other gears seem to shift alright....


You might try testing the tps. It may have a dead spot at the high end of the throttle opening. Make sure the resistance continues to change as you open the throttle all the way.

Throttle Position Sensor

Operation The throttle position sensor is a rotating type variable resistor that rotates with the throttle body-s throttle shaft to sense the throttle valve angle. As the throttle shaft rotates, the throttle angle of the sensor changes and the ECM/PCM detects the throttle valve opening based on the TPS output voltage.
Removal & Installation
  1. Disconnect the negative battery cable.
  2. Disconnect the sensor connector.
  3. Remove the sensor retaining screws. Remove the sensor from its mounting.
To install:
  1. Installation is the reverse of the removal procedure.
Testing 2.4L Engine
  1. Disconnect the sensor connector.
  2. Measure the resistance between terminal 1 (sensor ground) and terminal 2 (sensor power).
  3. Specification should be 3.5-6.5 kohm.
  4. Connect and analog ohmmeter between terminal 1 (sensor ground) and terminal 3 (sensor output).
  5. Operate the throttle valve slowly from the idle position to the full open position, and check that the resistance changes smoothly in proportion with the throttle valve opening angle.
  6. If the resistance is out of specification, or fails to change smoothly, replace the sensor.
2.7L Engine
  1. Disconnect the sensor connector.
  2. Measure the resistance between terminal 2 (sensor ground) and terminal 1 (sensor power).
  3. Specification should be 3.5-6.5 kohm.
  4. Connect and analog ohmmeter between terminal 2 (sensor ground) and terminal 3 (sensor output).
  5. Operate the throttle valve slowly from the idle position to the full open position, and check that the resistance changes smoothly in proportion with the throttle valve opening angle.
  6. If the resistance is out of specification, or fails to change smoothly, replace the sensor.
  1. Disconnect the sensor connector.
  2. Measure the resistance between terminal 2 (sensor ground) and terminal 1 (sensor power).
  3. Specification should be 1.6-2.4 kohm.
  4. Connect and analog ohmmeter between terminal 2 (sensor ground) and terminal 3 (sensor output).
  5. Operate the throttle valve slowly from the idle position to the full open position, and check that the resistance changes smoothly in proportion with the throttle valve opening angle.
  6. If the resistance is out of specification, or fails to change smoothly, replace the sensor.
3.5L Engine
  1. Disconnect the sensor connector.
  2. Measure the resistance between terminal 3 (sensor ground) and terminal 1 (sensor power).
  3. Specification should be 3.5-6.5 kohm.
  4. Connect and analog ohmmeter between terminal 3 (sensor ground) and terminal 2 (sensor output).
  5. Operate the throttle valve slowly from the idle position to the full open position, and check that the resistance changes smoothly in proportion with the throttle valve opening angle.
  6. If the resistance is out of specification, or fails to change smoothly, replace the sensor.

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Sep 24, 2017 | 2004 Hyundai Santa Fe

2 Answers

How to switch out the battery


Remove Negative terminal first, then positive terminal. Battery will have some type of tie down or block at base with a bolt you will have to remove. Remember how it goes back together. Remove battery.
Install new battery and tie down or block. Install Positive terminal then Negative terminal.
Remember to never touch both Positive and negative terminals with a metal object (ie..ratchet, wrench etc) this can cause injury and/or permanent damage to a new battery.

Nov 27, 2009 | 1995 Eagle Vision

1 Answer

Electric problem on 2002 Jeep cherokee 6


I had a similar problem, Mine turned out to be a weak cell in the battery. Here is what I did to find it. First, check what postion is the dome light switch in when this problem happens?

Disconect the negitive battery terminal. connect a volt, ohm, amp, meter in series between the negative battery terminal, and the disconected negative battery cable. How much voltage is showing on the meter? open the door does the voltage go up, or does it drop off?
Close the door wait 30, 40 second voltage should start to decrease back down to 0. This is normal the dome light uses a module to control the dome light delay.
If the voltage does not drop down to zero with the door closed after a min. or 2, select the amp setting in your meter, read the amperage draw. This is what drains the battery, the higher the amperage reading the quicker the battery will drain.
With the meter still hooked up remove one fuse at a time, when the amperage drops off you have found the defective circuit.

Apr 15, 2009 | 2002 Jeep Grand Cherokee

1 Answer

Drain the battery


Disconnect the negative battery terminal, using a 12v test light put one end on the battery terminal put the other end on the cable if you have a draw the light will light up, go threw and disconect one fuse at a time until the light goes out, notice the fuse you pull out when the light goes out that the circuit that you have your short or draw in good luck

Mar 20, 2009 | 1996 BMW 318

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