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Idle up down - Cars & Trucks

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Make model? fuel type? more detail please!

Posted on Oct 15, 2013


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1994 Honda Civic DX I Replaced Idle Air Control Valve Because Idle Was Jumping Up And Down The New Valve Jumps And Down To And when i Disconnect The Valve Car Idles Fine ?


Erratic Idle On Civic - YouTube

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Oct 27, 2011 - Okay so im learning lots about Honda's, i have rebuilt motors and put them but i cant ... It has a constant up and down idle between 1200 and 2000 rpms. ...to a near stall for a fraction of a second, then jumps back up, like clockwork. ... No coil packs on your 1994, of course - just one coil and a distributor. Rpm jumping up and down at warm up 1k to 2k 97 honda prelude ...
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Idle goes up and down! HELP! ' ClubCivic.com - Your Online Civic ...

www.clubcivic.com > ... > Engine Tech / Drivetrain

Jan 09, 2016 | Honda Cars & Trucks

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I hooked my 95 Mazda mil up and says I need O2 sensor for bank 1 and 2 and also says I need engine speed circuit not sure wat to replace and wats really messd up please help


First is all always write down the codes you have present, it helps in closing down on the problem. I am assuming you have a 95 Mazda Milleinia

1. Start and run the engine and monitor the oxygen sensor signals and see if this sensor has bad readings still. Check for an open or shorted wire between the sensor and the Engine Control Module (ECM) if the signal is dropping out.

2. Listen for an exhaust leak in the area of the oxygen sensor, the leak could allow oxygen in to the exhaust and skew the sensor readings.

3. Inspect the ECM and ECM connector for signs of something that has been spilled on the ECM. Is the engine idling too high or too low then check this:-
1. Unplug the idle air control valve and turn the air bypass screw in to see if it will idle down. If it will idle down, adjust the idle speed to around 500 RPM's and then plug the idle air control valve back in.

2. If it still idles high, remove the air boot from the throttle body, block the air bypass ports with duct tape, hook the air boot back on and start it. This should make it not idle at all or just barley idle. If it does, the problem is in the idle air control valve.

3. If blocking the air ports doesn't cause it to idle down, the throttle plate must be sticking open. Clean the throttle plate really good and back the throttle stop screw off and then see if it idles down.

4. Verify the coolant level is not low and that coolant is circulating through the idle air control valve. Tech Tips: This idle air control valve is two valves in one. It is a fast idle thermo valve on one side and a duty cycle idle air control valve on the other.

Mar 30, 2015 | 1995 Mazda Millenia

1 Answer

I have a 1990 S-15 with 4.3 motor idles high when you start, idles down , set and idle for a while it starts idling up and down.any idea's?


Could be a faulty idle air control valve.
The computer controls idle speed by regulating how much air enters the throttle body thru the valve.
You could unplug the valve when the idle speed is close to normal, then shut the engine off and restart to see if the idle speed is still in the same place. Unplugging the valve will also set a trouble code and turn the warning light on.

Mar 07, 2013 | Chevrolet Cars & Trucks

1 Answer

1990 2.4 toyota pick up idles up and down


can be the automatic idle check that its okay

Jan 31, 2013 | Toyota Cars & Trucks

1 Answer

1996 t bird 4.6l idles up and down


If it idles up and down real high, its the throttle body sensor. If it's a low up and down idle and runs rough it is mass air flow meter. If you unplug the mass airflow meter and it will just low idle (no up & down) then the mass air flow meter is bad.

Feb 11, 2011 | 1996 Ford Thunderbird LX

1 Answer

1990 Honda Accord Fast Idle Problem


usually idle that goes up and down is cause by a bad "idle control valve" located near the throttle body. Needs to be replace.

Oct 10, 2009 | 2005 Honda Accord

1 Answer

Idle problem: motor revs up and down at idle


it sounds like your idle control valve needs cleaning or replacing

Oct 08, 2009 | Honda CRX Cars & Trucks

2 Answers

High idle in park and nutreal


what is thye correct idle rpm in park 1999 amigo

May 02, 2009 | 1999 Isuzu Amigo

1 Answer

88 dodge dakota has rough idle and stalls at slow down.


Change/thoroughly clean the idle control solenoid. It may be sticking and causing rough idling.
Cleaning it is unlikely to be more than a short-term solution.

Jan 07, 2009 | 1988 Dodge Dakota

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