Question about 2000 Honda Civic

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I was driving my 2000 Honda Civic to work and all was well with it. However, as I started it up to drive home, the dreaded Check Engine light came on. I bought a new O2 sensor, and installed it, but the check engine light stayed on. I took the battery off, let it stay off for a minute, and then put it back on. I restarted the car, the light went away, I drove for an hour, and the light stayed off. However, I turned my car on this morning, and lo-and-behold the light came back on. In addition, my car has been shaking while it idles on occasion (the tach reads 500 and it shifts back up to 700 after a few seconds and then stops). After i replaced the O2 sensor, it stopped doing this (the tach stayed around 700-800). However, as soon as the light came back on, the shakes came back too...

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Start by waiting overnight (until the engine is stone cold), then remove the radiator cap and top off the radiator. Fill the reservoir to at least the
minimum line. Run the car until it's at Normal Operating Temperature, then add coolant ot the reservoir until it's at the max. line. Lastly, purge the cooling system of air.

Certain engine control components, including idle control, have coolant
passing through them. If there's an air pocket, they aren't being properly
cooled, and mis-idle problems like yours can occur.

Your owner's manual has this procedure. Alternatively, use the following:
1. Mix a solution of 50% ethylene glycol (designed for use in aluminum engines) and 50% distilled water. With the engine cold, remove the radiator cap and fill the radiator all the way to the filler mouth.

2. Loosen the cooling system bleed bolt to purge air from the system. (If you don't know what this is, ask.) When coolant flows out of the bleed port, close the bolt and refill the radiator with coolant up to the mouth.

3. To purge any air trapped in other parts of the cooling system, leave the radiator cap OFF, set the heater control (inside the passenger compartment) to Hot, start the engine, set it to fast idle and allow it to reach normal operating temperatures BY LETTING THE FAN COME ON TWICE. This will probably take at least 40 minutes, so have a magazine handy. Meanwhile, DO NOT tighten the radiator cap and leave the heater control in the Hot position.

When the engine reaches normal operating temperatures, top off the radiator and keep checking until the level stabilizes; then, refill the coolant reservoir to the Full mark and make sure that the radiator cap is properly tightened.

Also, check cleanliness of throttle body. Check cleanliness of IAC (Idle Air Control valve).

If IAC is sludged up, it will be unable to adjust the idle properly. For IAC location, Right behind the throttle body about where the throttle plate is. It sort of looks like a cylinder. It has two tiny coolant hoses connected to its underside, and one electrical connector.

You should pull off the air tube to the throttle body. This will expose the
throttle plate and the intake port for the IAC.

Very common, hope this helped.

Posted on May 04, 2010

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