Question about 1997 Honda Civic

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1997 honda civic 1.6 revving up and down

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  • kimd2057 Dec 27, 2008

    I have the a similar problem, I have a 1996 honda civic lx. Just been fixed from overheating. When in park, the engine revs up and down from 1 rpm to 2 rpm's. Any help or advice would be greatly appreciated. thanks.

  • bwood9191 Feb 28, 2009

    i am have the same problem i need to get it fixed, how much is this going to cost me?
    oh im driving a 93 civic dx

  • bwood9191 Feb 28, 2009

    ugh i have the same problem how much am i looking to get this fixed

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The most common cause of this is a air pocket in the cooling system, If you've done a coolant flush, changed a hose, radiator, etc..Im not saying that every honda that has a surging idle has this problem but I've worked at a honda dealership for over 10 years and I see this quite often. Let the car idle with the cap off for a while and if that still doesnt do it, jacking up the car as high as you can on the left side while its idling works too..theres a 25 tool thats basically just a funnel that stops this problem if you do alot of your own mechanical work.

Posted on Apr 26, 2009

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My 1993 Honda civic did the same.
There are five things you must check.
1: Make sure your throttle cable is not too tight. You should have 10 to 12 MM of slack when in idle.
Your car may have a different setting, but this is the factory SPEC for my Honda.
2: A bad EACV will cause this problem. It is that round cylinder behind the Throttle Body.
3: A bad Fast Idle Valve will also cause this. It is located under the Throttle Body.
This valve works like a thermostat, it needs hot water from the motor to operate.
4: Check all hot water hoses to the EACV and Fast Idle Valve. Make sure you have no clog.
These lines are small and look like Vacuum connections.
5: Check the (AIR IN) Port that it is not clogged. On my Car this is located inside the Throttle
Body before the butterfly valve on the left side. This air intake is used for the fast idle system.

My Cars problem was a clogged water line, check this first. As these hoses are small this could
be you fix.




Posted on Feb 14, 2009

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Lambda sensor in the exhaust or the airflow box..chances are its the Lambda sensor nearly 90% sure.

Posted on Dec 06, 2008

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You need an idle air control valve. It is located at the top of your intake manifold. It has a semi-round black plastic top on it. The rest is flatter, and seals up to your intake manifold. They run about 50 bucks used from a junk yard. NOTE: don't spray it out or try to de-gunk it. Just screw it on and go. Trying to deep clean these units typically causes failure.

Posted on Sep 20, 2012

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Check the iac valve.if the car over heats there is a plastic screw in the iac valve that backs itself out and that causes the car to have an irradic idle. had the same problem and tightened the screw and it worked fine

Posted on Apr 21, 2009

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SOURCE: 1997 honda civic 1.6 revving

well there could be couple problems happened to mine only cuz the troddle position sensor wasn't working properly. so while idling the rpms would go up and down then sometime shut off eventually. but when you mean rev up and down you mean idling irregular? if so your timing belt and or pulley's worn fuel pump not delievering enuff fuel to fuel injection system, leaking egr valve, or even the air filter clogged.

Posted on Dec 29, 2008

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SOURCE: 1997 honda civic 1.6 revving up and down

There is carbon built up in the egr...try getting the egr valve cleaned

Posted on Feb 19, 2009

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1997 honda civic 1.6 revving up and down


well there could be couple problems happened to mine only cuz the troddle position sensor wasn't working properly. so while idling the rpms would go up and down then sometime shut off eventually. but when you mean rev up and down you mean idling irregular? if so your timing belt and or pulley's worn fuel pump not delievering enuff fuel to fuel injection system, leaking egr valve, or even the air filter clogged.

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1997 honda civic 1.6 revving up and down


if the check engine light is on it probably the egr valve but if the light is not on the idle control solinoid is dirty or broken

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