Question about 1993 Honda Accord

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91 accord rpm going up and down while car idleing

Ok so i have a 93 accord actually with a motor out of a 91 accord and when the car is first started up the rpm guage will go up to about 3,000 then down to 0 back up then down up then down untill car is warmed up just need to find a resoloution to this never happened on my old motor had in car buyt have had it happen on another accord and seen it on a few other accords as well never could find what was causing it

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  • mrzoot101 May 15, 2009

    once the heat guage starts moving up the issue does go away but turn the car off let sit for 5 mins or longer n turn car back on probleam is back engine light does not come on but did notice it showed up the engine light that is after driving for 10mins

  • Dan Todd May 11, 2010

    Go to your nearest Autozone and ask them to take their hand held meter out to hook up to your car and tell you what the code(s) is/are. Then we can go from there.



    Sirwriter

  • Dan Todd May 11, 2010

    So after the car warms up, the problem goes away? It does sound like an idle air control vavle problem except the idling should be erratic even after it wams up.



    Does the check engine light come on?

  • Dave  C
    Dave C May 11, 2010

    You have a big old vacuum leak. Hondas have a very common problem with PCV valve getting stuck open, replace it just because it's cheap maintenance. If that doesn't fix it, start hunting. Sometimes an aerosol can of carb cleaner sprayed in the suspect area will help you pinpoint it. A pair of needle nose pliers helps in clamping off suspect hoses, try the brake booster.

  • chino626 May 11, 2010

    i used to have this same problem too. the motor would rev to a certain rpm, then drop and all over again.. you might want to check your electrical circuit. i checked everything. i even replaced the idle control sensor but the problem didnt seem to go away. check the ground terminal and the connection to the chassis. that might do the trick.

  • blueextc3221
    blueextc3221 May 11, 2010

    egr valve sticking.

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It sounds like you have air in the cooling system, it doesn't take much air to get one of these engines to do this. Most people just fill these cars up with coolant and cap them off and that's what happens. The easiest way I found to remedy this is take the cap off the radiator when the car is cooled down, top the antifreeze up and put a drain pan under the radiator, because some will spill over, Then start the car and let it idle. You will probably notice it start to produce significant bubbles, just keep topping it off as the bubbles work there way out. Once the cooling fans come on the level will start dropping again. Slowly top off the radiator as the level drops and once the fans stop pop the radiator cap on and it should be fully bled out. I hope this helps.

Posted on May 19, 2009

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