Question about 1998 Honda Accord

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1998 honda accord 2.3l terrible rough idle but give it gas and it will smooth out. did tune up plugs cap rotor wires checked firing order and timing marks. all cyl have 150 pounds compression

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  • scott_hatch May 05, 2010

    i did check vaccuum lines and there is no antifreeze leaking or fuel leakes

  • scott_hatch May 05, 2010

    do you think that it has plugged injectors is that why the additive

  • scott_hatch May 09, 2010

    Thank you for helping me with this it saved me a lot of time and aggrevation. I put the seafoam in and filled the tank full and within 15 minutes of driving it came out of the rough idle and drove great.

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Is the check engine light on? if so, that would be the first place to start. if no light, check the vacuum lines around the throttle body closely.

you did a tune up - did you change the fuel filter? i restricted fuel filter can cause symptoms like this. it is located on the firewall, slightly to the passenger side.

double check all the connections on your new spark plug wires - a not quite all the way connection will miss at idle, but once the rpm goes up, do does the ignition voltage, jumping a slight gap. pull the wires back off and put them back on, feel for the positive "click" as it connects.

check your coolant level. if it is low, it can cause air to contact the coolant temperature sensor, cause idle and other driveability problems.

failing these things, go over the areas you were working very closely, ensure that there were no other electrical connectors and such that were disconnected / disturbed / not quite plugged in all the way.

good luck!

Posted on May 06, 2010

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Hello. Good. Now got get two bottles of a gas additive called Seafoam. follow the directions on the bottles and add this product to the fuel. Once you run a half tank of fuel through the engine your rough idle should be fixed. Joe

Posted on May 05, 2010

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  • Master
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Did you check for intake manifold leaks, or other vacuum leaks in the system. Thats normally the cause of a rough idle on those cars. Use a smoke machine and you should be able to spot the leak properly.

Posted on May 05, 2010

  • Xander  Kravitz
    Xander Kravitz May 05, 2010

    vacuum leaks are not only indicated by fuel or antifreeze leaks, and sometimes the manifold gaskets can leak without visible signs, which is why you need the smoke to tell. dont listen to idiots with no experience on here telling you to add fuel injector cleaner which 9 out of 10 times causes fuel pump failure due to being more viscus then gasoline. I have over 14 years experience as an automotive Diagnostician, My day to day workings are finding problems other people and repair facilities could not. Aside from being toyota, honda and ASE certified diagnostician.

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