Question about 1996 Mitsubishi Eclipse

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1996 eclipse surging problem

This car started surging a few days ago. It only does it when the car is ideling. It runs fine but at a little higher RPMs. What could this be?

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The 1st thing to do here is test the engine control computer for fault codes, if none are present then do the following to clean the automatic idle speed control valve and the throttle valve, they get sludged up and this causes stalling and idle surge among other issues. So before you do any parts replacing do the cleaning, it costs about $5 and 30 minutes of your time. Here is the procedure. My experience? 35 years as a dealer factory trained technican.

Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.

Posted on Nov 18, 2011

  • yadayada
    yadayada Nov 18, 2011

    You can get the computer fault code test run for free by any Autozone or Oriley auto parts store. Ask for an "OBD2" fault code scan.

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There are a number of things to check
1 map sencer- very important to check the vacuum line that runs from the inlet manifold to the sencer. if it thinks that the vacuum is too low it will richen the mixture (it thinks that you have your foot on the gas) a worn engine will also cause this

Posted on Feb 08, 2009

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