Question about 1986 Toyota Celica

3 Answers

Rough Idling and revs up and down

I have a 1986 2lt Toyota Celica Coupe which has a idling problem. It has the tendency to idle rough, and also has an intermittent problem with the revs going up and down. What could be the problem

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  • Hafi Abdeen May 01, 2010

    What is MAF/MAS, and which coild are you refering to?

  • Hafi Abdeen May 03, 2010

    Excessive pinging of motor, is it inter related to the present problem or how do I rectify same

  • Hafi Abdeen May 04, 2010

    Thanks for all the advise and info given. I have ordered the distributor cap, rotor, HT leads and spark plugs, and shall try this first. I have had this issue from the time I rebuilt the motor, and I believe the throttle body was replaced. But my gut feeling is, it could be the air flow sensor. Shall keep you posted with the progress. Other than this issue the vehicle performs very well. Thanks

  • Hafi Abdeen May 05, 2010

    Would you be good enough to send me a picture of the throttle body and air flow sensor, as I am not quite sure what it looks like. Thanks

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3 Answers

First thing to do is give it a complete tuneup and replace the spark plugs, spark plug wires, O2 sensor, distributor cap, rotor, and air filter. Next clean out the throttle body with some fuel injection spray cleaner. If this does not stop the rough idle problem then have your timing set to factory specs and replace your IAC valve (idle air control valve)

Posted on May 05, 2010

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  • Expert
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Hi! One thing can cause this. Your throttle body is faulty including the MAF (mass air flow) sensor thats why you are having idling problem. You will need to replace it to get your car back to normal running condition. Hope this helps and have a good one!

Posted on May 03, 2010

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  • Toyota Master
  • 1,619 Answers

When was the last tuneup? cap, rotor and coil? Fuel delivery cleaning, fuel filter? MAF/MAS? These are replacement items that need attention regularly.

Posted on May 01, 2010

  • Jason Johnson May 01, 2010

    Air flow sensors if applicable is what I was referring to but on that year you should not have them.

  • Jason Johnson May 04, 2010

    Bad timing or old ignition parts are most likely to blame also check all fluid levels.

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