Question about 1986 Toyota Corolla 2 Door

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1986 toyota deceleration problem

I have a 1986 Toyota Corolla 1.6 Litre, 5 speed manual. The car is like new and runs like a top as long as I am giving it gas. The problem is this - when I take my foot off the gas (decelerate) it bucks and farts, this problem disappears if I depress the clutch or give it gas. Its driving me nuts. Any suggestions??

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  • Seaden Jun 05, 2008

    Hi Benimur

    Thanks for the quick reply re 1986 Toyota Corolla deceleration problem. I should have been more specific. There is no backfiring whatsoever. When I decelerate the car bucks and surges, anything but a smooth deceleration. The problem goes away as long as I am driving steadily or accelerating, or the clutch is depressed. Sorry for the misinformation. Any other suggestions?? Thanks for your help!

    Seaden

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Hi,

If I understand your concern, you have backfiring when decelerating, if yes, a possibility is that your air/fuel ratio is too lean, there is too much air and/or too little fuel. This could also be brought about by using free breathing air filter (such as K & N) instead of the original air box/filter and no re-jetting/re-calibration done. Either that or the exhaust system has been modified or replaced with free flow, headers or sport tuned. If yes, then either the carbs have not been re-jet or the injector has not been re-calibrated. It may also require re-mapping of the ECU.

Depressing the clutch when decelerating disengages the load and therefore no engine breaking is happening.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jun 05, 2008

  • Louie  Role
    Louie Role Jun 05, 2008

    Hi again Seaden,

    Appreciate the clarification, additional information and the postback.

    Offhand, try checking the drivetrain with special attention to the universal joints. This page might shed additional info.


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