Question about 1987 Toyota Supra

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Idle problem, running very rich

Hi, I have a Non-torbo 87' supra and for some reason it just keeps reving up and down 500-1500 rpm. The exhaust burns my eyes so i suspect it running very lean. I'm not sure whats wrong. Also it has been sitting for a few years. What should I do?

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  • peege2 Oct 15, 2008

    Ya but what about it running to rich?

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It sounds like the throttle position sensor.

Posted on Oct 14, 2008

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The carburetor is running too rich and fouling the spark plug. The idle on this 7hp engine also surges up and down, and doesn't seem to rev up to peak rpm. There is no idle mixture screw to adjust.


Afew things to check first before you start playing with it is to take out the air filter if dirty replace it ,Chrck the exhaust and see if its carboned up if so burn it over a fire and then tap it to remove all black carbon Then check the carby again as all carbys have a mixture screw and a air vent screw and check the compression to make sure the plug is caused by
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Also check the engine breather pipe as a blocked pipe can cause the same thing.
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