Question about 1994 Geo Metro

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My "Check Engine" Light

I have a 1994 Geo Metro. Recently, the "Check Engine" light came on in my car. My mechanic tried checking the problem using two different computers but, the computers couldn't read out any data about my car. My mechanic said it was possible the "processor" in my car was bad. I've continued to drive my car for almost two weeks now with no problems with the light still on. (At one point, the light did go out for about a day but, came back on and has stayed on). What could this be?
Thanks!
Olivia

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You cannot check the codes in a metro at least not too many tech can thecheck engine light is only a light that comes on if a system or systems fail or malfunction and will cause the car to fail emissions on that old of a car the light will do no harm on but I do believe the only people who have the equipment to check is the Chevy Dealer
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Posted on Aug 09, 2008

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Trouble Code description


Code 46 is indeed the trouble code for the Idle Speed Controller which is that big black box thingy on your throttle body. A lot of Chilton-type manual books omit that code because the ISC isn't found on pre 94 Metros. The ISC is a computer controlled auto-adjuster for the engine idle.

An important note: code 46 is often caused by misadjusted distributor timing. As you probably know, timing affects the idle, and if improper timing moves the idle beyond the ISC's adjustment range, the check engine light will come on and diagnostics will return code 46.

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