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?
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Re: My "Check Engine" Light
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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There are usually only 3 wires to an alternator. The heavy red power output, a light field input, and the chassis ground.
There are about 20 different types of Geo Metro alternators, so I can't be sure, but I doubt your extra wire are for the alternator. Often a wiring harness will have all the possible wires, whether they are needed or not, such as AC, etc. Look at one in a used car lot or salvage yard.
dunno if it'll fix it- but check your pcv valve - 5$ for a new one - also check your egr valve- should be able to move depress it with your finger- if not, carb cleaner is safe to use to clean it up- remove it and clean it. this should help the idle
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.