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Hello, klemon1155 and thank you for asking your question on Fixya!
Here is a simple process that will walk you through a few steps that
will pinpoint the overheating problem on your 1994 Geo Metro,
without even using any tools. It has helped millions of people, and I am
certain that it will help you, because I wrote it for people in your exact situation. How to diagnose your overheating 1994 Geo Metro
Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST. Shift suddenly become very hard. When going from park to either reverse or drive it slams into gear. 1-2 and 2-3 shifts are also harsh. All gears seems to work. Problem may be intermittent: Check TPS for smooth electrical response. If the response is jumpy or erratic at all, replace TPS. Thank you for using fixya and keep us posted.
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
Please give me a good rating if you found this information useful www.aceautomotive1.com
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.