S flashing on the dash of a 1990 honda accord, automatic transmission but it wont move very well in drive 4, it needs a new automatic transmission control until can i still drive it until I can afford to replace the unit

The transmission computer has most likely failed

The flashing s light means a transmission problem. The transmission computer is under the carpet on passenger side under where you put your feet. Pull down the carpet to see the diagnostic light. Turn on the key to count the flashes to get the code. Pulll a list of codes from the internet.
If your trans shifts properly if you manually shift it thru the gears, going from D1, D2 D3 but feels like it is starting in second when in drive at a stop, the computer is probably the issue, and can be repaired or exchanged for a good computer, lots of companies do this ,find 1 on the internet.

Check your transmission fluid level first before doing anything else, and also note the color of the fluid. If it's dark then it needs to be changed. If it's low, you should do a transmission fluid change and fill it with 2.6 quarts of Hobda ATF fluid

For Automatic transmission problem,click the link below:----Overdrive light in the dash blinks? http://repairhelpcenter.blogspot.com/2012/01/overdrive-light-in-dash-blinks.html
--------- Automatic transmission troubleshooting:----

http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html

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Automatic transmission shift lever issues?-------

http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html

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AUTOMATIC TRANSMISSION FLUID LEVEL? --

http://schematicsdiagram.blogspot.com/2011/07/how-to-check-automatic-transmission.html

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AUTOMATIC TRANSMISSION FLUID AND FILTER?

http://schematicsdiagram.blogspot.com/2011/07/how-to-change-automatic-transmission.html

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Transmission fault light on car dash?

http://schematicsdiagram.blogspot.com/2011/12/transmission-fault-light-on-car-dash.html

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Transmission shifting problem?

http://schematicsdiagram.blogspot.com/2012/01/transmission-shifting-problem-on-toyota.html

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Transmission Slips out of 2nd gear?

http://repairhelpcenter.blogspot.in/2012/02/transmission-slips-out-of-2nd-gear.html

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OD light flashing and transmission fluid leaking?

http://repairhelpcenter.blogspot.in/2012/02/od-light-flashing-and-transmission.html

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Why Transmission fluid leaks near radiator?

http://repairhelpcenter.blogspot.in/2012/02/transmission-fluid-leaks-near-radiator.html

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Transmission fluid leaking?

http://technoanswers.blogspot.in/2012/02/ford-windstar-transmission-fluid.html

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****** wont go in reverse?

http://technoanswers.blogspot.in/2012/02/dodge-neon-wont-go-in-reverse.html

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Automatic transmission will not go into reverse?

http://technoanswers.blogspot.in/2012/02/dodge-automatic-transmission-will-not.html

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Transmission is making buzzing noise?

http://technoanswers.blogspot.in/2012/02/transmission-is-making-buzzing-noise.html

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This will help.

Thanks.

You need a new transmission computer. They are a very common failure part, google: "honda tcm". It is located under the front passenger's floor board. Buy a new one off ebay or a rebuilder, not used, they are all bad.

it is on the top of the transmission. there is no tube so it is directly in the transmission case. it is black or red and on the front side of the top. let me know if you have any more question. good luck

Larry, you really need to take it to a trasnsmission shop and find out what the trouble codes are, but it seems as though you have a burned up transmission. Thanks and good luck with your repair.

you have a transmission fault the D4 light blinks to tell you that there is a transmission problem when the light is blinking the transmission computer put the transmission into limp home mode so it will not shift normally and you should try not to drive it very far when it gets to this stage you need to have the transmission codes check to pin point the problem

your drive shaft thats turning is mabe broke or your automatic 4x4 lockers could be bad

A green flashing "S" is similar to a check engine light. It is telling you that something in or on your transmission is not functioning correctly, such as the speed sensor or shift control solenoids. If it starts flashing and the speedometer stops working or the transmission shifts weird, take it to a mechanic.