Transmission screwed?? Sports light flashing, car stalling and not turning on, speedometer may or may not work, rev's too high or low, overheating coming through vents, temp gauge not working... whats wrong with it?? Its a Honda Accord 91 4WS

Your best bet , take it to a qualified repair shop. The overdrive off light flashes is telling you that the transmission has a problem an code's are set in the transmission control module or PCM - engine computer . Speedometer an odometer not working could mean speed sensor is bad . Checking code's with a factory or professional scan tool is need . The heater fan not turning off is a seperate problem , relay stuck closed maybe . Is it running at high speed ?

Bad Sleeves - Ford Servo Bore Transmission Fix Solution

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Original owner let it run low on fluid because of leak. ... The worn bores will cause slipping, hard shifts, and high revs between shifts from those gears. ..... Andy I bought a 02 mercury mountaineer v6 4.0 the the O/D flashes and service light is on ... Get on a flat surface at highway speeds and manually turn the OD of and on.

"O/D off" light blinking on dash? please help anyone? - Discussion ...

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The speedometer and odometer gets a signal from the speed sensor in the side of the transmission where the speedo cable once was.
The problem could be the speed sensor, or something in the wiring, or in the instrument cluster. Or it could be that the transmission is failing internally.

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Are you sure you replaced the speed sensor in the transmission ?
You could try unplugging the sensor to see if that affects the engine speed.
It sounds like you disconnected a vac hose or a wiring harness some where. A large vac leak would cause the engine to rev high and so could a wiring problem.

check your battery and alternator, this is fluctuating voltage causing th einstrument panel to go crazy!! Autozone can check it for you for free!!

the port is probably under your steering wheel, like above where your feet and legs sit. you need an OBD1 (on board diagnostic) scanner. Some places do it free, some charge, or you can buy the cheaper one at auto zone for like 50 bucks. or the nice one for like 300. call around and see who will do it for free :)

Your issue is a bad "speed sensor". Your speedometer is controlled by a sensor in your transmission, and when it quits working your speedometer will not work, it can cause very irregular shift patterns and slipping. Replacing your speed sensor should resolve your issues.

I hope this helps you, and I wish you luck on your repair.

the the throttle position sensor or transmission linkage may need to be adjusted to kick it into high idle when the air is turned on.