My 89 acura legend wont start .All my gauges com on but when i turn the key nothing happens

Does it crank (turn over) and not start? Does it not crank? Try locking and unlocking the doors with the key.

I would check the system for leaks and low coolant and then if nothing is found replace the thermostat.

Sounds like the Starter. Easy to change and not too expensive. Just in case check your battery to see if it is fully charged, if not change the starter.

Main Relay solder connections are faulty and act up when the cabin temperature is hot.

That sounds like a dead battery. The ticking sound is the relay (a type of switch) which enables power to the starter motor when you turn the key. If the battery is weak, the relay will click, but there is not enough power to turn the starter motor.

assuming the engine run good and nothing wrong with it, check ignition relay, can get them from junk yard if need to replaced them and will cost you barely nothing. my guess would be your ignition switch, it tend to wear out over time and loose contact. the unit is not cheap to replace and is common to some vehicle over time, some has better luck than others; this part run some where around 340-350 bucks. you can try to take ignition unit apart and jump the wire to see if that the problems. ignitions switch is like a master switch, if it faulty, it will not turn anything on, it seems like the battery is dead or something is disconnected. try this first before you decide to take ignition column apart, the next time it wont start, try to jiggle, wiggle and play with ignition unit with the key is in it, turn they key back and forth, try until the car turn on or start and see if that work. you have to play with it for awhile, if its faulty, it will also be stubborn.

My 89 had a bad Main Relay located under the dash. I re-soldered the connections and put it back in and the fuel pump worked (listen for itwhen your S3 is out). There may be a bad ground causing the lights to go on and off (ECU?).

look for the wire that is on your exauhst that is where the sensor is! it shouldnt be very hard to replace it yourself.

you need the electrical part of the ignition switch this is a common problem on this model.

 john.  hi   I have a acura legend 89 . the problem is that when i turn the lights on the back lights wont turn on but  if i turn the switch back one turn they turn on ,   i did check the fuses and they are ok can any one help me???