I recently did a tune up on my 1991 toyota camry. Won't start.

Needs a tune up! Try some new plugs and wires, new air filter and fuel filter. Is it the 2.2 litre?

Do a fault code test on the electonic engine control module. Here is how you do that.

hi sean.
see if this link helps you out.
1991 Toyota Camry Lost Power and now won start Google Search

i have a 91 camry Dx the radio and lights come on but the car won't start up i don't hear any clicking sound when i try to start the car up

check the fuel pressure with a gauge first before jumping to the fuel pump as being the problem.if it is the pump and the fuel level is below 3/4 of a tank you won`t have to drain the fuel tank,as it will be lighter to lower the tank to gain access to the pump.have you checked for spark at the plugs and inspected the condition of the plugs.does your car need a tune-up,is the air filter plugged up,how long has it been since the fuel filter has been changed,it may be plugged.

check fuel pressure regulator /on fuel rail

i would replace the o2 sensor, sounds like the ecm is goung to loop mode

I saw this DIY site on how to replace the fuel pump of the 1992 Toyota Camry. This solution can be used in all vehicle types.

http://www.automd.com/62/how-to-replace-a-fuel-pump/

check the fuel filter first to see if it is plugged pour some STP gas treatment with injector cleaner into the gas tank and also check the injectors if this helps then you will need to change the fuel filter

Glad to hear that you are up and running! Please feel free to call upon me at anytime. The graciousness of a FixYa rating for my assistance would be greatly appreciated.