Toyota wont start in wet weather

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

sounds like a timing or carb issue.There are few different things that could be going on.

I dont use this word much but im Assumeing that YOUR mechanic scanned the computer and checked the coolant sensor or other possible causes,Ive ran across this many times before so bare with me,Have your mechanic try a known good Airflow meter and dont forget to check the main airboot for rips,cracks or tears in the seams,gotta inspect all the areas where it is accordianed for flexibility,another one is moisture penetrating into the distributor cap,got more if ya need them hope this helped let me know have a good day Darrell

You need to have the ignition switch replaced. You can do it yourself, but you would need a manual to tell you how to take the steering column apart.

give every thing a good spray with WD40 that may help start her up,, its a bad idear to use a high presher water hose for cleaning your engine up,,
you just found out way that is! she will go again after she has dryed off again,,

You could be in big trouble if the engine turns over slowly when trying to start when engine is cold (not warmed up). Check the charge in your battery and connections to make sure they are clean. If they are ok and it still turns over slowly and does not start you may have major engine repairs due.

you might want to try drying out the distributor cap and the rotor.they get water in them and they wont start.

Replace the ignition coil under the distributor cap. What you have is a hairline crack in it, and, when it is damp, the spark arcs out of the crack to ground, no spark. This is a VERY common problem with older Camrys. Take the coil off, and look at it real closely. You will see black marks on it, from the crack. I am very sure that this will eliminate your problem. Thanks for choosing FixYa!

anne, it sounds to me like dampness in the ignition process, if the engine is turning over at the turn of the key,then check the rubber ring seal inside your distributer cap(thats the coloured plastic cap with all the leads to the spark plugs) if its perished or showing signs of distortion,replace the whole cap. if its seems ok then try starting your engine at night or at least grey dark,open the bonnet and watch for sparks coming from any of the HT leads ( cable like things) that go to the spark plugs.If present either spray with "sparkseal"(short term solution) or replace the leads.Try this and if it doesn,t solve it , get in touch ok?

Remove the distributor cap & examine the ignition ccoil under the rotor. Does it have any burnt spots or hairline cracks? If so, replace it. Also, replace the plug wires if you replace the coil, if they are more than 5 years old. Coil failures are a VERY common issue.