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Re: 1991 toyota wont start in wet weather
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.
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As for the rough or slow cranking when you have wet weather it sounds like the starter brushes and or some other problems inside of the starter. You can pull that and take it to most parts stores and they can check it for you. As for the ignition problem I would say to go ahead and replace the wires and plugs as well making sure to by top of the line 8mm wires A/C Delco is a great brand. I don't know where you have been buying your caps and rotors but I have seen this problem happen when people buy these parts from AutoZone so if that is where you are getting yours I would recommend you go to Napa auto parts or Oreilys. And again buy only top of the line, it cost more but they last so much longer. Good luck.
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
To prove it when you have it running use a spray bottle and spray around the wires starting at the distributor and lastly spray the coil tower. do this late at night then you can see the sparks and see why it is so affected by wet situations.
The failure is a crack in the coil tower.
RECOMENTADTIONs listed below:
1. Replace coil.
2. Use a old oil wire and cut away the wire insulator and slide under the existing coil wire all the way to the base.
3. Use black electrical tape and neatly wrap the coil tower.
I would check the distributor cap first. Where I'm from in the great white north, the weather isn't usually humid enough to cause problems, but a number of my friends farther south have had the same issues with various vehicles.
i think you have a cracked distributor cap that is alowing the moisture to get inside of it. i would replace the cap. you can test this but beware if it is the cap the car will not start until all the moisture is dryed out of it. start the vehicle and spray just a fine spray of water on the cap if the vehicle acts up it is your cap or possible a plug wire
Take a look at the ignition system, most likely there are coils and ignition wires on this car, but don't quote me on it. However, this is very likely on a seventeen year old car.
Anyway, if the wires are more than four or five years old, it might be a good idea to replace them as moisture tends to get into the insulation and cause a misfire or stall. (I had this problem with my '89 Tracer and it drove me nuts). Another issue is check the ignition coils and make sure there are no cracks as these will less moisture in and cause a misfire.
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!