Starting issues when the weather is humid?

AL FRANKLIN

MEMBER
1997 TOYOTA RAV4
4 CYL
4WD
AUTOMATIC
200,000 MILES

As old as the car is, it runs well. There are no service lights on, and it passed state inspection a couple of months ago. But when it rains (or is particularly humid) it won't start. In dry weather it starts right up and has absolutely no problem. But in or after a rain it just turns over and over but won't catch - won't start. My garage (and mechanics) can't figure it out. Any advice?

Saturday, November 16th, 2024 AT 4:38 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
110,144 POSTS

Hi,

How long has it been since the vehicle was tuned with a new distributor cap, rotor, plug wires, and plugs? I ask because if moisture enters the distributor, it can prevent it from getting ignition spark. I attached a pic below of the cap/wires that I'm referring to.

Also, if it won't start, either ignition spark or fuel is not present. My guess at this point is ignition spark is missing. Here is a link that explains how to check for ignition spark. Do this when it won't start.

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Let me know what has been done so far.

Take care,

Joe

See pic below.

Image (Click to make bigger)

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Saturday, November 16th, 2024 AT 7:33 PM

AL FRANKLIN

MEMBER
2 POSTS

Thanks Joe. Honestly, I can't imagine why my mechanics haven't looked into this very basic remedy. I'll talk with them tomorrow and get this old buggy back on the road. Thank you!

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Sunday, November 17th, 2024 AT 8:49 AM

JACOBANDNICKOLAS

MECHANIC
110,144 POSTS

Hi,

It's possible that he has considered it. However, anything is possible. If you can, let me know what he says or if you have other questions.

Take care,

Joe

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Sunday, November 17th, 2024 AT 8:11 PM