Mifire issue

[mslym10]

When driving in heavy rain car will misfire.
Checked ignition coils and checked air induction system.
Any ideas what else it could be?
Cheers guys

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[robhep3]

How did you check the coils? Water on top of the coils (when it rains) can cause an otherwise operational coil to misfire through the side. On a dry day, run the car to operating temp, then use a spray bottle with tap water to spritz one coil at a time and then drive the car to load the coil. When the car starts to miss, replace the coil you just sprayed. What kind of mileage is on your EP?

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[mslym10]

I've just had a visual look to see any build up of water around the coils.
But recently I've driven over a large puddle on a dry day and it began to fault again started misfiring. I got out to see if any water has sprayed up into the engine bay, but the engine bay was dry. Would this indicate that it's something underneath? I should also mention that there is no engine light present when it faults nor is there any fault codes lodged.
Car has about 100,000ks

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[robhep3]

Does your car have a cold air intake installed? Water on the air filter or air inlet could cause a similar stumbling miss.

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[mslym10]

I have a grupppe m intake. But I've already swapped back to stock air box and still faulted in the rain.
I was thinking maybe and o2 sensors getting wet or something, but I still don't have any engine lights on.
Thanks for your help so far Rob

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