Losing 6 cylinders after extremely hot weather and/or after a wash??

Dear all
I have read so many threads about losing power (6 cylinders) because of an electrical problem.
Let me tell you what happened to me
Yesterday I was at a Palm Springs at 100+ degree weather, the car was running fine ( a bit hot during idle) the car was parked under the blazing sun while I was having lunch and when I restart it I had no power (the car revved up but no torque) it ran like that for like 5 mins or so and then suddenly the power came back. I am not sure if the hot weather has something to do with it. I have had cars that start doing weird things in extremely hot or extremely cold weather due to the electronics.

Then the car drove perfectly for 200 miles, when I get home I went to wash the car, I am very careful to not put so much water on the engine cover to prevent spillage inside.
After washing the car the car ran again with only 6 cylinders, this time stay like that for like 20 mins and shutting down the engine and restarting didn’t make a difference.
I parked my car and began reading threads about it, most people agree this behavior is due to an electrical mishap, (the fuse box or a bad connection somewhere) but I read this thread
https://www.ferrarichat.com/forum/threads/no-power-and-weird-behavior.441066/

And post 12 and 19 refer to a recent wash
“The reason I ask about a recent wash is water can get into the ignition wires into the coil modules under the metal triangle pieces on both pass and driv sides. I would pull the wires and make sure they are dry, clean and secured. If the TR runs on one bank, temp will go up.”


After reading this I restarted the car to see if the power could be back after these components might be dried already and to my surprise the car is running fine now

So my questions for the experts are the following:
1 is it possible that I lost one bank due to the extreme hot weather first and then to the car wash?,
2 are these cars that fragile to water?the coil modules the other thread makes reference to look very exposed to water due to the open panels (see pictures)
3 can I diagnose a fuse panel problem or bad connection if the problem is not present now??


Thank you very much in advance

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I started the car today from dead cold and it fired up right away with the whole 12 cylinders and the idle very steady.
Sometimes when I don’t use the car for several days the car needs to be cranked twice, and the idle is a bit erratic but it gets better when it warms up. Maybe I have experienced the same as you but I don’t know if the car is running on 6 cylinders because I am not moving (waiting the car to warm up) and by the time I move the car is fine.




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Yes I read several threads yesterday after restarting the engine and I checked today and both sides were producing fumes. The car start it right away with no hesitation so I knew the car was running properly with 12 cylinders


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And that is exactly why I am curious if this behavior could be weather or exposed to water related.
I had a cayenne turbo and used to do crazy stuff when the car was exposed to extreme temperatures. And the thread I read got me wondering about the car wash.

Do you know if a mechanic can pinpoint your issue if the car is running properly when you take the car to the shop??



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Thanks Joe but the car is running fine now!!! So please tell me what to do if ever happens again?
Yesterday when the car had no power I checked the exhaust and both of them were hot and according to me releasing fumes (not as easy to see as with a cold start start but still I could feel the flow)
Do both banks get connected at some point that they might share some of the exhaust flow? Or when one bank is off the exhaust should feel like the engine is off?


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Thanks I understand unplugging and cleaning the harness connectors is a good first step to prevent it to happen again. (At the end cleaning the harness will never hurt)
But my question is if this behavior is normal due to water and/or hot temperature, do I need to be very careful while washing the car and better not go out if I see rain coming?





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You just made me answer my own question. I have an Ansa exhaust so according to the picture I share one muffler for both sides( It is the version with catalytic converters even though I don’t have cats)
Then how can I know if a bank is down without driving the car. And which bank is it?
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Good idea, what about a stethoscope on the valve covers? Would you be able to hear the difference ?


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Because my car shares one muffler before the tail pipes, I touched the precats from a cold start and both of them got hot at the same time
My logic tells me that one side will be colder if the car is running on one bank only.
I will monitor it this way just to be sure every time I star the engine both banks are running.
I contacted Dave Helms yesterday, he told me that the wash is a possibility, I was very careful to not direct the water to the engine bay BUT I was not that careful when I washed the taillights from behind with the water pressure gun. So it is a big possibility that I put some moisture on the coil elements, and that is why the car is running fine now (after the coils dried)
But most of the time the culprits is the fuse panel.

Now my question is about the heat, it could be that earlier that day I lost the bank because my fuse panel, which never had problems before, was over sensitive to the extreme weather.

So I removed the 4 big white connectors to see which ones could be in bad shape.
The ones in red (P41 and P63) look pretty burnt, the one in yellow not that much (P44) and the one in blue (P33) is actually a cable that is installed directly into it.
Can someone please tell me what corresponds to each connector??
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The connectors in this order
Up left (great shape) P33 has a cable connected directly
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