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Fredrikrosen
Posted on Sunday, August 09, 2020 - 08:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hello.
I got a strange phenomenon today when driving my XB9S on the highway, i had been driving for about 80mph in 20 minutes when the engine suddenly misfired when i gave full throttle and the engine light flickered. I did press in the clutch and the engine reved nice. And when driving of the highway was everything ok. I know the plug wires rubber caps are cracked, can it be the reason? But i did only happen on the highway. 🤷🏼

I did check the system with ECMspy and did notice the AFV value had went from 115 to 135. The misfire did happen a few km from home so it might have gone high and not got back to normal value. 🤔

There was no fault codes.
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Teeps
Posted on Sunday, August 09, 2020 - 11:03 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Sounds like skip spark mode was activated.
That means the engine was getting too hot.
The ECM will skip a firing event for the rear cylinder.
My Ulysses would do this too, reducing speed will stop this routine.
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Fredrikrosen
Posted on Sunday, August 09, 2020 - 03:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I see, to hot already after like 25km at 130km/h sound risky. Ok, i got out on the highway after a 15-20 min ride on smaller roads and it is was very hot outside today. Anything i can do to reduce this happening? It was just for like 30 sec and then it was normal again.
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Teeps
Posted on Sunday, August 09, 2020 - 05:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Skip spark is normal to protect the engine from damage.

Installing a large capacity right side air scoop will help the most.
https://www.youtube.com/watch?v=8WXtk7Nl56c


Some of us here in U.S. have installed switches to run the fan at will.
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Fredrikrosen
Posted on Sunday, August 09, 2020 - 06:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Great, thanks for support. =)
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