Cylinder one misfire

Anthonyurq12

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Andrew
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North Carolina
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2020 Toyota Supra
The other day I was driving my car and as soon as I got to a stop light the car starts shaking and idling really rough. I figured that this wasn’t normal so I pull over to my buddies place and he hooks up a reader to the car and it read “cylinder one misfire”. I then got my car towed to my mechanics shop and my first reaction was probably spark plugs or coil pack. After further diagnosing those both were not the issue. Anybody have an idea of what else it could be? My Supra only has 8k miles on it and it’s frustrating that this already happening. I also have a aftermarket intake, downpipe and tune.
 

YellowJacket

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Ernie
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Does it keep doing it? Or was it a one time thing? I guess that answer kinda determines the actions.

But without much information, I know if this was happening to me, my first gut reaction would be to check the intake to see if anything got loose causing a leak. An air leak can cause these things. I confess I haven't installed an intake on the Supra...But i have in many other cars...and sometimes if something isn't sealing correctly this can happen.
 

Thill444

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if your mechanic has it he should be checking for things like vacuum leaks, and things like compression testing. A cylinder misfire could be a ton if things, you need to narrow it down.
 
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