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      10-02-2025, 01:49 PM   #1
E13
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Misfire and IAT error

I replaced my plugs and coils about 50 miles ago, did some hard pulls with no issues. I just started my car up and got the following errors, wondering if anyone has any ideas on what it could be
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      10-02-2025, 02:27 PM   #2
E13
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After clearing the codes, I started the car up, and there was a backfire during the start up (never happened before). It was also a rougher idle than usual (I think). I went around the block and recorded a log of a bunch of stuff. The IAT started at 72, then slowly dropped to 68 after 4 minutes of driving. (Car was in the sun).
What other tests can I do?
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      10-02-2025, 11:45 PM   #3
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Update: IAT error is gone. Misfire is in 1, 3, and 5.

Here’s a data log, would love if someone could take a look. Happy to donate a coffee or 10mm or whatever’s needed for some feedback on it
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      10-03-2025, 01:12 PM   #4
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Quote:
Originally Posted by E13 View Post
Update: IAT error is gone. Misfire is in 1, 3, and 5.

Here’s a data log, would love if someone could take a look. Happy to donate a coffee or 10mm or whatever’s needed for some feedback on it
https://datazap.me/u/e13/misfire?log=0&data=4-14
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      10-03-2025, 11:50 PM   #5
GoRomeo
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Quote:
Originally Posted by E13 View Post
Update: IAT error is gone. Misfire is in 1, 3, and 5.

Here’s a data log, would love if someone could take a look. Happy to donate a coffee or 10mm or whatever’s needed for some feedback on it
Did you make sure you seated the top coil connectors al the way? Check your ground straps and wiring. Make sure all is well connected?
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      05-06-2026, 10:50 AM   #6
E13
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Late update: problem was the aluminum valve cover PCV
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