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Old 09-04-2019, 02:16 AM   #1
SoCalSTEVE
 
Drives: 2012 Yaris SE
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Question 2012 Yaris SE Firing Order - Troubleshooting P0304 Code

Troubleshooting a P0304 code and wanted to verify the firing order is 1,3,4,2 with 1 being on the passenger side.

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Old 09-04-2019, 07:07 AM   #2
ex-x-fire
 
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Firing order & cylinder layout are two different things. #1 is near the belt & pulleys, #4 is at the opposite end.
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Old 09-04-2019, 09:21 AM   #3
thebarber
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agreed, cyl 4 is on the transmission side, cyl 1 on the passenger/belt side.

best thing to do is swap the coil pack from 4-3 and the injectors from 4-2. see if the misfire moves or stays. they you'll know whether the issue is the spark plug, coil pack, or injector.
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Old 09-04-2019, 04:40 PM   #4
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Thanks for the clarification and info!
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Old 09-04-2019, 07:28 PM   #5
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Looks like the code cleared for a bit, but now it’s back. Going to swap the coil pack first and see what it does.
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