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Old 06-17-2019, 09:31 AM
aaronknutson aaronknutson is offline
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Default misfire issues

Hey guys I'm new to the forum and am in need of some pointers. I'm not overly familiar with the 4.7l motors in this truck and i just purchased one. it ran fine for 3 weeks and now the front 4 cylinders are not firing at all and it is throwing a code for injector number one open circuit. I have gone over the diagrams for fuel and ignition circuits and can't find anything that directly ties those 4 cylinders together on the wiring side. any and all help is greatly appreciated. thanks in advance.
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Old 06-17-2019, 02:58 PM
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What are the actual trouble codes that showed up ?
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Old 06-17-2019, 03:16 PM
aaronknutson aaronknutson is offline
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p0201 consistantly followed by p0300, p0301, p0302, and p0304 depending on how long i run it
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Old 06-17-2019, 05:24 PM
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P0201 Cylinder 1 Injector Circuit Malfunction

read for possible causes & solutions

Read more at: https://www.obd-codes.com/p0201

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p0300 is a generic code, it does not point to any particular cylinder, it just states that there is a misfire

p0301 indicates misfire on cylinder #1
p0302 indicates misfire on cylinder #2
p0304 indicates misfire on cylinder #4

With these 3, you need to check for

Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s) <-- check front sensor(s) with a heat gun, watch youtube videos
Faulty fuel injector
Running out of fuel
Burned exhaust valve
Poor compression
Faulty catalytic converter(s) <-- check exhaust for rotten egg smell
Defective computer


quick injector check

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