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2.4L Performance Tech 16 valve 172 hp EcoTec with 162 lb-ft of torque

Random cylinder 4 misfire

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Old Feb 22, 2024 | 07:54 AM
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HB2
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Scanner was a pro unit of my Nissan master tech's; code was 0304, stated "Cyl 4 misfire; The numbers were given via the scanner while engine running. Plugs were original.
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Old Feb 22, 2024 | 09:15 AM
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RJ_RS_SS_350
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Plugs were original? On a nearly 20 year old car that you just bought? How can you be sure? Compression test is free and easy, the tool is usually available as a "loaner" from chain auto parts stores.
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Old Feb 22, 2024 | 09:52 AM
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I still don't know what those random numbers mean.

My bet is the valve timing system needs attention.
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Old Feb 22, 2024 | 10:04 AM
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This is quite the read. I need to take a pill and rest my head.
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Old Feb 23, 2024 | 07:33 AM
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The car had 94,000 miles on it. If it's compression, why doesn't it miss all the time? It may go two weeks and a couple hundred miles before it does it and restarting seems to eliminate the small miss.
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Old Feb 23, 2024 | 07:39 AM
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Hence the suspicion of the wire harness
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Old Feb 23, 2024 | 07:40 AM
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You know, I come on here for some help and information, not to be ridiculed as an idiot.
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Old Feb 23, 2024 | 07:40 AM
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How do you check the coil wiring?
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Old Feb 23, 2024 | 07:41 AM
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You said plugs were original, have you replaced the plugs?
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Old Feb 23, 2024 | 07:44 AM
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I meant I replaced them with the same number plugs (as found in the manual) at 95,000 miles and that they were original to the car when I changed them out, along with new coils from Auto Zone.
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